Particularly ugly code.

llvm-svn: 28397
2006-05-19 19:41:33 +00:00 · 2006-05-19 19:41:33 +00:00 · d6a25a08d1
parent 4203df25b8
commit d6a25a08d1
1 changed files with 14 additions and 0 deletions
--- a/llvm/lib/Target/X86/README.txt
+++ b/llvm/lib/Target/X86/README.txt
@ -36,6 +36,20 @@ http://gcc.gnu.org/ml/gcc-patches/2004-04/msg00659.html

 //===---------------------------------------------------------------------===//

+On darwin/x86, we should codegen:
+
+        ret double 0.000000e+00
+
+as fld0/ret, not as:
+
+        movl $0, 4(%esp)
+        movl $0, (%esp)
+        fldl (%esp)
+	...
+        ret
+
+//===---------------------------------------------------------------------===//
+
 This should use fiadd on chips where it is profitable:
 double foo(double P, int *I) { return P+*I; }