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See http://gcc.gnu.org/PR15089
"In some cases the specified register for a local variable meant to be
used with inline assembly code is not respected. This breaks code
relying on this feature to implement non-standard calling convension."
This fix is probably needed to properly implement linux syscalls in some architectures.
First added to crosstool by Jamie Hicks, see
http://www.handhelds.org/hypermail/kernel-discuss/current/0066.html
Index: gcc/loop.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/loop.c,v
retrieving revision 1.488.2.3
diff -u -r1.488.2.3 loop.c
--- gcc-old/gcc/loop.c 14 Feb 2004 14:46:03 -0000 1.488.2.3
+++ gcc-new/gcc/loop.c 28 Apr 2004 22:02:53 -0000
@@ -929,6 +929,7 @@
|| (! (GET_CODE (SET_SRC (set)) == REG
&& (REGNO (SET_SRC (set))
< FIRST_PSEUDO_REGISTER))))
+ && regno >= FIRST_PSEUDO_REGISTER
/* This test is not redundant; SET_SRC (set) might be
a call-clobbered register and the life of REGNO
might span a call. */
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