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[IR] Look through bitcast in hasFnAttribute()

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A logic incompleteness may lead MemorySSA to be too conservative
in its results. Specifically, when dealing with a call of kind
`call i32 bitcast (i1 (i1)* @test to i32 (i32)*)(i32 %1)`, where
the function `test` is declared with readonly attribute, the
bitcast is not looked through, obscuring function attributes. Hence,
some methods of CallBase (e.g., doesNotReadMemory) could provide
suboptimal results.

Differential Revision: https://reviews.llvm.org/D109888
This commit is contained in:
Antonio Frighetto 2021-09-21 21:54:40 +02:00 committed by Nikita Popov
parent 248342b7c7
commit 43d6991c2a
5 changed files with 178 additions and 69 deletions
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16
llvm/lib/IR/Instructions.cpp
View File

@ -349,14 +349,26 @@ bool CallBase::paramHasAttr(unsigned ArgNo, Attribute::AttrKind Kind) const {
}
bool CallBase::hasFnAttrOnCalledFunction(Attribute::AttrKind Kind) const {
if (const Function *F = getCalledFunction())
Value *V = getCalledOperand();
if (auto *CE = dyn_cast<ConstantExpr>(V))
if (CE->getOpcode() == BitCast)
V = CE->getOperand(0);
if (auto *F = dyn_cast<Function>(V))
return F->getAttributes().hasFnAttr(Kind);
return false;
}
bool CallBase::hasFnAttrOnCalledFunction(StringRef Kind) const {
if (const Function *F = getCalledFunction())
Value *V = getCalledOperand();
if (auto *CE = dyn_cast<ConstantExpr>(V))
if (CE->getOpcode() == BitCast)
V = CE->getOperand(0);
if (auto *F = dyn_cast<Function>(V))
return F->getAttributes().hasFnAttr(Kind);
return false;
}

14
llvm/test/Analysis/MemorySSA/call-bitcast.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
;
; Ensures that MemorySSA leverages the ground truth of the function being called when wrapped in a bitcast.
declare i1 @opaque_true(i1) nounwind readonly
define i1 @foo(i32* %ptr, i1 %cond) {
%cond_wide = zext i1 %cond to i32
; CHECK: MemoryUse(liveOnEntry) MayAlias
; CHECK-NEXT: call i32 bitcast
%cond_hidden_wide = call i32 bitcast (i1 (i1)* @opaque_true to i32 (i32)*)(i32 %cond_wide)
%cond_hidden = trunc i32 %cond_hidden_wide to i1
ret i1 %cond_hidden
}

105
llvm/test/Transforms/Attributor/IPConstantProp/arg-count-mismatch.ll
View File

