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1baa385065
In #88217 a large set of matchers was changed to only accept poison values in splats, but not undef values. This is because we now use poison for non-demanded vector elements, and allowing undef can cause correctness issues. This patch covers the remaining matchers by changing the AllowUndef parameter of getSplatValue() to AllowPoison instead. We also carry out corresponding renames in matchers. As a followup, we may want to change the default for things like m_APInt to m_APIntAllowPoison (as this is much less risky when only allowing poison), but this change doesn't do that. There is one caveat here: We have a single place (X86FixupVectorConstants) which does require handling of vector splats with undefs. This is because this works on backend constant pool entries, which currently still use undef instead of poison for non-demanded elements (because SDAG as a whole does not have an explicit poison representation). As it's just the single use, I've open-coded a getSplatValueAllowUndef() helper there, to discourage use in any other places.
376 lines
14 KiB
LLVM
376 lines
14 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Canonicalize vector ge/le comparisons with constants to gt/lt.
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; Normal types are ConstantDataVectors. Test the constant values adjacent to the
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; min/max values that we're not allowed to transform.
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define <2 x i1> @sge(<2 x i8> %x) {
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; CHECK-LABEL: @sge(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 -128, i8 126>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sge <2 x i8> %x, <i8 -127, i8 -129>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @uge(<2 x i8> %x) {
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; CHECK-LABEL: @uge(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 -2, i8 0>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp uge <2 x i8> %x, <i8 -1, i8 1>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @sle(<2 x i8> %x) {
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; CHECK-LABEL: @sle(
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> [[X:%.*]], <i8 127, i8 -127>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sle <2 x i8> %x, <i8 126, i8 128>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @ule(<2 x i8> %x) {
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; CHECK-LABEL: @ule(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 -1, i8 1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp ule <2 x i8> %x, <i8 254, i8 0>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @ult_min_signed_value(<2 x i8> %x) {
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; CHECK-LABEL: @ult_min_signed_value(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp ult <2 x i8> %x, <i8 128, i8 128>
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ret <2 x i1> %cmp
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}
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; Zeros are special: they're ConstantAggregateZero.
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define <2 x i1> @sge_zero(<2 x i8> %x) {
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; CHECK-LABEL: @sge_zero(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sge <2 x i8> %x, <i8 0, i8 0>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @uge_zero(<2 x i8> %x) {
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; CHECK-LABEL: @uge_zero(
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; CHECK-NEXT: ret <2 x i1> <i1 true, i1 true>
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;
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%cmp = icmp uge <2 x i8> %x, <i8 0, i8 0>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @sle_zero(<2 x i8> %x) {
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; CHECK-LABEL: @sle_zero(
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> [[X:%.*]], <i8 1, i8 1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sle <2 x i8> %x, <i8 0, i8 0>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @ule_zero(<2 x i8> %x) {
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; CHECK-LABEL: @ule_zero(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp ule <2 x i8> %x, <i8 0, i8 0>
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ret <2 x i1> %cmp
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}
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; Weird types are ConstantVectors, not ConstantDataVectors. For an i3 type:
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; Signed min = -4
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; Unsigned min = 0
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; Signed max = 3
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; Unsigned max = 7
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define <3 x i1> @sge_weird(<3 x i3> %x) {
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; CHECK-LABEL: @sge_weird(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <3 x i3> [[X:%.*]], <i3 -4, i3 2, i3 -1>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp sge <3 x i3> %x, <i3 -3, i3 -5, i3 0>
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ret <3 x i1> %cmp
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}
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define <3 x i1> @uge_weird(<3 x i3> %x) {
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; CHECK-LABEL: @uge_weird(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ugt <3 x i3> [[X:%.*]], <i3 -2, i3 0, i3 1>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp uge <3 x i3> %x, <i3 -1, i3 1, i3 2>
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ret <3 x i1> %cmp
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}
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define <3 x i1> @sle_weird(<3 x i3> %x) {
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; CHECK-LABEL: @sle_weird(
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <3 x i3> [[X:%.*]], <i3 3, i3 -3, i3 1>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp sle <3 x i3> %x, <i3 2, i3 4, i3 0>
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ret <3 x i1> %cmp
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}
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define <3 x i1> @ule_weird(<3 x i3> %x) {
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; CHECK-LABEL: @ule_weird(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult <3 x i3> [[X:%.*]], <i3 -1, i3 1, i3 2>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp ule <3 x i3> %x, <i3 6, i3 0, i3 1>
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ret <3 x i1> %cmp
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}
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; We can't do the transform if any constants are already at the limits.
