forked from OSchip/llvm-project
54 lines
1.8 KiB
LLVM
54 lines
1.8 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o - | FileCheck %s
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declare void @foo(i32, ...)
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declare i32 @__gxx_personality_v0(...)
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; We were running out of registers for this invoke, because:
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; 1. The lshr/and pattern gets matched to a no-REX MOV so that ah/bh/... can
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; be used instead, cutting available registers for %b.arg down to eax, ebx,
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; ecx, edx, esi, edi.
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; 2. We have a base pointer taking ebx out of contention.
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; 3. The landingpad block convinced us we should be defining rax here.
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; 3. The al fiddling for the varargs call only noted down that al was spillable,
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; not ah or hax.
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;
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; So by the time we need to allocate a register for the call all registers are
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; tied up and unspillable.
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; CHECK-LABEL: bar:
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; CHECK: xorl %edi, %edi
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; CHECK: movb %dil, {{[0-9]+}}(%rbx)
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; CHECK: movb {{[0-9]+}}(%rbx), %al
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define i32 @bar(i32 %a, i32 %b, i32 %c, i32 %d, ...) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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%mem = alloca i32, i32 %a, align 32 ; Force rbx to be used as a base pointer
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%b.tmp = lshr i32 %b, 8
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%b.arg = and i32 %b.tmp, 255
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invoke void(i32, ...) @foo(i32 42, i32* %mem, i32 %c, i32 %d, i32 %b.arg) to label %success unwind label %fail
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success:
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ret i32 0
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fail:
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%exc = landingpad { i8*, i32 } cleanup
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%res = extractvalue { i8*, i32 } %exc, 1
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ret i32 %res
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}
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; CHECK-LABEL: live:
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; CHECK: movl {{%.*}}, %eax
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define i32 @live(i32 %a, i32 %b, i32 %c, i32 %d, ...) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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%mem = alloca i32, i32 %a, align 32 ; Force rbx to be used as a base pointer
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%b.tmp = lshr i32 %b, 8
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%b.arg = and i32 %b.tmp, 255
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invoke void(i32, ...) @foo(i32 42) to label %success unwind label %fail
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success:
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ret i32 0
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fail:
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%exc = landingpad { i8*, i32 } cleanup
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%res = extractvalue { i8*, i32 } %exc, 1
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ret i32 %b.arg
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}
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