[llvm-commits] [llvm] r81726 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
Chris Lattner
sabre at nondot.org
Sun Sep 13 15:41:48 PDT 2009
Author: lattner
Date: Sun Sep 13 17:41:48 2009
New Revision: 81726
URL: http://llvm.org/viewvc/llvm-project?rev=81726&view=rev
Log:
add some special case handling for strangely named x86 registers.
Modified:
llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=81726&r1=81725&r2=81726&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Sun Sep 13 17:41:48 2009
@@ -9324,15 +9324,39 @@
// Not found as a standard register?
if (Res.second == 0) {
- // GCC calls "st(0)" just plain "st".
+ // Map st(0) -> st(7) -> ST0
+ if (Constraint.size() == 7 && Constraint[0] == '{' &&
+ tolower(Constraint[1]) == 's' &&
+ tolower(Constraint[2]) == 't' &&
+ Constraint[3] == '(' &&
+ (Constraint[4] >= '0' && Constraint[4] <= '7') &&
+ Constraint[5] == ')' &&
+ Constraint[6] == '}') {
+
+ Res.first = X86::ST0+Constraint[4]-'0';
+ Res.second = X86::RFP80RegisterClass;
+ return Res;
+ }
+
+ // GCC allows "st(0)" to be called just plain "st".
if (StringsEqualNoCase("{st}", Constraint)) {
Res.first = X86::ST0;
Res.second = X86::RFP80RegisterClass;
+ return Res;
+ }
+
+ // flags -> EFLAGS
+ if (StringsEqualNoCase("{flags}", Constraint)) {
+ Res.first = X86::EFLAGS;
+ Res.second = X86::CCRRegisterClass;
+ return Res;
}
+
// 'A' means EAX + EDX.
if (Constraint == "A") {
Res.first = X86::EAX;
Res.second = X86::GR32_ADRegisterClass;
+ return Res;
}
return Res;
}
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