forked from OSchip/llvm-project
60 lines
1.2 KiB
LLVM
60 lines
1.2 KiB
LLVM
; RUN: opt < %s -jump-threading -S -verify | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@a = global i32 0, align 4
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define void @foo(i32 %cond1, i32 %cond2) {
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; CHECK-LABEL: @foo
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; CHECK-LABEL: entry
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entry:
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%tobool = icmp eq i32 %cond1, 0
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br i1 %tobool, label %bb.cond2, label %bb.f1
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bb.f1:
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call void @f1()
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br label %bb.cond2
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; Verify that we branch on cond2 without checking ptr.
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; CHECK: call void @f1()
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; CHECK-NEXT: icmp eq i32 %cond2, 0
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; CHECK-NEXT: label %bb.f4, label %bb.f2
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bb.cond2:
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%ptr = phi i32* [ null, %bb.f1 ], [ @a, %entry ]
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%tobool1 = icmp eq i32 %cond2, 0
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br i1 %tobool1, label %bb.file, label %bb.f2
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; Verify that we branch on cond2 without checking ptr.
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; CHECK: icmp eq i32 %cond2, 0
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; CHECK-NEXT: label %bb.f3, label %bb.f2
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bb.f2:
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call void @f2()
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br label %exit
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; Verify that we eliminate this basic block.
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; CHECK-NOT: bb.file:
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bb.file:
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%cmp = icmp eq i32* %ptr, null
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br i1 %cmp, label %bb.f4, label %bb.f3
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bb.f3:
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call void @f3()
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br label %exit
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bb.f4:
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call void @f4()
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br label %exit
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exit:
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ret void
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}
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declare void @f1()
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declare void @f2()
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declare void @f3()
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declare void @f4()
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