Hi,
This patch improves the register move costs for 128-bit types.
OK for commit?
ChangeLog:
2014-09-15 Wilco Dijkstra <wdijk...@arm.com>
* gcc/config/aarch64/aarch64.c (aarch64_register_move_cost):
Add register move costs for 128-bit types.
---
gcc/config/aarch64/aarch64.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 51e2c70..b032e93 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -5950,6 +5950,27 @@ aarch64_register_move_cost (enum machine_mode mode,
return aarch64_register_move_cost (mode, from, GENERAL_REGS)
+ aarch64_register_move_cost (mode, GENERAL_REGS, to);
+ if (GET_MODE_SIZE (mode) == 16)
+ {
+ /* 128-bit operations on general registers require 2 instructions. */
+ if (from == GENERAL_REGS && to == GENERAL_REGS)
+ return regmove_cost->GP2GP * 2;
+ else if (from == GENERAL_REGS)
+ return regmove_cost->GP2FP * 2;
+ else if (to == GENERAL_REGS)
+ return regmove_cost->FP2GP * 2;
+
+ /* When AdvSIMD instructions are disabled it is not possible to move
+ a 128-bit value directly between Q registers. This is handled in
+ secondary reload. A general register is used as a scratch to move
+ the upper DI value and the lower DI value is moved directly,
+ hence the cost is the sum of three moves. */
+ if (! TARGET_SIMD)
+ return regmove_cost->GP2FP + regmove_cost->FP2GP + regmove_cost->FP2FP;
+
+ return regmove_cost->FP2FP;
+ }
+
if (from == GENERAL_REGS && to == GENERAL_REGS)
return regmove_cost->GP2GP;
else if (from == GENERAL_REGS)
@@ -5957,14 +5978,6 @@ aarch64_register_move_cost (enum machine_mode mode,
else if (to == GENERAL_REGS)
return regmove_cost->FP2GP;
- /* When AdvSIMD instructions are disabled it is not possible to move
- a 128-bit value directly between Q registers. This is handled in
- secondary reload. A general register is used as a scratch to move
- the upper DI value and the lower DI value is moved directly,
- hence the cost is the sum of three moves. */
- if (! TARGET_SIMD && GET_MODE_SIZE (mode) == 16)
- return regmove_cost->GP2FP + regmove_cost->FP2GP + regmove_cost->FP2FP;
-
return regmove_cost->FP2FP;
}
--
1.9.1
