forked from OSchip/llvm-project
48 lines
1.7 KiB
LLVM
48 lines
1.7 KiB
LLVM
; RUN: llvm-as < %s | opt -std-compile-opts | llvm-dis | grep volatile | count 3
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; PR1520
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; Don't promote volatile loads/stores. This is really needed to handle setjmp/lonjmp properly.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
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target triple = "i686-pc-linux-gnu"
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%struct.__jmp_buf_tag = type { [6 x i32], i32, %struct.__sigset_t }
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%struct.__sigset_t = type { [32 x i32] }
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@j = external global [1 x %struct.__jmp_buf_tag] ; <[1 x %struct.__jmp_buf_tag]*> [#uses=1]
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define i32 @f() {
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entry:
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%retval = alloca i32, align 4 ; <i32*> [#uses=2]
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%v = alloca i32, align 4 ; <i32*> [#uses=3]
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%tmp = alloca i32, align 4 ; <i32*> [#uses=3]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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volatile store i32 0, i32* %v, align 4
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%tmp1 = call i32 @_setjmp( %struct.__jmp_buf_tag* getelementptr ([1 x %struct.__jmp_buf_tag]* @j, i32 0, i32 0) ) ; <i32> [#uses=1]
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%tmp2 = icmp ne i32 %tmp1, 0 ; <i1> [#uses=1]
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%tmp23 = zext i1 %tmp2 to i8 ; <i8> [#uses=1]
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%toBool = icmp ne i8 %tmp23, 0 ; <i1> [#uses=1]
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br i1 %toBool, label %bb, label %bb5
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bb: ; preds = %entry
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%tmp4 = volatile load i32* %v, align 4 ; <i32> [#uses=1]
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store i32 %tmp4, i32* %tmp, align 4
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br label %bb6
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bb5: ; preds = %entry
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volatile store i32 1, i32* %v, align 4
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call void @g( )
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store i32 0, i32* %tmp, align 4
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br label %bb6
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bb6: ; preds = %bb5, %bb
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%tmp7 = load i32* %tmp, align 4 ; <i32> [#uses=1]
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store i32 %tmp7, i32* %retval, align 4
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br label %return
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return: ; preds = %bb6
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%retval8 = load i32* %retval ; <i32> [#uses=1]
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ret i32 %retval8
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}
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declare i32 @_setjmp(%struct.__jmp_buf_tag*)
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declare void @g()
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