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https://github.com/c64scene-ar/llvm-6502.git
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5e1d0d39db
LLVM optimizers may widen accesses to packed structures that overflow the structure itself, but should be in bounds up to the alignment of the object git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193317 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
883 B
LLVM
30 lines
883 B
LLVM
; RUN: opt < %s -bounds-checking -S | FileCheck %s
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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-n8:16:32-S128"
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%struct.s2_packed = type <{ i64, i32, i32, i32, i16, i8 }>
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; CHECK-LABEL: @f
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; CHECK-NOT: trap
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define i16 @f() {
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entry:
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%packed1 = alloca %struct.s2_packed, align 8
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%gep = getelementptr inbounds %struct.s2_packed* %packed1, i32 0, i32 4
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%ptr = bitcast i16* %gep to i32*
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%val = load i32* %ptr, align 4
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%valt = trunc i32 %val to i16
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ret i16 %valt
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}
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; CHECK-LABEL: @f
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; CHECK: call void @llvm.trap()
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define i16 @f2() {
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entry:
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%packed1 = alloca %struct.s2_packed, align 8
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%gep = getelementptr inbounds %struct.s2_packed* %packed1, i32 0, i32 4
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%ptr = bitcast i16* %gep to i48*
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%val = load i48* %ptr, align 4
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%valt = trunc i48 %val to i16
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ret i16 %valt
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}
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