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4fc691d9ef
code can incorrectly move the load across a store. This never happens in practice today, but only because the current heuristics accidentally preclude it. llvm-svn: 147623
47 lines
1.2 KiB
LLVM
47 lines
1.2 KiB
LLVM
; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind {
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; CHECK: @test1
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entry:
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%tmp1 = icmp eq i32 %b, 0
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br i1 %tmp1, label %bb1, label %bb3
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bb1: ; preds = %entry
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%tmp2 = icmp sgt i32 %c, 1
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br i1 %tmp2, label %bb2, label %bb3
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; CHECK: bb1:
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; CHECK-NEXT: icmp sgt i32 %c, 1
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; CHECK-NEXT: add i32 %a, 1
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; CHECK-NEXT: select i1 %tmp2, i32 %tmp3, i32 %a
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; CHECK-NEXT: br label %bb3
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bb2: ; preds = bb1
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%tmp3 = add i32 %a, 1
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br label %bb3
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bb3: ; preds = %bb2, %entry
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%tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ]
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%tmp5 = sub i32 %tmp4, 1
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ret i32 %tmp5
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}
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declare i8 @llvm.cttz.i8(i8, i1)
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define i8 @test2(i8 %a) {
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; CHECK: @test2
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br i1 undef, label %bb_true, label %bb_false
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bb_true:
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%b = tail call i8 @llvm.cttz.i8(i8 %a, i1 false)
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br label %join
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bb_false:
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br label %join
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join:
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%c = phi i8 [%b, %bb_true], [%a, %bb_false]
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; CHECK: select
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ret i8 %c
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}
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