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86eb682529
Summary: This is last in of a series of patches to evolve ADCE.cpp to support removing of unnecessary control flow. This patch adds the code to update the control and data flow graphs to remove the dead control flow. Also update unit tests to test the capability to remove dead, may-be-infinite loop which is enabled by the switch -adce-remove-loops. Previous patches: D23824 [ADCE] Add handling of PHI nodes when removing control flow D23559 [ADCE] Add control dependence computation D23225 [ADCE] Modify data structures to support removing control flow D23065 [ADCE] Refactor anticipating new functionality (NFC) D23102 [ADCE] Refactoring for new functionality (NFC) Reviewers: dberlin, majnemer, nadav, mehdi_amini Subscribers: llvm-commits, david2050, freik, twoh Differential Revision: https://reviews.llvm.org/D24918 llvm-svn: 289548
56 lines
1.7 KiB
LLVM
56 lines
1.7 KiB
LLVM
; RUN: opt < %s -sroa -adce -adce-remove-loops -S | FileCheck %s
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; ModuleID = 'test1.bc'
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source_filename = "test1.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind uwtable
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define i32 @foo(i32, i32, i32) #0 {
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%4 = alloca i32, align 4
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%5 = alloca i32, align 4
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%6 = alloca i32, align 4
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%7 = alloca i32, align 4
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%8 = alloca i32, align 4
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store i32 %0, i32* %4, align 4
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store i32 %1, i32* %5, align 4
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store i32 %2, i32* %6, align 4
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store i32 0, i32* %7, align 4
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%9 = load i32, i32* %5, align 4
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%I10 = icmp ne i32 %9, 0
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br i1 %I10, label %B11, label %B21
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B11:
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store i32 0, i32* %8, align 4
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br label %B12
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B12:
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%I13 = load i32, i32* %8, align 4
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%I14 = load i32, i32* %6, align 4
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%I15 = icmp slt i32 %I13, %I14
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; CHECK: br label %B20
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br i1 %I15, label %B16, label %B20
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B16:
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br label %B17
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B17:
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%I18 = load i32, i32* %8, align 4
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%I19 = add nsw i32 %I18, 1
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store i32 %I19, i32* %8, align 4
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br label %B12
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B20:
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store i32 1, i32* %7, align 4
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br label %B21
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B21:
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%I22 = load i32, i32* %7, align 4
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ret i32 %I22
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}
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attributes #0 = { nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 5864a13abf4490e76ae2eb0896198e1305927df2)"}
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