Hi,
This is a set of patches improving register costs on AArch64. The first fixes
aarch64_register_move_cost() to support CALLER_SAVE_REGS and POINTER_REGS so
costs are calculated
correctly in the register allocator.
ChangeLog:
2014-09-04 Wilco Dijkstra <wdijk...@arm.com>
* gcc/config/aarch64/aarch64.c (aarch64_register_move_cost):
Add cost handling of CALLER_SAVE_REGS and POINTER_REGS.
---
gcc/config/aarch64/aarch64.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index befdfbb..6245f59 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -5817,6 +5817,13 @@ aarch64_register_move_cost (enum machine_mode mode,
const struct cpu_regmove_cost *regmove_cost
= aarch64_tune_params->regmove_cost;
+ /* Caller save and pointer regs are equivalent to GENERAL_REGS. */
+ if (to == CALLER_SAVE_REGS || to == POINTER_REGS)
+ to = GENERAL_REGS;
+
+ if (from == CALLER_SAVE_REGS || from == POINTER_REGS)
+ from = GENERAL_REGS;
+
/* Moving between GPR and stack cost is the same as GP2GP. */
if ((from == GENERAL_REGS && to == STACK_REG)
|| (to == GENERAL_REGS && from == STACK_REG))
--
1.9.1
