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* [gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] cprop_hardreg: Enable propagation of the stack pointer if possible
@ 2023-07-14 2:46 Jeff Law
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Law @ 2023-07-14 2:46 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7d8ed40207f8774e521e7210b2f725c983bc1a19
commit 7d8ed40207f8774e521e7210b2f725c983bc1a19
Author: Manolis Tsamis <manolis.tsamis@vrull.eu>
Date: Thu May 25 13:44:41 2023 +0200
cprop_hardreg: Enable propagation of the stack pointer if possible
Propagation of the stack pointer in cprop_hardreg is currenty
forbidden in all cases, due to maybe_mode_change returning NULL.
Relax this restriction and allow propagation when no mode change is
requested.
gcc/ChangeLog:
* regcprop.cc (maybe_mode_change): Enable stack pointer
propagation.
Diff:
---
gcc/regcprop.cc | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/gcc/regcprop.cc b/gcc/regcprop.cc
index f426f4fedcd..6cbfadb181f 100644
--- a/gcc/regcprop.cc
+++ b/gcc/regcprop.cc
@@ -422,7 +422,12 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
It's unclear if we need to do the same for other special registers. */
if (regno == STACK_POINTER_REGNUM)
- return NULL_RTX;
+ {
+ if (orig_mode == new_mode)
+ return stack_pointer_rtx;
+ else
+ return NULL_RTX;
+ }
if (orig_mode == new_mode)
return gen_raw_REG (new_mode, regno);
^ permalink raw reply [flat|nested] 2+ messages in thread
* [gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] cprop_hardreg: Enable propagation of the stack pointer if possible
@ 2023-06-19 11:41 Jeff Law
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Law @ 2023-06-19 11:41 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:9bf1bcc76ddc0a1dc54445700b04671ffe9d8f62
commit 9bf1bcc76ddc0a1dc54445700b04671ffe9d8f62
Author: Manolis Tsamis <manolis.tsamis@vrull.eu>
Date: Thu May 25 13:44:41 2023 +0200
cprop_hardreg: Enable propagation of the stack pointer if possible
Propagation of the stack pointer in cprop_hardreg is currenty
forbidden in all cases, due to maybe_mode_change returning NULL.
Relax this restriction and allow propagation when no mode change is
requested.
gcc/ChangeLog:
* regcprop.cc (maybe_mode_change): Enable stack pointer
propagation.
Diff:
---
gcc/regcprop.cc | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/gcc/regcprop.cc b/gcc/regcprop.cc
index f426f4fedcd..6cbfadb181f 100644
--- a/gcc/regcprop.cc
+++ b/gcc/regcprop.cc
@@ -422,7 +422,12 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
It's unclear if we need to do the same for other special registers. */
if (regno == STACK_POINTER_REGNUM)
- return NULL_RTX;
+ {
+ if (orig_mode == new_mode)
+ return stack_pointer_rtx;
+ else
+ return NULL_RTX;
+ }
if (orig_mode == new_mode)
return gen_raw_REG (new_mode, regno);
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-06-19 11:41 Jeff Law
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