Part 3 of 4, split from the full patch. Additional optimization
opportunity, since the MSP430 does a lot of conversions between HImode
and PSImode.
gcc/
* expr.c (convert_move): If the target has an explicit converter,
use it.
Index: gcc/expr.c
===================================================================
--- gcc/expr.c (revision 211858)
+++ gcc/expr.c (working copy)
@@ -405,12 +405,32 @@ convert_move (rtx to, rtx from, int unsi
from)
: gen_rtx_FLOAT_EXTEND (to_mode, from));
return;
}
/* Handle pointer conversion. */ /* SPEE 900220. */
+ /* If the target has a converter from FROM_MODE to TO_MODE, use it. */
+ {
+ convert_optab ctab;
+
+ if (GET_MODE_PRECISION (from_mode) > GET_MODE_PRECISION (to_mode))
+ ctab = trunc_optab;
+ else if (unsignedp)
+ ctab = zext_optab;
+ else
+ ctab = sext_optab;
+
+ if (convert_optab_handler (ctab, to_mode, from_mode)
+ != CODE_FOR_nothing)
+ {
+ emit_unop_insn (convert_optab_handler (ctab, to_mode, from_mode),
+ to, from, UNKNOWN);
+ return;
+ }
+ }
+
/* Targets are expected to provide conversion insns between PxImode and
xImode for all MODE_PARTIAL_INT modes they use, but no others. */
if (GET_MODE_CLASS (to_mode) == MODE_PARTIAL_INT)
{
enum machine_mode full_mode
= smallest_mode_for_size (GET_MODE_BITSIZE (to_mode), MODE_INT);