@ -36,10 +36,16 @@
; FIXME we should recognize this as UB and make it an unreachable.
define dso_local i16 @foo(i16 %a) {
; CHECK-LABEL: define {{[^@]+}}@foo
; CHECK-SAME: (i16 [[A:%.*]]) {
; CHECK-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16)*)(i16 [[A]])
; CHECK-NEXT: ret i16 [[CALL]]
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@foo
; NOT_CGSCC_NPM-SAME: (i16 [[A:%.*]]) {
; NOT_CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16)*)(i16 [[A]])
; NOT_CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@foo
; IS__CGSCC_NPM-SAME: (i16 [[A:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16)*)(i16 [[A]])
; IS__CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
%call = call i16 bitcast (i16 (i16, i16) * @bar to i16 (i16) *)(i16 %a)
ret i16 %call
@ -51,19 +57,30 @@ define internal i16 @bar(i16 %p1, i16 %p2) {
; IS__TUNIT____-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__TUNIT____-NEXT: ret i16 0
;
; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@bar
; IS__CGSCC____-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC____-NEXT: ret i16 0
; IS__CGSCC_OPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_OPM-LABEL: define {{[^@]+}}@bar
; IS__CGSCC_OPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC_OPM-NEXT: ret i16 0
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@bar
; IS__CGSCC_NPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR1:[0-9]+]] {
; IS__CGSCC_NPM-NEXT: ret i16 0
;
ret i16 0
}
define dso_local i16 @foo2(i16 %a) {
; CHECK-LABEL: define {{[^@]+}}@foo2
; CHECK-SAME: (i16 [[A:%.*]]) {
; CHECK-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar2 to i16 (i16)*)(i16 [[A]])
; CHECK-NEXT: ret i16 [[CALL]]
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@foo2
; NOT_CGSCC_NPM-SAME: (i16 [[A:%.*]]) {
; NOT_CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar2 to i16 (i16)*)(i16 [[A]])
; NOT_CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@foo2
; IS__CGSCC_NPM-SAME: (i16 [[A:%.*]]) #[[ATTR0]] {
; IS__CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar2 to i16 (i16)*)(i16 [[A]])
; IS__CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
%call = call i16 bitcast (i16 (i16, i16) * @bar2 to i16 (i16) *)(i16 %a)
ret i16 %call
@ -76,11 +93,17 @@ define internal i16 @bar2(i16 %p1, i16 %p2) {
; IS__TUNIT____-NEXT: [[A:%.*]] = add i16 [[P1]], [[P2]]
; IS__TUNIT____-NEXT: ret i16 [[A]]
;
; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@bar2
; IS__CGSCC____-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR0]] {
; IS__CGSCC____-NEXT: [[A:%.*]] = add i16 [[P1]], [[P2]]
; IS__CGSCC____-NEXT: ret i16 [[A]]
; IS__CGSCC_OPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_OPM-LABEL: define {{[^@]+}}@bar2
; IS__CGSCC_OPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR0]] {
; IS__CGSCC_OPM-NEXT: [[A:%.*]] = add i16 [[P1]], [[P2]]
; IS__CGSCC_OPM-NEXT: ret i16 [[A]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@bar2
; IS__CGSCC_NPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]]) #[[ATTR1]] {
; IS__CGSCC_NPM-NEXT: [[A:%.*]] = add i16 [[P1]], [[P2]]
; IS__CGSCC_NPM-NEXT: ret i16 [[A]]
;
%a = add i16 %p1, %p2
ret i16 %a
