The argument could be a subreg of reg instead, which means we have to
use reg_or_subregno instead of REGNO.
Found by --enable-checking=rtl. Tested on powerpc64-linux {-m32,-m64};
committing to trunk.
Segher
2017-06-15 Segher Boessenkool <seg...@kernel.crashing.org>
* config/rs6000/rs6000.md (add<mode>3): Use reg_or_subregno instead
of REGNO.
---
gcc/config/rs6000/rs6000.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index dedb2e3..8e1b460 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -1631,7 +1631,7 @@ (define_expand "add<mode>3"
/* Adding a constant to r0 is not a valid insn, so use a different
strategy in that case. */
- if (REGNO (operands[1]) == 0 || REGNO (tmp) == 0)
+ if (reg_or_subregno (operands[1]) == 0 || reg_or_subregno (tmp) == 0)
{
if (operands[0] == operands[1])
FAIL;
--
1.9.3
