167 lines
4.6 KiB
LLVM
167 lines
4.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-- -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=X64
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; RUN: llc < %s -mtriple=i686-- -mattr=+sse2 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=X32
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; On x86, an atomic rmw operation that does not modify the value in memory
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; (such as atomic add 0) can be replaced by an mfence followed by a mov.
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; This is explained (with the motivation for such an optimization) in
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; http://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf
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define i8 @add8(i8* %p) {
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; X64-LABEL: add8:
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; X64: # %bb.0:
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; X64-NEXT: mfence
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; X64-NEXT: movb (%rdi), %al
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; X64-NEXT: retq
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;
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; X32-LABEL: add8:
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; X32: # %bb.0:
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; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: mfence
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; X32-NEXT: movb (%eax), %al
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; X32-NEXT: retl
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%1 = atomicrmw add i8* %p, i8 0 monotonic
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ret i8 %1
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}
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define i16 @or16(i16* %p) {
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; X64-LABEL: or16:
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; X64: # %bb.0:
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; X64-NEXT: mfence
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; X64-NEXT: movzwl (%rdi), %eax
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; X64-NEXT: retq
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;
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; X32-LABEL: or16:
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; X32: # %bb.0:
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; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: mfence
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; X32-NEXT: movzwl (%eax), %eax
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; X32-NEXT: retl
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%1 = atomicrmw or i16* %p, i16 0 acquire
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ret i16 %1
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}
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define i32 @xor32(i32* %p) {
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; X64-LABEL: xor32:
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; X64: # %bb.0:
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; X64-NEXT: mfence
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; X64-NEXT: movl (%rdi), %eax
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; X64-NEXT: retq
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;
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; X32-LABEL: xor32:
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; X32: # %bb.0:
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; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: mfence
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; X32-NEXT: movl (%eax), %eax
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; X32-NEXT: retl
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%1 = atomicrmw xor i32* %p, i32 0 release
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ret i32 %1
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}
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define i64 @sub64(i64* %p) {
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; X64-LABEL: sub64:
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; X64: # %bb.0:
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; X64-NEXT: mfence
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; X64-NEXT: movq (%rdi), %rax
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; X64-NEXT: retq
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;
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; X32-LABEL: sub64:
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; X32: # %bb.0:
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; X32-NEXT: pushl %ebx
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; X32-NEXT: .cfi_def_cfa_offset 8
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; X32-NEXT: pushl %esi
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; X32-NEXT: .cfi_def_cfa_offset 12
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; X32-NEXT: .cfi_offset %esi, -12
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; X32-NEXT: .cfi_offset %ebx, -8
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; X32-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X32-NEXT: movl (%esi), %eax
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; X32-NEXT: movl 4(%esi), %edx
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; X32-NEXT: .p2align 4, 0x90
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; X32-NEXT: .LBB3_1: # %atomicrmw.start
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; X32-NEXT: # =>This Inner Loop Header: Depth=1
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; X32-NEXT: movl %edx, %ecx
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; X32-NEXT: movl %eax, %ebx
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; X32-NEXT: lock cmpxchg8b (%esi)
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; X32-NEXT: jne .LBB3_1
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; X32-NEXT: # %bb.2: # %atomicrmw.end
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; X32-NEXT: popl %esi
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; X32-NEXT: .cfi_def_cfa_offset 8
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; X32-NEXT: popl %ebx
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; X32-NEXT: .cfi_def_cfa_offset 4
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; X32-NEXT: retl
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%1 = atomicrmw sub i64* %p, i64 0 seq_cst
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ret i64 %1
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}
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define i128 @or128(i128* %p) {
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; X64-LABEL: or128:
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; X64: # %bb.0:
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; X64-NEXT: pushq %rax
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; X64-NEXT: .cfi_def_cfa_offset 16
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; X64-NEXT: xorl %esi, %esi
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: callq __sync_fetch_and_or_16
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; X64-NEXT: popq %rcx
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; X64-NEXT: .cfi_def_cfa_offset 8
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; X64-NEXT: retq
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;
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; X32-LABEL: or128:
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; X32: # %bb.0:
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; X32-NEXT: pushl %ebp
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; X32-NEXT: .cfi_def_cfa_offset 8
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; X32-NEXT: .cfi_offset %ebp, -8
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; X32-NEXT: movl %esp, %ebp
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; X32-NEXT: .cfi_def_cfa_register %ebp
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; X32-NEXT: pushl %edi
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; X32-NEXT: pushl %esi
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; X32-NEXT: andl $-8, %esp
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; X32-NEXT: subl $16, %esp
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; X32-NEXT: .cfi_offset %esi, -16
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; X32-NEXT: .cfi_offset %edi, -12
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; X32-NEXT: movl 8(%ebp), %esi
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; X32-NEXT: movl %esp, %eax
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; X32-NEXT: pushl $0
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; X32-NEXT: pushl $0
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; X32-NEXT: pushl $0
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; X32-NEXT: pushl $0
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; X32-NEXT: pushl 12(%ebp)
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; X32-NEXT: pushl %eax
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; X32-NEXT: calll __sync_fetch_and_or_16
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; X32-NEXT: addl $20, %esp
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; X32-NEXT: movl (%esp), %eax
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; X32-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X32-NEXT: movl {{[0-9]+}}(%esp), %edx
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; X32-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X32-NEXT: movl %edi, 12(%esi)
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; X32-NEXT: movl %edx, 8(%esi)
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; X32-NEXT: movl %ecx, 4(%esi)
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; X32-NEXT: movl %eax, (%esi)
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; X32-NEXT: movl %esi, %eax
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; X32-NEXT: leal -8(%ebp), %esp
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; X32-NEXT: popl %esi
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; X32-NEXT: popl %edi
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; X32-NEXT: popl %ebp
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; X32-NEXT: .cfi_def_cfa %esp, 4
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; X32-NEXT: retl $4
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%1 = atomicrmw or i128* %p, i128 0 monotonic
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ret i128 %1
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}
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; For 'and', the idempotent value is (-1)
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define i32 @and32 (i32* %p) {
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; X64-LABEL: and32:
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; X64: # %bb.0:
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; X64-NEXT: mfence
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; X64-NEXT: movl (%rdi), %eax
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; X64-NEXT: retq
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;
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; X32-LABEL: and32:
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; X32: # %bb.0:
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; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: mfence
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; X32-NEXT: movl (%eax), %eax
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; X32-NEXT: retl
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%1 = atomicrmw and i32* %p, i32 -1 acq_rel
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ret i32 %1
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}
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