1 ; RUN: llc < %s -force-align-stack -mtriple i386-apple-darwin -mcpu=i486 | FileCheck %s 2 3 %struct.foo = type { [88 x i8] } 4 5 declare void @bar(i8* nocapture, %struct.foo* align 4 byval) nounwind 6 declare void @baz(i8*) nounwind 7 8 ; PR15249 9 ; We can't use rep;movsl here because it clobbers the base pointer in %esi. 10 define 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. 23 define 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. 35 define 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
