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Don't crash when !tbaa.struct contents is invalid.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2012-10-11 02:05:23 +00:00
parent e0297196ed
commit 5e01f80bf8
2 changed files with 27 additions and 6 deletions
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3
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -111,10 +111,13 @@ Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
// get the TBAA tag describing our copy.
if (MDNode *M = MI->getMetadata(LLVMContext::MD_tbaa_struct)) {
if (M->getNumOperands() == 3 &&
M->getOperand(0) &&
isa<ConstantInt>(M->getOperand(0)) &&
cast<ConstantInt>(M->getOperand(0))->isNullValue() &&
M->getOperand(1) &&
isa<ConstantInt>(M->getOperand(1)) &&
cast<ConstantInt>(M->getOperand(1))->getValue() == Size &&
M->getOperand(2) &&
isa<MDNode>(M->getOperand(2)))
CopyMD = cast<MDNode>(M->getOperand(2));
}

30
test/Transforms/InstCombine/struct-assign-tbaa.ll
View File

@ -2,25 +2,43 @@
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
%struct.foo = type { float }
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
; Verify that instcombine preserves TBAA tags when converting a memcpy into
; a scalar load and store.
%struct.test1 = type { float }
; CHECK: @test
; CHECK: %2 = load float* %0, align 4, !tbaa !0
; CHECK: store float %2, float* %1, align 4, !tbaa !0
; CHECK: !0 = metadata !{metadata !"float", metadata !1}
define void @test(%struct.foo* nocapture %a, %struct.foo* nocapture %b) {
; CHECK: ret
define void @test1(%struct.test1* nocapture %a, %struct.test1* nocapture %b) {
entry:
%0 = bitcast %struct.foo* %a to i8*
%1 = bitcast %struct.foo* %b to i8*
%0 = bitcast %struct.test1* %a to i8*
%1 = bitcast %struct.test1* %b to i8*
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 4, i32 4, i1 false), !tbaa.struct !3
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
%struct.test2 = type { i32 (i8*, i32*, double*)** }
define i32 (i8*, i32*, double*)*** @test2() {
; CHECK: @test2
; CHECK-NOT: memcpy
; CHECK: ret
%tmp = alloca %struct.test2, align 8
%tmp1 = bitcast %struct.test2* %tmp to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp1, i8* undef, i64 8, i32 8, i1 false), !tbaa.struct !4
%tmp2 = getelementptr %struct.test2* %tmp, i32 0, i32 0
%tmp3 = load i32 (i8*, i32*, double*)*** %tmp2
ret i32 (i8*, i32*, double*)*** %tmp2
}
; CHECK: !0 = metadata !{metadata !"float", metadata !1}
!0 = metadata !{metadata !"Simple C/C++ TBAA"}
!1 = metadata !{metadata !"omnipotent char", metadata !0}
!2 = metadata !{metadata !"float", metadata !0}
!3 = metadata !{i64 0, i64 4, metadata !2}
!4 = metadata !{i64 0, i64 8, null}