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llvm-project/llvm/test/CodeGen/X86/2010-01-08-Atomic64Bug.ll

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Fix a critical bug in 64-bit atomic operation lowering for 32-bit. The results of the cmpxchg8b instructions are being thrown away when it branches back to the top of the checking loop. This means the loop always compares against the old value and this can result in a dead lock. llvm-svn: 93028
2010-01-09 07:41:50 +08:00
; RUN: llc < %s -mtriple=i386-apple-darwin | FileCheck %s
; rdar://r7512579
; PHI defs in the atomic loop should be used by the add / adc
; instructions. They should not be dead.
define void @t(i64* nocapture %p) nounwind ssp {
entry:
; CHECK: t:
; CHECK: movl $1
; CHECK: movl (%ebp), %eax
; CHECK: movl 4(%ebp), %edx
Start function numbering at 0. llvm-svn: 101638
2010-04-18 00:29:15 +08:00
; CHECK: LBB0_1:
Fix a critical bug in 64-bit atomic operation lowering for 32-bit. The results of the cmpxchg8b instructions are being thrown away when it branches back to the top of the checking loop. This means the loop always compares against the old value and this can result in a dead lock. llvm-svn: 93028
2010-01-09 07:41:50 +08:00
; CHECK-NOT: movl $1
; CHECK-NOT: movl $0
; CHECK: addl
; CHECK: adcl
; CHECK: lock
; CHECK: cmpxchg8b
; CHECK: jne
Convert a bunch more tests over to the new atomic instructions. llvm-svn: 140582
2011-09-27 07:15:09 +08:00
%0 = atomicrmw add i64* %p, i64 1 seq_cst
Fix a critical bug in 64-bit atomic operation lowering for 32-bit. The results of the cmpxchg8b instructions are being thrown away when it branches back to the top of the checking loop. This means the loop always compares against the old value and this can result in a dead lock. llvm-svn: 93028
2010-01-09 07:41:50 +08:00
ret void
}