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* [gcc(refs/users/meissner/heads/work164-test)] Make moves from SPRs higher in cost.
@ 2024-04-25 23:39 Michael Meissner
0 siblings, 0 replies; 2+ messages in thread
From: Michael Meissner @ 2024-04-25 23:39 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:eebc665799dc3cacf8c57f62863b489e07d6066d
commit eebc665799dc3cacf8c57f62863b489e07d6066d
Author: Michael Meissner <meissner@linux.ibm.com>
Date: Thu Apr 25 19:38:52 2024 -0400
Make moves from SPRs higher in cost.
2024-04-25 Michael Meissner <meissner@linux.ibm.com>
gcc/
* config/rs6000/rs6000.cc (rs6000_register_move_cost): Make moves from
SPRs more expensive.
Diff:
---
gcc/config/rs6000/rs6000.cc | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 908ad5dcb58..e5ebbd58cc0 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -22813,6 +22813,16 @@ rs6000_register_move_cost (machine_mode mode,
ret = 2 * hard_regno_nregs (reg, mode);
}
+ /* Make moves from SPR registers (LR, CTR, TAR) more expensive so that the
+ register allocator does not think of these registers are useful for saving
+ results. */
+ else if (reg_classes_intersect_p (from, SPECIAL_REGS)
+ && reg_classes_intersect_p (to, GENERAL_REGS))
+ {
+ rclass = from;
+ ret = (hard_regno_nregs (LR_REGNO, mode) > 1) ? 32768 : 32;
+ }
+
/* Moves from/to GENERAL_REGS. */
else if ((rclass = from, reg_classes_intersect_p (to, GENERAL_REGS))
|| (rclass = to, reg_classes_intersect_p (from, GENERAL_REGS)))
^ permalink raw reply [flat|nested] 2+ messages in thread
* [gcc(refs/users/meissner/heads/work164-test)] Make moves from SPRs higher in cost.
@ 2024-04-25 22:10 Michael Meissner
0 siblings, 0 replies; 2+ messages in thread
From: Michael Meissner @ 2024-04-25 22:10 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d1a7529aaec43878cc0d0a5e754d894a1857d18a
commit d1a7529aaec43878cc0d0a5e754d894a1857d18a
Author: Michael Meissner <meissner@linux.ibm.com>
Date: Thu Apr 25 18:10:35 2024 -0400
Make moves from SPRs higher in cost.
2024-04-25 Michael Meissner <meissner@linux.ibm.com>
gcc/
* config/rs6000/rs6000.cc (rs6000_register_move_cost): Make moves from
SPRs more expensive.
Diff:
---
gcc/config/rs6000/rs6000.cc | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 908ad5dcb58..d498f62be7a 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -22813,6 +22813,16 @@ rs6000_register_move_cost (machine_mode mode,
ret = 2 * hard_regno_nregs (reg, mode);
}
+ /* Make moves from SPR registers (LR, CTR, TAR) more expensive so that the
+ register allocator does not think of these registers are useful for saving
+ results. */
+ else if (reg_classes_intersect_p (from, SPECIAL_REGS)
+ && reg_classes_intersect_p (to, GENERAL_REGS))
+ {
+ rclass = from;
+ ret = 6;
+ }
+
/* Moves from/to GENERAL_REGS. */
else if ((rclass = from, reg_classes_intersect_p (to, GENERAL_REGS))
|| (rclass = to, reg_classes_intersect_p (from, GENERAL_REGS)))
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-04-25 22:10 Michael Meissner
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