[llvm-commits] CVS: llvm/lib/Target/X86/X86ISelLowering.cpp

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

X86ISelLowering.cpp updated: 1.284 -> 1.285
---
Log message:

handle "st" as "st(0)"


---
Diffs of the changes:  (+12 -3)

 X86ISelLowering.cpp |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)


Index: llvm/lib/Target/X86/X86ISelLowering.cpp
diff -u llvm/lib/Target/X86/X86ISelLowering.cpp:1.284 llvm/lib/Target/X86/X86ISelLowering.cpp:1.285
--- llvm/lib/Target/X86/X86ISelLowering.cpp:1.284	Tue Oct 31 02:31:24 2006
+++ llvm/lib/Target/X86/X86ISelLowering.cpp	Tue Oct 31 13:42:44 2006
@@ -32,6 +32,7 @@
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/ADT/StringExtras.h"
 using namespace llvm;
 
 // FIXME: temporary.
@@ -5532,9 +5533,17 @@
   // constraint into a member of a register class.
   std::pair<unsigned, const TargetRegisterClass*> Res;
   Res = TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
-  
-  // Not found?  Bail out.
-  if (Res.second == 0) return Res;
+
+  // Not found as a standard register?
+  if (Res.second == 0) {
+    // GCC calls "st(0)" just plain "st".
+    if (StringsEqualNoCase("{st}", Constraint)) {
+      Res.first = X86::ST0;
+      Res.second = X86::RSTRegisterClass;
+    }
+    
+    return Res;
+  }
   
   // Otherwise, check to see if this is a register class of the wrong value
   // type.  For example, we want to map "{ax},i32" -> {eax}, we don't want it to