public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r14-1873] cprop_hardreg: Enable propagation of the stack pointer if possible
@ 2023-06-15 20:13 Philipp Tomsich
0 siblings, 0 replies; only message in thread
From: Philipp Tomsich @ 2023-06-15 20:13 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:6a2e8dcbbd4bab374b27abea375bf7a921047800
commit r14-1873-g6a2e8dcbbd4bab374b27abea375bf7a921047800
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] only message in thread
only message in thread, other threads:[~2023-06-15 20:13 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-15 20:13 [gcc r14-1873] cprop_hardreg: Enable propagation of the stack pointer if possible Philipp Tomsich
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).