31 lines
1.2 KiB
LLVM
31 lines
1.2 KiB
LLVM
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; RUN: opt < %s -passes=dse -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-apple-macosx10.8.0"
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%struct.anon = type { i32, i32, i32 }
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@b = global %struct.anon { i32 1, i32 0, i32 0 }, align 4
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@c = common global i32 0, align 4
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@a = common global %struct.anon zeroinitializer, align 4
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@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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declare i32 @printf(ptr nocapture, ...) nounwind
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind
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; Make sure that the initial memcpy call does not go away
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; because the volatile load is in the way. PR12899
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; CHECK: main_entry:
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; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64
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define i32 @main() nounwind uwtable ssp {
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main_entry:
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 @b, ptr align 4 @a, i64 12, i1 false)
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%0 = load volatile i32, ptr @b, align 4
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store i32 %0, ptr @c, align 4
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 @b, ptr align 4 @a, i64 12, i1 false) nounwind
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%call = tail call i32 (ptr, ...) @printf(ptr @.str, i32 %0) nounwind
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ret i32 0
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}
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