derek.holloway
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94 lines
2.4 KiB
LLVM
94 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' -S -mtriple=x86_64 < %s | FileCheck %s
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; Check the idiomatic guard pattern to ensure it's lowered correctly.
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define void @test_guard(i1 %cond_0) {
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; CHECK-LABEL: @test_guard(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND_0:%.*]], label [[GUARDED:%.*]], label [[DEOPT:%.*]]
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; CHECK: deopt:
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: ret void
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; CHECK: guarded:
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; CHECK-NEXT: ret void
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;
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entry:
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%widenable_cond = call i1 @llvm.experimental.widenable.condition()
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%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
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br i1 %exiplicit_guard_cond, label %guarded, label %deopt
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deopt: ; preds = %entry
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call void @foo()
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ret void
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guarded:
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ret void
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}
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;; Test a non-guard fastpath/slowpath case
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define void @test_triangle(i1 %cond_0) {
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; CHECK-LABEL: @test_triangle(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND_0:%.*]], label [[FASTPATH:%.*]], label [[SLOWPATH:%.*]]
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; CHECK: fastpath:
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; CHECK-NEXT: call void @bar()
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; CHECK-NEXT: br label [[MERGE:%.*]]
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; CHECK: slowpath:
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: ret void
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;
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entry:
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%widenable_cond = call i1 @llvm.experimental.widenable.condition()
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%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
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br i1 %exiplicit_guard_cond, label %fastpath, label %slowpath
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fastpath:
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call void @bar()
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br label %merge
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slowpath:
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call void @foo()
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br label %merge
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merge:
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ret void
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}
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; Demonstrate that resulting CFG simplifications are made
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define void @test_cfg_simplify() {
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; CHECK-LABEL: @test_cfg_simplify(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret void
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;
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entry:
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%widenable_cond3 = call i1 @llvm.experimental.widenable.condition()
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br i1 %widenable_cond3, label %guarded2, label %deopt3
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deopt3:
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call void @foo()
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ret void
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guarded2:
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%widenable_cond4 = call i1 @llvm.experimental.widenable.condition()
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br i1 %widenable_cond4, label %merge1, label %slowpath1
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slowpath1:
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call void @foo()
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br label %merge1
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merge1:
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ret void
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}
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declare void @foo()
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declare void @bar()
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; Function Attrs: inaccessiblememonly nounwind
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declare i1 @llvm.experimental.widenable.condition() #0
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attributes #0 = { inaccessiblememonly nounwind }
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