[PATCH] D61863: [X86] Prefer locked stack op over mfence for seq_cst 64-bit stores on 32-bit targets
Philip Reames via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon May 13 21:42:11 PDT 2019
This revision was automatically updated to reflect the committed changes.
Closed by commit rL360649: [X86] Prefer locked stack op over mfence for seq_cst 64-bit stores on 32-bit… (authored by reames, committed by ).
Changed prior to commit:
https://reviews.llvm.org/D61863?vs=199291&id=199371#toc
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D61863/new/
https://reviews.llvm.org/D61863
Files:
llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
llvm/trunk/test/CodeGen/X86/atomic-load-store-wide.ll
llvm/trunk/test/CodeGen/X86/atomic-non-integer.ll
Index: llvm/trunk/test/CodeGen/X86/atomic-non-integer.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/atomic-non-integer.ll
+++ llvm/trunk/test/CodeGen/X86/atomic-non-integer.ll
@@ -710,7 +710,7 @@
; X86-SSE2-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-SSE2-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
; X86-SSE2-NEXT: movlps %xmm0, (%eax)
-; X86-SSE2-NEXT: mfence
+; X86-SSE2-NEXT: lock orl $0, (%esp)
; X86-SSE2-NEXT: retl
;
; X86-AVX-LABEL: store_double_seq_cst:
@@ -718,7 +718,7 @@
; X86-AVX-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-AVX-NEXT: vmovsd {{.*#+}} xmm0 = mem[0],zero
; X86-AVX-NEXT: vmovlps %xmm0, (%eax)
-; X86-AVX-NEXT: mfence
+; X86-AVX-NEXT: lock orl $0, (%esp)
; X86-AVX-NEXT: retl
;
; X86-NOSSE-LABEL: store_double_seq_cst:
Index: llvm/trunk/test/CodeGen/X86/atomic-load-store-wide.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/atomic-load-store-wide.ll
+++ llvm/trunk/test/CodeGen/X86/atomic-load-store-wide.ll
@@ -11,7 +11,7 @@
; SSE42-NEXT: movl {{[0-9]+}}(%esp), %eax
; SSE42-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
; SSE42-NEXT: movlps %xmm0, (%eax)
-; SSE42-NEXT: mfence
+; SSE42-NEXT: lock orl $0, (%esp)
; SSE42-NEXT: retl
;
; NOSSE-LABEL: test1:
Index: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
@@ -26456,9 +26456,10 @@
Ops, MVT::i64,
Node->getMemOperand());
- // If this is a sequentially consistent store, also emit an mfence.
+ // If this is a sequentially consistent store, also emit an appropriate
+ // barrier.
if (IsSeqCst)
- Chain = DAG.getNode(X86ISD::MFENCE, dl, MVT::Other, Chain);
+ Chain = emitLockedStackOp(DAG, Subtarget, Chain, dl);
return Chain;
}
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