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define <2 x i1> @sge_min(<2 x i3> %x) {
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; CHECK-LABEL: @sge_min(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sge <2 x i3> [[X:%.*]], <i3 -4, i3 1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sge <2 x i3> %x, <i3 -4, i3 1>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @uge_min(<2 x i3> %x) {
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; CHECK-LABEL: @uge_min(
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; CHECK-NEXT: [[CMP:%.*]] = icmp uge <2 x i3> [[X:%.*]], <i3 1, i3 0>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp uge <2 x i3> %x, <i3 1, i3 0>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @sle_max(<2 x i3> %x) {
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; CHECK-LABEL: @sle_max(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sle <2 x i3> [[X:%.*]], <i3 1, i3 3>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sle <2 x i3> %x, <i3 1, i3 3>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @ule_max(<2 x i3> %x) {
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; CHECK-LABEL: @ule_max(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ule <2 x i3> [[X:%.*]], <i3 -1, i3 1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp ule <2 x i3> %x, <i3 7, i3 1>
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ret <2 x i1> %cmp
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}
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define <2 x i1> @PR27756_1(<2 x i8> %a) {
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; CHECK-LABEL: @PR27756_1(
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> [[A:%.*]], <i8 34, i8 1>
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sle <2 x i8> %a, <i8 bitcast (<2 x i4> <i4 1, i4 2> to i8), i8 0>
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ret <2 x i1> %cmp
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}
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; Undef elements don't prevent the transform of the comparison.
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define <3 x i1> @PR27756_2(<3 x i8> %a) {
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; CHECK-LABEL: @PR27756_2(
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <3 x i8> [[A:%.*]], <i8 43, i8 43, i8 1>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp sle <3 x i8> %a, <i8 42, i8 poison, i8 0>
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ret <3 x i1> %cmp
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}
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define <3 x i1> @PR27756_3(<3 x i8> %a) {
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; CHECK-LABEL: @PR27756_3(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <3 x i8> [[A:%.*]], <i8 0, i8 0, i8 41>
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; CHECK-NEXT: ret <3 x i1> [[CMP]]
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;
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%cmp = icmp sge <3 x i8> %a, <i8 poison, i8 1, i8 42>
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ret <3 x i1> %cmp
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}
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@someglobal = global i32 0
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define <2 x i1> @PR27786(<2 x i8> %a) {
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; CHECK-LABEL: @PR27786(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sle <2 x i8> [[A:%.*]], bitcast (i16 ptrtoint (ptr @someglobal to i16) to <2 x i8>)
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%cmp = icmp sle <2 x i8> %a, bitcast (i16 ptrtoint (ptr @someglobal to i16) to <2 x i8>)
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ret <2 x i1> %cmp
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}
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; This is similar to a transform for shuffled binops: compare first, shuffle after.
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define <4 x i1> @same_shuffle_inputs_icmp(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @same_shuffle_inputs_icmp(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <4 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <4 x i32> <i32 3, i32 3, i32 2, i32 0>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%shufx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> < i32 3, i32 3, i32 2, i32 0 >
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%shufy = shufflevector <4 x i8> %y, <4 x i8> poison, <4 x i32> < i32 3, i32 3, i32 2, i32 0 >
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%cmp = icmp sgt <4 x i8> %shufx, %shufy
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ret <4 x i1> %cmp
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}
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; fcmp and size-changing shuffles are ok too.
