1; RUN: llc < %s -stackrealign -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s 2 3%struct.foo = type { [88 x i8] } 4 5declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind 6declare void @baz(i8*) nounwind 7 8; PR15249 9; We can't use rep;movsl here because it clobbers the base pointer in %esi. 10define void @test1(%struct.foo* nocapture %x, i32 %y) nounwind { 11 %dynalloc = alloca i8, i32 %y, align 1 12 call void @bar(i8* %dynalloc, %struct.foo* align 4 byval %x) 13 ret void 14 15; CHECK-LABEL: test1: 16; CHECK: andl $-16, %esp 17; CHECK: movl %esp, %esi 18; CHECK-NOT: rep;movsl 19} 20 21; PR19012 22; Also don't clobber %esi if the dynamic alloca comes after the memcpy. 23define void @test2(%struct.foo* nocapture %x, i32 %y, i8* %z) nounwind { 24 call void @bar(i8* %z, %struct.foo* align 4 byval %x) 25 %dynalloc = alloca i8, i32 %y, align 1 26 call void @baz(i8* %dynalloc) 27 ret void 28 29; CHECK-LABEL: test2: 30; CHECK: movl %esp, %esi 31; CHECK-NOT: rep;movsl 32} 33 34; Check that we do use rep movs if we make the alloca static. 35define void @test3(%struct.foo* nocapture %x, i32 %y, i8* %z) nounwind { 36 call void @bar(i8* %z, %struct.foo* align 4 byval %x) 37 %statalloc = alloca i8, i32 8, align 1 38 call void @baz(i8* %statalloc) 39 ret void 40 41; CHECK-LABEL: test3: 42; CHECK: rep;movsl 43} 44