Hi Maintainers,
The below patch changes multiplication cost for -march=znver1 target.
GCC Bootstrap tested with BOOT_CFLAGS="-O2 -g -march=znver1".
(---Snip---)
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index d8a2909..b5dde5e 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -1350,11 +1350,11 @@ struct processor_costs znver1_cost = {
COSTS_N_INSNS (1), /* cost of a lea instruction. */
COSTS_N_INSNS (1), /* variable shift costs. */
COSTS_N_INSNS (1), /* constant shift costs. */
- {COSTS_N_INSNS (4), /* cost of starting multiply for QI. */
- COSTS_N_INSNS (4), /* HI. */
- COSTS_N_INSNS (4), /* SI. */
- COSTS_N_INSNS (6), /* DI. */
- COSTS_N_INSNS (6)}, /* other. */
+ {COSTS_N_INSNS (3), /* cost of starting multiply for QI. */
+ COSTS_N_INSNS (3), /* HI. */
+ COSTS_N_INSNS (3), /* SI. */
+ COSTS_N_INSNS (4), /* DI. */
+ COSTS_N_INSNS (4)}, /* other. */
0, /* cost of multiply per each bit
set. */
{COSTS_N_INSNS (19), /* cost of a divide/mod for QI. */
(---Snip---)
2016-03-05 Venkataramanan Kumar <venkataramanan.ku...@amd.com>
* config/i386/i386.c (znver1_cost): Fix Multiply cost.
Ok for trunk?
Regards,
Venkat.
