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[ARM] Don't generate clrex for pre-v7 targets.

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Since r248294, we emit clrex, but it doesn't exist on v6.

llvm-svn: 248640
This commit is contained in:
Ahmed Bougacha 2015-09-26 00:14:02 +00:00
parent a43b643107
commit 5e8f57b519
2 changed files with 34 additions and 1 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -11739,6 +11739,8 @@ Value *ARMTargetLowering::emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
void ARMTargetLowering::emitAtomicCmpXchgNoStoreLLBalance(
IRBuilder<> &Builder) const {
if (!Subtarget->hasV7Ops())
return;
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
Builder.CreateCall(llvm::Intrinsic::getDeclaration(M, Intrinsic::arm_clrex));
}

33
test/CodeGen/ARM/atomic-cmpxchg.ll
View File

@ -1,6 +1,9 @@
; RUN: llc < %s -mtriple=arm-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-ARM
; RUN: llc < %s -mtriple=thumb-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-THUMB
; RUN: llc < %s -mtriple=armv6-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-ARMV6
; RUN: llc < %s -mtriple=thumbv6-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-THUMBV6
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-ARMV7
; RUN: llc < %s -mtriple=thumbv7-linux-gnueabi -asm-verbose=false -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-THUMBV7
@ -26,10 +29,38 @@ entry:
; CHECK-THUMB: movs r0, #1
; CHECK-THUMB: movs [[R2:r[0-9]+]], #0
; CHECK-THUMB: cmp [[R1]], {{r[0-9]+}}
; CHECK-THU<B: beq
; CHECK-THUMB: beq
; CHECK-THUMB: push {[[R2]]}
; CHECK-THUMB: pop {r0}
; CHECK-ARMV6-LABEL: test_cmpxchg_res_i8:
; CHECK-ARMV6-NEXT: .fnstart
; CHECK-ARMV6-NEXT: uxtb [[DESIRED:r[0-9]+]], r1
; CHECK-ARMV6-NEXT: [[TRY:.LBB[0-9_]+]]:
; CHECK-ARMV6-NEXT: ldrexb [[LD:r[0-9]+]], [r0]
; CHECK-ARMV6-NEXT: mov [[RES:r[0-9]+]], #0
; CHECK-ARMV6-NEXT: cmp [[LD]], [[DESIRED]]
; CHECK-ARMV6-NEXT: bne [[END:.LBB[0-9_]+]]
; CHECK-ARMV6-NEXT: strexb [[SUCCESS:r[0-9]+]], r2, [r0]
; CHECK-ARMV6-NEXT: mov [[RES]], #1
; CHECK-ARMV6-NEXT: cmp [[SUCCESS]], #0
; CHECK-ARMV6-NEXT: bne [[TRY]]
; CHECK-ARMV6-NEXT: [[END]]:
; CHECK-ARMV6-NEXT: mov r0, [[RES]]
; CHECK-ARMV6-NEXT: bx lr
; CHECK-THUMBV6-LABEL: test_cmpxchg_res_i8:
; CHECK-THUMBV6: mov [[EXPECTED:r[0-9]+]], r1
; CHECK-THUMBV6-NEXT: bl __sync_val_compare_and_swap_1
; CHECK-THUMBV6-NEXT: mov [[RES:r[0-9]+]], r0
; CHECK-THUMBV6-NEXT: movs r0, #1
; CHECK-THUMBV6-NEXT: movs [[ZERO:r[0-9]+]], #0
; CHECK-THUMBV6-NEXT: cmp [[RES]], [[EXPECTED]]
; CHECK-THUMBV6-NEXT: beq [[END:.LBB[0-9_]+]]
; CHECK-THUMBV6-NEXT: mov r0, [[ZERO]]
; CHECK-THUMBV6-NEXT: [[END]]:
; CHECK-THUMBV6-NEXT: pop {{.*}}pc}
; CHECK-ARMV7-LABEL: test_cmpxchg_res_i8:
; CHECK-ARMV7-NEXT: .fnstart
; CHECK-ARMV7-NEXT: uxtb [[DESIRED:r[0-9]+]], r1