[SH] PR 51337 - Various testsuite ICEs for -m2a -O0

[Oleg Endo]

Hello,

the attached patch addresses PR 51337.
Tested against rev 181782 with:

make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a-single/-mb,-m4-single/-ml,-m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"

...with no new failures and 24 unexpected failure fixes for
-m2a-single. 

Cheers,
Oleg

ChangeLog:

2011-11-29  Oleg Endo  <oleg.e...@t-online.de>

        PR target/51337
        * config/sh/sh.c (sh_secondary_reload): Add case when FPUL
        register is being loaded from a pseudo in memory.



Index: gcc/config/sh/sh.c
===================================================================
--- gcc/config/sh/sh.c	(revision 181782)
+++ gcc/config/sh/sh.c	(working copy)
@@ -12432,6 +12432,14 @@
   if (rclass != GENERAL_REGS && REG_P (x)
       && TARGET_REGISTER_P (REGNO (x)))
     return GENERAL_REGS;
+
+ /* If here fall back to loading FPUL register through general registers.
+    This case can happen when movsi_ie insn is picked initially to
+    load/store the FPUL register from/to another register, and then the
+    other register is allocated on the stack.  */
+  if (rclass == FPUL_REGS && true_regnum (x) == -1)
+    return GENERAL_REGS;
+
   return NO_REGS;
 }