1; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o - | FileCheck %s
2declare void @foo(i32, ...)
3
4declare i32 @__gxx_personality_v0(...)
5
6; We were running out of registers for this invoke, because:
7
8;     1. The lshr/and pattern gets matched to a no-REX MOV so that ah/bh/... can
9;        be used instead, cutting available registers for %b.arg down to eax, ebx,
10;        ecx, edx, esi, edi.
11;     2. We have a base pointer taking ebx out of contention.
12;     3. The landingpad block convinced us we should be defining rax here.
13;     3. The al fiddling for the varargs call only noted down that al was spillable,
14;        not ah or hax.
15;
16; So by the time we need to allocate a register for the call all registers are
17; tied up and unspillable.
18
19; CHECK-LABEL: bar:
20; CHECK: xorl %edi, %edi
21; CHECK: movb %dil, {{[0-9]+}}(%rbx)
22; CHECK: movb {{[0-9]+}}(%rbx), %al
23
24define i32 @bar(i32 %a, i32 %b, i32 %c, i32 %d, ...) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
25  %mem = alloca i32, i32 %a, align 32   ; Force rbx to be used as a base pointer
26  %b.tmp = lshr i32 %b, 8
27  %b.arg = and i32 %b.tmp, 255
28  invoke void(i32, ...) @foo(i32 42, i32* %mem, i32 %c, i32 %d, i32 %b.arg) to label %success unwind label %fail
29
30success:
31  ret i32 0
32fail:
33  %exc = landingpad { i8*, i32 } cleanup
34  %res = extractvalue { i8*, i32 } %exc, 1
35  ret i32 %res
36}
37
38; CHECK-LABEL: live:
39; CHECK: movl {{%.*}}, %eax
40
41define i32 @live(i32 %a, i32 %b, i32 %c, i32 %d, ...) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
42  %mem = alloca i32, i32 %a, align 32   ; Force rbx to be used as a base pointer
43  %b.tmp = lshr i32 %b, 8
44  %b.arg = and i32 %b.tmp, 255
45  invoke void(i32, ...) @foo(i32 42) to label %success unwind label %fail
46
47success:
48  ret i32 0
49fail:
50  %exc = landingpad { i8*, i32 } cleanup
51  %res = extractvalue { i8*, i32 } %exc, 1
52  ret i32 %b.arg
53}
54