[llvm-commits] [llvm] r42426 - /llvm/trunk/lib/Target/X86/X86InstrInfo.td

[Evan Cheng]

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),