| ; 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]]) |
