1; RUN: opt -S -instcombine %s -o - | FileCheck %s 2 3; Regression test of PR31990. A memcpy of one byte, copying 0xff, was 4; replaced with a single store of an i4 0xf. 5 6@g = constant i8 -1 7 8define void @foo() { 9entry: 10 %0 = alloca i8 11 %1 = bitcast i8* %0 to i4* 12 call void @bar(i4* %1) 13 %2 = bitcast i4* %1 to i8* 14 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* @g, i32 1, i1 false) 15 call void @gaz(i8* %2) 16 ret void 17} 18 19declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1) 20declare void @bar(i4*) 21declare void @gaz(i8*) 22 23; The mempcy should be simplified to a single store of an i8, not i4 24; CHECK: store i8 -1 25; CHECK-NOT: store i4 -1 26