* regrename.c (copy_value): Fix comment.

[pf3gnuchains/gcc-fork.git] / gcc / regrename.c

diff --git a/gcc/regrename.c b/gcc/regrename.c
index 91e9d71..3a596ff 100644 (file)
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -1225,7 +1225,9 @@ copy_value (rtx dest, rtx src, struct value_data *vd)
   if (frame_pointer_needed && dr == HARD_FRAME_POINTER_REGNUM)
     return;
 
-  /* Likewise for fixed or global registers.  */
+  /* Do not propagate copies to fixed or global registers, patterns
+     can be relying to see particular fixed register or users can
+     expect the chosen global register in asm.  */
   if (fixed_regs[dr] || global_regs[dr])
     return;