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define <5 x i1> @same_shuffle_inputs_fcmp(<4 x float> %x, <4 x float> %y) {
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; CHECK-LABEL: @same_shuffle_inputs_fcmp(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp oeq <4 x float> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <5 x i32> <i32 0, i32 1, i32 3, i32 2, i32 0>
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; CHECK-NEXT: ret <5 x i1> [[CMP]]
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;
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%shufx = shufflevector <4 x float> %x, <4 x float> poison, <5 x i32> < i32 0, i32 1, i32 3, i32 2, i32 0 >
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%shufy = shufflevector <4 x float> %y, <4 x float> poison, <5 x i32> < i32 0, i32 1, i32 3, i32 2, i32 0 >
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%cmp = fcmp oeq <5 x float> %shufx, %shufy
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ret <5 x i1> %cmp
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}
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declare void @use_v4i8(<4 x i8>)
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define <4 x i1> @same_shuffle_inputs_icmp_extra_use1(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @same_shuffle_inputs_icmp_extra_use1(
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; CHECK-NEXT: [[SHUFX:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <4 x i8> [[X]], [[Y:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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; CHECK-NEXT: call void @use_v4i8(<4 x i8> [[SHUFX]])
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%shufx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> < i32 3, i32 3, i32 3, i32 3 >
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%shufy = shufflevector <4 x i8> %y, <4 x i8> poison, <4 x i32> < i32 3, i32 3, i32 3, i32 3 >
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%cmp = icmp ugt <4 x i8> %shufx, %shufy
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call void @use_v4i8(<4 x i8> %shufx)
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ret <4 x i1> %cmp
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}
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declare void @use_v2i8(<2 x i8>)
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define <2 x i1> @same_shuffle_inputs_icmp_extra_use2(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @same_shuffle_inputs_icmp_extra_use2(
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; CHECK-NEXT: [[SHUFY:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <2 x i32> <i32 3, i32 2>
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <4 x i8> [[X:%.*]], [[Y]]
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <2 x i32> <i32 3, i32 2>
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; CHECK-NEXT: call void @use_v2i8(<2 x i8> [[SHUFY]])
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%shufx = shufflevector <4 x i8> %x, <4 x i8> poison, <2 x i32> < i32 3, i32 2 >
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%shufy = shufflevector <4 x i8> %y, <4 x i8> poison, <2 x i32> < i32 3, i32 2 >
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%cmp = icmp eq <2 x i8> %shufx, %shufy
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call void @use_v2i8(<2 x i8> %shufy)
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ret <2 x i1> %cmp
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}
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; Negative test: if both shuffles have extra uses, don't transform because that would increase instruction count.
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define <2 x i1> @same_shuffle_inputs_icmp_extra_use3(<4 x i8> %x, <4 x i8> %y) {
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; CHECK-LABEL: @same_shuffle_inputs_icmp_extra_use3(
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; CHECK-NEXT: [[SHUFX:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[SHUFY:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq <2 x i8> [[SHUFX]], [[SHUFY]]
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; CHECK-NEXT: call void @use_v2i8(<2 x i8> [[SHUFX]])
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; CHECK-NEXT: call void @use_v2i8(<2 x i8> [[SHUFY]])
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; CHECK-NEXT: ret <2 x i1> [[CMP]]
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;
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%shufx = shufflevector <4 x i8> %x, <4 x i8> poison, <2 x i32> < i32 0, i32 0 >
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%shufy = shufflevector <4 x i8> %y, <4 x i8> poison, <2 x i32> < i32 0, i32 0 >
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%cmp = icmp eq <2 x i8> %shufx, %shufy
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call void @use_v2i8(<2 x i8> %shufx)
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call void @use_v2i8(<2 x i8> %shufy)
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ret <2 x i1> %cmp
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}
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define <4 x i1> @splat_icmp(<4 x i8> %x) {
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; CHECK-LABEL: @splat_icmp(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <4 x i8> [[X:%.*]], <i8 42, i8 42, i8 42, i8 42>
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%splatx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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%cmp = icmp sgt <4 x i8> %splatx, <i8 42, i8 42, i8 42, i8 42>
