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https://github.com/c64scene-ar/llvm-6502.git
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Don't drop the alignment on a memcpy intrinsic when producing a store. This is
only a missed optimization opportunity if the store is over-aligned, but a miscompile if the store's new type has a higher natural alignment than the memcpy did. Fixes PR13920! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164641 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2272,8 +2272,9 @@ private:
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getName(".insert"));
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getName(".insert"));
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}
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}
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Value *Store = IRB.CreateStore(Src, DstPtr, II.isVolatile());
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StoreInst *Store = cast<StoreInst>(IRB.CreateStore(Src, DstPtr,
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(void)Store;
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II.isVolatile()));
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Store->setAlignment(II.getAlignment());
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DEBUG(dbgs() << " to: " << *Store << "\n");
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DEBUG(dbgs() << " to: " << *Store << "\n");
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return !II.isVolatile();
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return !II.isVolatile();
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}
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}
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@ -863,6 +863,7 @@ define void @test22() {
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; CHECK-NOT: alloca
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; CHECK-NOT: alloca
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; CHECK: ret void
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; CHECK: ret void
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; PR13916
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; PR13916
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entry:
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entry:
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%A = alloca %test22.struct
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%A = alloca %test22.struct
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br i1 undef, label %if.then, label %if.end
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br i1 undef, label %if.then, label %if.end
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@ -877,3 +878,18 @@ if.end: ; preds = %entry
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%tmp2 = load %test22.struct* %A
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%tmp2 = load %test22.struct* %A
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ret void
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ret void
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}
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}
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define void @test23(<2 x i64> %a, i16* %b) {
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; CHECK: @test23
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; CHECK: store {{.*}}, align 2
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; CHECK: ret void
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; PR13920
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entry:
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%a.addr = alloca <2 x i64>, align 16
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store <2 x i64> %a, <2 x i64>* %a.addr, align 16
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%0 = bitcast i16* %b to i8*
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%1 = bitcast <2 x i64>* %a.addr to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* %1, i32 16, i32 2, i1 false)
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ret void
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}
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