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When traversing the use-def chain of an Argument in a candidate specialization, also query the SCCPSolver to see if a Value is constant. This allows us to better estimate the codesize savings of a candidate in the presence of instructions that are a user of the argument we are estimating savings for which also use arguments that have been found constant by IPSCCP. Similarly when estimating the dead basic blocks from branch and switch instructions which become constant, also query the SCCPSolver to see if a predecessor is unreachable.
67 lines
2.4 KiB
LLVM
67 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --include-generated-funcs --version 5
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; RUN: opt -passes="ipsccp<func-spec>" -funcspec-min-function-size=1 \
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; RUN: -funcspec-for-literal-constant=true \
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; RUN: -funcspec-min-codesize-savings=50 \
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; RUN: -funcspec-min-latency-savings=0 \
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; RUN: -S < %s | FileCheck %s
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; Verify that we are able to estimate the codesize savings arising from a branch
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; based on a binary operator, where one operand is already found constant by
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; IPSCCP.
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define i32 @main(i1 %flag) {
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%notspec = call i32 @test(i1 %flag, i1 false)
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%spec = call i32 @test(i1 false, i1 false)
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%sum = add i32 %notspec, %spec
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ret i32 %sum
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}
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define internal i32 @test(i1 %argflag, i1 %constflag) {
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entry:
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%cond = or i1 %argflag, %constflag
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br i1 %cond, label %if.then, label %if.end
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if.then:
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call void @do_something()
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call void @do_something()
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call void @do_something()
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call void @do_something()
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br label %if.end
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if.end:
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%res = phi i32 [ 0, %entry ], [ 1, %if.then]
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ret i32 %res
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}
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declare void @do_something()
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; CHECK-LABEL: define range(i32 0, 2) i32 @main(
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; CHECK-SAME: i1 [[FLAG:%.*]]) {
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; CHECK-NEXT: [[NOTSPEC:%.*]] = call i32 @test(i1 [[FLAG]], i1 false)
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; CHECK-NEXT: [[SPEC:%.*]] = call i32 @test.specialized.1(i1 false, i1 false)
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; CHECK-NEXT: [[SUM:%.*]] = add nuw nsw i32 [[NOTSPEC]], 0
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; CHECK-NEXT: ret i32 [[SUM]]
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;
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;
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; CHECK-LABEL: define internal range(i32 0, 2) i32 @test(
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; CHECK-SAME: i1 [[ARGFLAG:%.*]], i1 [[CONSTFLAG:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: [[COND:%.*]] = or i1 [[ARGFLAG]], false
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; CHECK-NEXT: br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_END:.*]]
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; CHECK: [[IF_THEN]]:
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; CHECK-NEXT: call void @do_something()
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; CHECK-NEXT: call void @do_something()
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; CHECK-NEXT: call void @do_something()
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; CHECK-NEXT: call void @do_something()
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; CHECK-NEXT: br label %[[IF_END]]
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; CHECK: [[IF_END]]:
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; CHECK-NEXT: [[RES:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ 1, %[[IF_THEN]] ]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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;
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; CHECK-LABEL: define internal i32 @test.specialized.1(
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; CHECK-SAME: i1 [[ARGFLAG:%.*]], i1 [[CONSTFLAG:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[IF_END:.*]]
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; CHECK: [[IF_END]]:
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; CHECK-NEXT: ret i32 poison
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;
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