g++.dg/torture/pr37922.C -O3 -fomit-frame-pointer -funroll-loops was
failing for n32 and n64 on mips64-linux-gnu because we were renaming
the global pointer register to $25, even though $25 is needed by the
sequence that sets up the global pointer. This in turn was caused by
a missing earlyclobber in the loadgp_newabi_<mode> pattern.
Bit of a brown-paper-bag bug, sorry. Will backport it to the release
branches soon.
Richard
gcc/
* config/mips/mips.md (loadgp_newabi_<mode>): Add missing
earlyclobber.
Index: gcc/config/mips/mips.md
===================================================================
--- gcc/config/mips/mips.md 2011-12-31 11:43:20.000000000 +0000
+++ gcc/config/mips/mips.md 2011-12-31 11:43:28.000000000 +0000
@@ -4838,7 +4838,7 @@ (define_expand "load_const_gp_<mode>"
;; of _gp from the start of this function. Operand 1 is the incoming
;; function address.
(define_insn_and_split "loadgp_newabi_<mode>"
- [(set (match_operand:P 0 "register_operand" "=d")
+ [(set (match_operand:P 0 "register_operand" "=&d")
(unspec:P [(match_operand:P 1)
(match_operand:P 2 "register_operand" "d")]
UNSPEC_LOADGP))]
