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0dee67560f
r199771 accidently broke the logic that makes sure that SROA only splits load on byte boundaries. If such a split happens, some bits get lost when reassembling loads of wider types, causing data corruption. Move the width check up to reject such splits early, avoiding the corruption. Fixes PR19250. Patch by: Björn Steinbrink <bsteinbr@gmail.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211082 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.4 KiB
LLVM
38 lines
1.4 KiB
LLVM
; RUN: opt < %s -sroa -S | FileCheck %s
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target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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; Check that the chosen type for a split is independent from the order of
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; slices even in case of types that are skipped because their width is not a
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; byte width multiple
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define void @skipped_inttype_first({ i16*, i32 }*) {
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; CHECK-LABEL: @skipped_inttype_first
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; CHECK: alloca i8*
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%arg = alloca { i16*, i32 }, align 8
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%2 = bitcast { i16*, i32 }* %0 to i8*
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%3 = bitcast { i16*, i32 }* %arg to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %3, i8* %2, i32 16, i32 8, i1 false)
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%b = getelementptr inbounds { i16*, i32 }* %arg, i64 0, i32 0
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%pb0 = bitcast i16** %b to i63*
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%b0 = load i63* %pb0
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%pb1 = bitcast i16** %b to i8**
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%b1 = load i8** %pb1
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ret void
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}
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define void @skipped_inttype_last({ i16*, i32 }*) {
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; CHECK-LABEL: @skipped_inttype_last
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; CHECK: alloca i8*
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%arg = alloca { i16*, i32 }, align 8
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%2 = bitcast { i16*, i32 }* %0 to i8*
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%3 = bitcast { i16*, i32 }* %arg to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %3, i8* %2, i32 16, i32 8, i1 false)
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%b = getelementptr inbounds { i16*, i32 }* %arg, i64 0, i32 0
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%pb1 = bitcast i16** %b to i8**
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%b1 = load i8** %pb1
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%pb0 = bitcast i16** %b to i63*
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%b0 = load i63* %pb0
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ret void
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}
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