Author: evancheng
Date: Thu Sep 27 20:19:48 2007
New Revision: 42426
URL: http://llvm.org/viewvc/llvm-project?rev=42426&view=rev
Log:
Pessimisively assume ADJCALLSTACKDOWN / ADJCALLSTACKUP (which becomes sub /
add) clobbers EFLAGS.
Modified:
llvm/trunk/lib/Target/X86/X86InstrInfo.td
Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.td
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.td?rev=42426&r1=42425&r2=42426&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrInfo.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrInfo.td Thu Sep 27 20:19:48 2007
@@ -261,7 +261,9 @@
// 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),
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