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xchg does not modify FLAGS. 

llvm-svn: 54411
This commit is contained in:
Dan Gohman 2008-08-06 15:52:50 +00:00
parent 8d78a09a56
commit 04f4c833e9
2 changed files with 3 additions and 2 deletions
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3
llvm/lib/Target/X86/X86Instr64bit.td
View File

@ -1125,7 +1125,8 @@ def LCMPXCHG64 : RI<0xB1, MRMDestMem, (outs), (ins i64mem:$ptr, GR64:$swap),
[(X86cas addr:$ptr, GR64:$swap, 8)]>, TB, LOCK;
}
let Constraints = "$val = $dst", Defs = [EFLAGS] in {
let Constraints = "$val = $dst" in {
let Defs = [EFLAGS] in
def LXADD64 : RI<0xC1, MRMSrcMem, (outs GR64:$dst), (ins i64mem:$ptr,GR64:$val),
"lock xadd $val, $ptr",
[(set GR64:$dst, (atomic_load_add_64 addr:$ptr, GR64:$val))]>,

2
llvm/lib/Target/X86/X86InstrInfo.td
View File

@ -2582,7 +2582,7 @@ def EH_RETURN : I<0xC3, RawFrm, (outs), (ins GR32:$addr),
// Atomic swap. These are just normal xchg instructions. But since a memory
// operand is referenced, the atomicity is ensured.
let Constraints = "$val = $dst", Defs = [EFLAGS] in {
let Constraints = "$val = $dst" in {
def XCHG32rm : I<0x87, MRMSrcMem, (outs GR32:$dst), (ins i32mem:$ptr, GR32:$val),
"xchg{l}\t{$val, $ptr|$ptr, $val}",
[(set GR32:$dst, (atomic_swap_32 addr:$ptr, GR32:$val))]>;