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057f75da4b
The alignment parameter to getExtLoad is treated as a base alignment, not the alignment of the load (base + offset). When we infer a better alignment for a Ptr we need to ensure that it applies to the base to prevent the alignment on the load from being wrong. This fixes a bug where the alignment could then be used to incorrectly prove noalias between a load and a store, leading to a miscompile. Differential Revision: https://reviews.llvm.org/D48029 llvm-svn: 335210
26 lines
927 B
LLVM
26 lines
927 B
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv8-arm-none-eabi"
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; Check the loads happen after the stores (note: directly returning 0 is also valid)
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; CHECK-LABEL: somesortofhash
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; CHECK-NOT: ldr
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; CHECK: str
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define i64 @somesortofhash() {
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entry:
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%helper = alloca i8, i32 64, align 8
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%helper.0.4x32 = bitcast i8* %helper to <4 x i32>*
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%helper.20 = getelementptr inbounds i8, i8* %helper, i32 20
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%helper.24 = getelementptr inbounds i8, i8* %helper, i32 24
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store <4 x i32> zeroinitializer, <4 x i32>* %helper.0.4x32, align 8
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%helper.20.32 = bitcast i8* %helper.20 to i32*
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%helper.24.32 = bitcast i8* %helper.24 to i32*
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store i32 0, i32* %helper.20.32
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store i32 0, i32* %helper.24.32, align 8
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%helper.20.64 = bitcast i8* %helper.20 to i64*
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%load.helper.20.64 = load i64, i64* %helper.20.64, align 4
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ret i64 %load.helper.20.64
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}
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