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db854cedfc
This is a fix for https://bugs.llvm.org/show_bug.cgi?id=40554 Some CPU's trap to the kernel on unaligned floating point access and there are kernels that do not handle the interrupt. The program then fails with a SIGBUS according to the PR. This just switches the default for unaligned access to only allow it on recent server CPUs that are known to allow this. Differential revision: https://reviews.llvm.org/D71954
63 lines
2.5 KiB
LLVM
63 lines
2.5 KiB
LLVM
; RUN: llc -verify-machineinstrs -mattr=-vsx \
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; RUN: -mattr=+allow-unaligned-fp-access < %s | FileCheck %s
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; ModuleID = 'foo.c'
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target triple = "powerpc-unknown-linux-gnu"
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%struct.anon = type <{ i8, float }>
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@s = global %struct.anon <{ i8 3, float 0x4014666660000000 }> ; <%struct.anon*> [#uses=1]
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@u = global <{ i8, double }> <{ i8 3, double 5.100000e+00 }> ; <<{ i8, double }>*> [#uses=1]
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@t = weak global %struct.anon zeroinitializer ; <%struct.anon*> [#uses=2]
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@v = weak global <{ i8, double }> zeroinitializer ; <<{ i8, double }>*> [#uses=2]
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@.str = internal constant [8 x i8] c"%f %lf\0A\00" ; <[8 x i8]*> [#uses=1]
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; CHECK: foo
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; CHECK: lfs
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; CHECK: lfd
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; CHECK: stfs
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; CHECK: stfd
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; CHECK: blr
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define i32 @foo() {
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entry:
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%retval = alloca i32, align 4 ; <i32*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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%tmp = getelementptr %struct.anon, %struct.anon* @s, i32 0, i32 1 ; <float*> [#uses=1]
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%tmp1 = load float, float* %tmp, align 1 ; <float> [#uses=1]
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%tmp2 = getelementptr %struct.anon, %struct.anon* @t, i32 0, i32 1 ; <float*> [#uses=1]
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store float %tmp1, float* %tmp2, align 1
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%tmp3 = getelementptr <{ i8, double }>, <{ i8, double }>* @u, i32 0, i32 1 ; <double*> [#uses=1]
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%tmp4 = load double, double* %tmp3, align 1 ; <double> [#uses=1]
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%tmp5 = getelementptr <{ i8, double }>, <{ i8, double }>* @v, i32 0, i32 1 ; <double*> [#uses=1]
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store double %tmp4, double* %tmp5, align 1
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br label %return
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return: ; preds = %entry
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%retval6 = load i32, i32* %retval ; <i32> [#uses=1]
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ret i32 %retval6
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}
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; CHECK: main
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; CHECK: lfs
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; CHECK: lfd
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; CHECK: blr
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define i32 @main() {
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entry:
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%retval = alloca i32, align 4 ; <i32*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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%tmp = call i32 @foo( ) ; <i32> [#uses=0]
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%tmp1 = getelementptr %struct.anon, %struct.anon* @t, i32 0, i32 1 ; <float*> [#uses=1]
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%tmp2 = load float, float* %tmp1, align 1 ; <float> [#uses=1]
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%tmp23 = fpext float %tmp2 to double ; <double> [#uses=1]
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%tmp4 = getelementptr <{ i8, double }>, <{ i8, double }>* @v, i32 0, i32 1 ; <double*> [#uses=1]
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%tmp5 = load double, double* %tmp4, align 1 ; <double> [#uses=1]
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%tmp6 = getelementptr [8 x i8], [8 x i8]* @.str, i32 0, i32 0 ; <i8*> [#uses=1]
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%tmp7 = call i32 (i8*, ...) @printf( i8* %tmp6, double %tmp23, double %tmp5 ) ; <i32> [#uses=0]
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br label %return
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return: ; preds = %entry
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%retval8 = load i32, i32* %retval ; <i32> [#uses=1]
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ret i32 %retval8
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}
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declare i32 @printf(i8*, ...)
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