2017-08-02 08:28:10 +08:00
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; RUN: llc < %s -mtriple=i686-- -stackrealign -O2 | FileCheck %s
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2016-11-24 21:23:35 +08:00
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; PR28755
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; Check that register allocator is able to handle that
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; a-lot-of-fixed-and-reserved-registers case. We do that by
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; emmiting lea before 4 cmpxchg8b operands generators.
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define void @foo_alloca(i64* %a, i32 %off, i32 %n) {
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%dummy = alloca i32, i32 %n
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%addr = getelementptr inbounds i64, i64* %a, i32 %off
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%res = cmpxchg i64* %addr, i64 0, i64 1 monotonic monotonic
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ret void
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}
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; CHECK-LABEL: foo_alloca
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; CHECK: leal {{\(%e..,%e..,.*\)}}, [[REGISTER:%e.i]]
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: xorl %edx, %edx
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; CHECK-NEXT: xorl %ecx, %ecx
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; CHECK-NEXT: movl $1, %ebx
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; CHECK-NEXT: lock cmpxchg8b ([[REGISTER]])
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; If we don't use index register in the address mode -
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; check that we did not generate the lea.
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define void @foo_alloca_direct_address(i64* %addr, i32 %n) {
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%dummy = alloca i32, i32 %n
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%res = cmpxchg i64* %addr, i64 0, i64 1 monotonic monotonic
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ret void
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}
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; CHECK-LABEL: foo_alloca_direct_address
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; CHECK-NOT: leal {{\(%e.*\)}}, [[REGISTER:%e.i]]
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; CHECK: lock cmpxchg8b ([[REGISTER]])
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