@ -93,11 +116,18 @@ define internal i16 @bar2(i16 %p1, i16 %p2) {
; been provided),
define dso_local i16 @vararg_tests(i16 %a) {
; CHECK-LABEL: define {{[^@]+}}@vararg_tests
; CHECK-SAME: (i16 [[A:%.*]]) {
; CHECK-NEXT: [[CALL2:%.*]] = call i16 bitcast (i16 (i16, i16, ...)* @vararg_no_prop to i16 (i16)*)(i16 noundef 7)
; CHECK-NEXT: [[ADD:%.*]] = add i16 7, [[CALL2]]
; CHECK-NEXT: ret i16 [[ADD]]
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@vararg_tests
; NOT_CGSCC_NPM-SAME: (i16 [[A:%.*]]) {
; NOT_CGSCC_NPM-NEXT: [[CALL2:%.*]] = call i16 bitcast (i16 (i16, i16, ...)* @vararg_no_prop to i16 (i16)*)(i16 noundef 7)
; NOT_CGSCC_NPM-NEXT: [[ADD:%.*]] = add i16 7, [[CALL2]]
; NOT_CGSCC_NPM-NEXT: ret i16 [[ADD]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@vararg_tests
; IS__CGSCC_NPM-SAME: (i16 [[A:%.*]]) #[[ATTR0]] {
; IS__CGSCC_NPM-NEXT: [[CALL2:%.*]] = call i16 bitcast (i16 (i16, i16, ...)* @vararg_no_prop to i16 (i16)*)(i16 noundef 7)
; IS__CGSCC_NPM-NEXT: [[ADD:%.*]] = add i16 7, [[CALL2]]
; IS__CGSCC_NPM-NEXT: ret i16 [[ADD]]
;
%call1 = call i16 (i16, ...) @vararg_prop(i16 7, i16 8, i16 %a)
%call2 = call i16 bitcast (i16 (i16, i16, ...) * @vararg_no_prop to i16 (i16) *) (i16 7)
@ -106,10 +136,15 @@ define dso_local i16 @vararg_tests(i16 %a) {
}
define internal i16 @vararg_prop(i16 %p1, ...) {
; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@vararg_prop
; IS__CGSCC____-SAME: (i16 [[P1:%.*]], ...) #[[ATTR0]] {
; IS__CGSCC____-NEXT: ret i16 undef
; IS__CGSCC_OPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_OPM-LABEL: define {{[^@]+}}@vararg_prop
; IS__CGSCC_OPM-SAME: (i16 [[P1:%.*]], ...) #[[ATTR0]] {
; IS__CGSCC_OPM-NEXT: ret i16 undef
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@vararg_prop
; IS__CGSCC_NPM-SAME: (i16 [[P1:%.*]], ...) #[[ATTR1]] {
; IS__CGSCC_NPM-NEXT: ret i16 undef
;
ret i16 %p1
}
@ -120,10 +155,15 @@ define internal i16 @vararg_no_prop(i16 %p1, i16 %p2, ...) {
; IS__TUNIT____-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]], ...) #[[ATTR0]] {
; IS__TUNIT____-NEXT: ret i16 7
;
; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@vararg_no_prop
; IS__CGSCC____-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]], ...) #[[ATTR0]] {
; IS__CGSCC____-NEXT: ret i16 7
; IS__CGSCC_OPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_OPM-LABEL: define {{[^@]+}}@vararg_no_prop
; IS__CGSCC_OPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]], ...) #[[ATTR0]] {
; IS__CGSCC_OPM-NEXT: ret i16 7
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@vararg_no_prop
; IS__CGSCC_NPM-SAME: (i16 [[P1:%.*]], i16 [[P2:%.*]], ...) #[[ATTR1]] {
; IS__CGSCC_NPM-NEXT: ret i16 7
;
ret i16 %p1
}
@ -131,5 +171,8 @@ define internal i16 @vararg_no_prop(i16 %p1, i16 %p2, ...) {
;.
; IS__TUNIT____: attributes #[[ATTR0]] = { nofree nosync nounwind readnone willreturn }
;.
; IS__CGSCC____: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone willreturn }
; IS__CGSCC_OPM: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone willreturn }
;.
; IS__CGSCC_NPM: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone }
; IS__CGSCC_NPM: attributes #[[ATTR1]] = { nofree norecurse nosync nounwind readnone willreturn }
;.