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ret <4 x i1> %cmp
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}
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define <4 x i1> @splat_icmp_poison(<4 x i8> %x) {
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; CHECK-LABEL: @splat_icmp_poison(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <4 x i8> [[X:%.*]], <i8 42, i8 42, i8 42, i8 42>
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <4 x i1> [[TMP1]], <4 x i1> poison, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%splatx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 2, i32 poison, i32 poison, i32 2>
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%cmp = icmp ult <4 x i8> %splatx, <i8 poison, i8 42, i8 poison, i8 42>
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ret <4 x i1> %cmp
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}
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define <4 x i1> @splat_icmp_larger_size(<2 x i8> %x) {
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; CHECK-LABEL: @splat_icmp_larger_size(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 42, i8 42>
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <2 x i1> [[TMP1]], <2 x i1> poison, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%splatx = shufflevector <2 x i8> %x, <2 x i8> poison, <4 x i32> <i32 1, i32 poison, i32 1, i32 poison>
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%cmp = icmp eq <4 x i8> %splatx, <i8 42, i8 42, i8 poison, i8 42>
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ret <4 x i1> %cmp
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}
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define <4 x i1> @splat_fcmp_smaller_size(<5 x float> %x) {
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; CHECK-LABEL: @splat_fcmp_smaller_size(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp oeq <5 x float> [[X:%.*]], <float 4.200000e+01, float 4.200000e+01, float 4.200000e+01, float 4.200000e+01, float 4.200000e+01>
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; CHECK-NEXT: [[CMP:%.*]] = shufflevector <5 x i1> [[TMP1]], <5 x i1> poison, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%splatx = shufflevector <5 x float> %x, <5 x float> poison, <4 x i32> <i32 1, i32 poison, i32 1, i32 poison>
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%cmp = fcmp oeq <4 x float> %splatx, <float 42.0, float 42.0, float poison, float 42.0>
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ret <4 x i1> %cmp
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}
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; Negative test
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|
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define <4 x i1> @splat_icmp_extra_use(<4 x i8> %x) {
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; CHECK-LABEL: @splat_icmp_extra_use(
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; CHECK-NEXT: [[SPLATX:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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; CHECK-NEXT: call void @use_v4i8(<4 x i8> [[SPLATX]])
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <4 x i8> [[SPLATX]], <i8 42, i8 42, i8 42, i8 42>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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;
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%splatx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
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call void @use_v4i8(<4 x i8> %splatx)
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%cmp = icmp sgt <4 x i8> %splatx, <i8 42, i8 42, i8 42, i8 42>
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ret <4 x i1> %cmp
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}
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|
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; Negative test
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|
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define <4 x i1> @not_splat_icmp(<4 x i8> %x) {
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; CHECK-LABEL: @not_splat_icmp(
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; CHECK-NEXT: [[SPLATX:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 3, i32 3>
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|
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <4 x i8> [[SPLATX]], <i8 42, i8 42, i8 42, i8 42>
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; CHECK-NEXT: ret <4 x i1> [[CMP]]
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|
;
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|
%splatx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 3, i32 3>
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%cmp = icmp sgt <4 x i8> %splatx, <i8 42, i8 42, i8 42, i8 42>
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|
ret <4 x i1> %cmp
|
|
}
|
|
|
|
; Negative test
|
|
|
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define <4 x i1> @not_splat_icmp2(<4 x i8> %x) {
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|
; CHECK-LABEL: @not_splat_icmp2(
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|
; CHECK-NEXT: [[SPLATX:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
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|
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <4 x i8> [[SPLATX]], <i8 43, i8 42, i8 42, i8 42>
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|
; CHECK-NEXT: ret <4 x i1> [[CMP]]
|
|
;
|
|
%splatx = shufflevector <4 x i8> %x, <4 x i8> poison, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
|
|
%cmp = icmp sgt <4 x i8> %splatx, <i8 43, i8 42, i8 42, i8 42>
|
|
ret <4 x i1> %cmp
|
|
}
|