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; RUN: llc < %s -mtriple=i686-- -stackrealign -O2 | FileCheck %s
; PR28755
; Check that register allocator is able to handle that
; a-lot-of-fixed-and-reserved-registers case. We do that by
; emmiting lea before 4 cmpxchg8b operands generators.
define void @foo_alloca(i64* %a, i32 %off, i32 %n) {
%dummy = alloca i32, i32 %n
%addr = getelementptr inbounds i64, i64* %a, i32 %off
%res = cmpxchg i64* %addr, i64 0, i64 1 monotonic monotonic
ret void
}
; CHECK-LABEL: foo_alloca
; CHECK: leal {{\(%e..,%e..,.*\)}}, [[REGISTER:%e.i]]
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: xorl %ecx, %ecx
; CHECK-NEXT: movl $1, %ebx
; CHECK-NEXT: lock cmpxchg8b ([[REGISTER]])
; If we don't use index register in the address mode -
; check that we did not generate the lea.
define void @foo_alloca_direct_address(i64* %addr, i32 %n) {
%dummy = alloca i32, i32 %n
%res = cmpxchg i64* %addr, i64 0, i64 1 monotonic monotonic
ret void
}
; CHECK-LABEL: foo_alloca_direct_address
; CHECK-NOT: leal {{\(%e.*\)}}, [[REGISTER:%e.i]]
; CHECK: lock cmpxchg8b ([[REGISTER]])
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