32
llvm/test/Transforms/Attributor/IPConstantProp/arg-type-mismatch.ll
View File

@ -8,10 +8,16 @@
; argument type between the caller and callee.
define dso_local i16 @foo(i16 %a) {
; CHECK-LABEL: define {{[^@]+}}@foo
; CHECK-SAME: (i16 [[A:%.*]]) {
; CHECK-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16, i32)*)(i16 [[A]], i32 7)
; CHECK-NEXT: ret i16 [[CALL]]
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@foo
; NOT_CGSCC_NPM-SAME: (i16 [[A:%.*]]) {
; NOT_CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16, i32)*)(i16 [[A]], i32 7)
; NOT_CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@foo
; IS__CGSCC_NPM-SAME: (i16 [[A:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC_NPM-NEXT: [[CALL:%.*]] = call i16 bitcast (i16 (i16, i16)* @bar to i16 (i16, i32)*)(i16 [[A]], i32 7)
; IS__CGSCC_NPM-NEXT: ret i16 [[CALL]]
;
%call = call i16 bitcast (i16 (i16, i16) * @bar to i16 (i16, i32) *)(i16 %a, i32 7)
ret i16 %call
@ -23,10 +29,15 @@ define internal i16 @bar(i16 %p1, i16 %p2) {
; IS__TUNIT____-SAME: (i16 [[P1:%.*]], i16 returned [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__TUNIT____-NEXT: ret i16 [[P2]]
;
; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC____-LABEL: define {{[^@]+}}@bar
; IS__CGSCC____-SAME: (i16 [[P1:%.*]], i16 returned [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC____-NEXT: ret i16 [[P2]]
; IS__CGSCC_OPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_OPM-LABEL: define {{[^@]+}}@bar
; IS__CGSCC_OPM-SAME: (i16 [[P1:%.*]], i16 returned [[P2:%.*]]) #[[ATTR0:[0-9]+]] {
; IS__CGSCC_OPM-NEXT: ret i16 [[P2]]
;
; IS__CGSCC_NPM: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
; IS__CGSCC_NPM-LABEL: define {{[^@]+}}@bar
; IS__CGSCC_NPM-SAME: (i16 [[P1:%.*]], i16 returned [[P2:%.*]]) #[[ATTR1:[0-9]+]] {
; IS__CGSCC_NPM-NEXT: ret i16 [[P2]]
;
ret i16 %p2
}
@ -35,5 +46,8 @@ define internal i16 @bar(i16 %p1, i16 %p2) {
;.
; IS__TUNIT____: attributes #[[ATTR0]] = { nofree nosync nounwind readnone willreturn }
;.
; IS__CGSCC____: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone willreturn }
; IS__CGSCC_OPM: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone willreturn }
;.
; IS__CGSCC_NPM: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind readnone }
; IS__CGSCC_NPM: attributes #[[ATTR1]] = { nofree norecurse nosync nounwind readnone willreturn }
;.

