; 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(ptr %a, i32 %off, i32 %n) {
%dummy = alloca i32, i32 %n
%addr = getelementptr inbounds i64, ptr %a, i32 %off
%res = cmpxchg ptr %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(ptr %addr, i32 %n) {
%dummy = alloca i32, i32 %n
%res = cmpxchg ptr %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]])
; We used to have a bug when combining:
; - base pointer for stack frame (VLA + alignment)
; - cmpxchg8b frameindex + index reg
declare void @escape(ptr)
define void @foo_alloca_index(i32 %i, i64 %val) {
entry:
%Counters = alloca [19 x i64], align 32
%vla = alloca i32, i32 %i
call void @escape(ptr %vla)
br label %body
body:
%p = getelementptr inbounds [19 x i64], ptr %Counters, i32 0, i32 %i
%t2 = cmpxchg volatile ptr %p, i64 %val, i64 %val seq_cst seq_cst
%t3 = extractvalue { i64, i1 } %t2, 0
%cmp.i = icmp eq i64 %val, %t3
br i1 %cmp.i, label %done, label %body
done:
ret void
}
; Check that we add a LEA
; CHECK-LABEL: foo_alloca_index:
; CHECK: leal {{[0-9]*\(%e..,%e..,8\), %e..}}
; CHECK: lock cmpxchg8b ({{%e..}})
; We used to have a bug when combining:
; - base pointer for stack frame (VLA + alignment)
; - cmpxchg8b global + index reg
@Counters = external dso_local global [19 x i64]
define void @foo_alloca_index_global(i32 %i, i64 %val) {
entry:
%aligner = alloca i32, align 32
call void @escape(ptr %aligner)
%vla = alloca i32, i32 %i
call void @escape(ptr %vla)
br label %body
body:
%p = getelementptr inbounds [19 x i64], ptr @Counters, i32 0, i32 %i
%t2 = cmpxchg volatile ptr %p, i64 %val, i64 %val seq_cst seq_cst
%t3 = extractvalue { i64, i1 } %t2, 0
%cmp.i = icmp eq i64 %val, %t3
br i1 %cmp.i, label %done, label %body
done:
ret void
}
; Check that we add a LEA
; CHECK-LABEL: foo_alloca_index_global:
; CHECK: leal {{Counters\(,%e..,8\), %e..}}
; CHECK: lock cmpxchg8b ({{%e..}})
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