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Pessimisively assume ADJCALLSTACKDOWN / ADJCALLSTACKUP (which becomes sub / add) clobbers EFLAGS.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42426 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-09-28 01:19:48 +00:00
parent 317096ab37
commit 8decf6bc18
1 changed files with 3 additions and 1 deletions
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4
lib/Target/X86/X86InstrInfo.td
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@ -261,7 +261,9 @@ def extloadi32i16 : PatFrag<(ops node:$ptr), (i32 (extloadi16 node:$ptr))>;
// ADJCALLSTACKDOWN/UP implicitly use/def ESP because they may be expanded into
// a stack adjustment and the codegen must know that they may modify the stack
// pointer before prolog-epilog rewriting occurs.
let Defs = [ESP], Uses = [ESP] in {
// Pessimisively assume ADJCALLSTACKDOWN / ADJCALLSTACKUP will become sub / add
// which can clobber EFLAGS.
let Defs = [ESP, EFLAGS], Uses = [ESP] in {
def ADJCALLSTACKDOWN : I<0, Pseudo, (outs), (ins i32imm:$amt), "#ADJCALLSTACKDOWN",
[(X86callseq_start imm:$amt)]>;
def ADJCALLSTACKUP : I<0, Pseudo, (outs), (ins i32imm:$amt1, i32imm:$amt2),