| ; RUN: opt -S -instcombine %s -o - | FileCheck %s |
| |
| ; Regression test of PR31990. A memcpy of one byte, copying 0xff, was |
| ; replaced with a single store of an i4 0xf. |
| |
| @g = constant i8 -1 |
| |
| define void @foo() { |
| entry: |
| %0 = alloca i8 |
| %1 = bitcast i8* %0 to i4* |
| call void @bar(i4* %1) |
| %2 = bitcast i4* %1 to i8* |
| call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* @g, i32 1, i32 1, i1 false) |
| call void @gaz(i8* %2) |
| ret void |
| } |
| |
| declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, |
| i8* nocapture readonly, i32, i32, i1) |
| declare void @bar(i4*) |
| declare void @gaz(i8*) |
| |
| ; The mempcy should be simplified to a single store of an i8, not i4 |
| ; CHECK: store i8 -1 |
| ; CHECK-NOT: store i4 -1 |