80
llvm/test/Transforms/Attributor/liveness.ll
View File

@ -2473,33 +2473,59 @@ indirectgoto: ; preds = %lab0, %entry
@e = global %struct.a* null
define i32 @main() {
; CHECK-LABEL: define {{[^@]+}}@main() {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[F:%.*]] = alloca i32, align 4
; CHECK-NEXT: br label [[FOR_COND_0:%.*]]
; CHECK: for.cond.0:
; CHECK-NEXT: [[G_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY_0:%.*]] ]
; CHECK-NEXT: [[CMP_0:%.*]] = icmp ult i32 [[G_0]], 100
; CHECK-NEXT: br i1 [[CMP_0]], label [[FOR_BODY_0]], label [[FOR_END_0:%.*]]
; CHECK: for.body.0:
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[G_0]], 1
; CHECK-NEXT: br label [[FOR_COND_0]]
; CHECK: for.end.0:
; CHECK-NEXT: [[CALL:%.*]] = call i8* @malloc(i64 noundef 8)
; CHECK-NEXT: store i8* [[CALL]], i8** bitcast (%struct.a** @e to i8**), align 8
; CHECK-NEXT: [[B:%.*]] = bitcast i8* [[CALL]] to %struct.a**
; CHECK-NEXT: store %struct.a* null, %struct.a** [[B]], align 8
; CHECK-NEXT: br label [[FOR_COND_1:%.*]]
; CHECK: for.cond.1:
; CHECK-NEXT: [[G_1:%.*]] = phi i32 [ 0, [[FOR_END_0]] ], [ [[INC6:%.*]], [[FOR_BODY_1:%.*]] ]
; CHECK-NEXT: [[CMP_1:%.*]] = icmp ult i32 [[G_1]], 100
; CHECK-NEXT: br i1 [[CMP_1]], label [[FOR_BODY_1]], label [[FOR_END_1:%.*]]
; CHECK: for.body.1:
; CHECK-NEXT: [[CALL4:%.*]] = call i32 (i32*, ...) bitcast (i32 (i32)* @h to i32 (i32*, ...)*)(i32* nonnull [[F]])
; CHECK-NEXT: [[INC6]] = add nuw nsw i32 [[G_1]], 1
; CHECK-NEXT: br label [[FOR_COND_1]]
; CHECK: for.end.1:
; CHECK-NEXT: ret i32 0
; NOT_CGSCC_NPM-LABEL: define {{[^@]+}}@main() {
; NOT_CGSCC_NPM-NEXT: entry:
; NOT_CGSCC_NPM-NEXT: [[F:%.*]] = alloca i32, align 4
; NOT_CGSCC_NPM-NEXT: br label [[FOR_COND_0:%.*]]
; NOT_CGSCC_NPM: for.cond.0:
; NOT_CGSCC_NPM-NEXT: [[G_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY_0:%.*]] ]
; NOT_CGSCC_NPM-NEXT: [[CMP_0:%.*]] = icmp ult i32 [[G_0]], 100
; NOT_CGSCC_NPM-NEXT: br i1 [[CMP_0]], label [[FOR_BODY_0]], label [[FOR_END_0:%.*]]
; NOT_CGSCC_NPM: for.body.0:
; NOT_CGSCC_NPM-NEXT: [[INC]] = add nuw nsw i32 [[G_0]], 1
; NOT_CGSCC_NPM-NEXT: br label [[FOR_COND_0]]
; NOT_CGSCC_NPM: for.end.0:
; NOT_CGSCC_NPM-NEXT: [[CALL:%.*]] = call i8* @malloc(i64 noundef 8)
; NOT_CGSCC_NPM-NEXT: store i8* [[CALL]], i8** bitcast (%struct.a** @e to i8**), align 8
; NOT_CGSCC_NPM-NEXT: [[B:%.*]] = bitcast i8* [[CALL]] to %struct.a**
; NOT_CGSCC_NPM-NEXT: store %struct.a* null, %struct.a** [[B]], align 8
; NOT_CGSCC_NPM-NEXT: br label [[FOR_COND_1:%.*]]
; NOT_CGSCC_NPM: for.cond.1:
; NOT_CGSCC_NPM-NEXT: [[G_1:%.*]] = phi i32 [ 0, [[FOR_END_0]] ], [ [[INC6:%.*]], [[FOR_BODY_1:%.*]] ]
; NOT_CGSCC_NPM-NEXT: [[CMP_1:%.*]] = icmp ult i32 [[G_1]], 100
; NOT_CGSCC_NPM-NEXT: br i1 [[CMP_1]], label [[FOR_BODY_1]], label [[FOR_END_1:%.*]]
; NOT_CGSCC_NPM: for.body.1:
; NOT_CGSCC_NPM-NEXT: [[CALL4:%.*]] = call i32 (i32*, ...) bitcast (i32 (i32)* @h to i32 (i32*, ...)*)(i32* nonnull [[F]])
; NOT_CGSCC_NPM-NEXT: [[INC6]] = add nuw nsw i32 [[G_1]], 1
; NOT_CGSCC_NPM-NEXT: br label [[FOR_COND_1]]
; NOT_CGSCC_NPM: for.end.1:
; NOT_CGSCC_NPM-NEXT: ret i32 0
;
; IS__CGSCC____-LABEL: define {{[^@]+}}@main() {
; IS__CGSCC____-NEXT: entry:
; IS__CGSCC____-NEXT: br label [[FOR_COND_0:%.*]]
; IS__CGSCC____: for.cond.0:
; IS__CGSCC____-NEXT: [[G_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY_0:%.*]] ]
; IS__CGSCC____-NEXT: [[CMP_0:%.*]] = icmp ult i32 [[G_0]], 100
; IS__CGSCC____-NEXT: br i1 [[CMP_0]], label [[FOR_BODY_0]], label [[FOR_END_0:%.*]]
; IS__CGSCC____: for.body.0:
; IS__CGSCC____-NEXT: [[INC]] = add nuw nsw i32 [[G_0]], 1
; IS__CGSCC____-NEXT: br label [[FOR_COND_0]]
; IS__CGSCC____: for.end.0:
; IS__CGSCC____-NEXT: [[CALL:%.*]] = call i8* @malloc(i64 noundef 8)
; IS__CGSCC____-NEXT: store i8* [[CALL]], i8** bitcast (%struct.a** @e to i8**), align 8
; IS__CGSCC____-NEXT: [[B:%.*]] = bitcast i8* [[CALL]] to %struct.a**
; IS__CGSCC____-NEXT: store %struct.a* null, %struct.a** [[B]], align 8
; IS__CGSCC____-NEXT: br label [[FOR_COND_1:%.*]]
; IS__CGSCC____: for.cond.1:
; IS__CGSCC____-NEXT: [[G_1:%.*]] = phi i32 [ 0, [[FOR_END_0]] ], [ [[INC6:%.*]], [[FOR_BODY_1:%.*]] ]
; IS__CGSCC____-NEXT: [[CMP_1:%.*]] = icmp ult i32 [[G_1]], 100
; IS__CGSCC____-NEXT: br i1 [[CMP_1]], label [[FOR_BODY_1]], label [[FOR_END_1:%.*]]
; IS__CGSCC____: for.body.1:
; IS__CGSCC____-NEXT: [[INC6]] = add nuw nsw i32 [[G_1]], 1
; IS__CGSCC____-NEXT: br label [[FOR_COND_1]]
; IS__CGSCC____: for.end.1:
; IS__CGSCC____-NEXT: ret i32 0
;
entry:
%f = alloca i32