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| ; RUN: llc < %s -mtriple=armv7-apple-ios -verify-machineinstrs | FileCheck %s
define void @test_cmpxchg_weak(i32 *%addr, i32 %desired, i32 %new) {
; CHECK-LABEL: test_cmpxchg_weak:
%pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic
%oldval = extractvalue { i32, i1 } %pair, 0
; CHECK-NEXT: %bb.0:
; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r0]
; CHECK-NEXT: cmp [[LOADED]], r1
; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]]
; CHECK-NEXT: %bb.1:
; CHECK-NEXT: dmb ish
; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r2, [r0]
; CHECK-NEXT: cmp [[SUCCESS]], #0
; CHECK-NEXT: beq [[SUCCESSBB:LBB[0-9]+_[0-9]+]]
; CHECK-NEXT: %bb.2:
; CHECK-NEXT: str r3, [r0]
; CHECK-NEXT: bx lr
; CHECK-NEXT: [[LDFAILBB]]:
; CHECK-NEXT: clrex
; CHECK-NEXT: str r3, [r0]
; CHECK-NEXT: bx lr
; CHECK-NEXT: [[SUCCESSBB]]:
; CHECK-NEXT: dmb ish
; CHECK-NEXT: str r3, [r0]
; CHECK-NEXT: bx lr
store i32 %oldval, i32* %addr
ret void
}
define i1 @test_cmpxchg_weak_to_bool(i32, i32 *%addr, i32 %desired, i32 %new) {
; CHECK-LABEL: test_cmpxchg_weak_to_bool:
%pair = cmpxchg weak i32* %addr, i32 %desired, i32 %new seq_cst monotonic
%success = extractvalue { i32, i1 } %pair, 1
; CHECK-NEXT: %bb.0:
; CHECK-NEXT: ldrex [[LOADED:r[0-9]+]], [r1]
; CHECK-NEXT: cmp [[LOADED]], r2
; CHECK-NEXT: bne [[LDFAILBB:LBB[0-9]+_[0-9]+]]
; CHECK-NEXT: %bb.1:
; CHECK-NEXT: dmb ish
; CHECK-NEXT: mov r0, #0
; CHECK-NEXT: strex [[SUCCESS:r[0-9]+]], r3, [r1]
; CHECK-NEXT: cmp [[SUCCESS]], #0
; CHECK-NEXT: bxne lr
; CHECK-NEXT: mov r0, #1
; CHECK-NEXT: dmb ish
; CHECK-NEXT: bx lr
; CHECK-NEXT: [[LDFAILBB]]:
; CHECK-NEXT: mov r0, #0
; CHECK-NEXT: clrex
; CHECK-NEXT: bx lr
ret i1 %success
}
|