public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug target/61195] New: single precision fmov does not need to switch mode
@ 2014-05-15 13:55 chrbr at gcc dot gnu.org
2014-05-15 14:22 ` [Bug target/61195] " chrbr at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: chrbr at gcc dot gnu.org @ 2014-05-15 13:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61195
Bug ID: 61195
Summary: single precision fmov does not need to switch mode
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: chrbr at gcc dot gnu.org
for SH4/SH2A the compiler forces a PR mode switch for the floating point moves:
so
float
foo(float f)
{
return f;
}
compiles as:
mov.l .L2,r1
lds.l @r1+,fpscr
add #-4,r1
fmov fr4,fr0
add #4,r1
rts
lds.l @r1+,fpscr
.L3:
.align 2
.L2:
.long ___fpscr_values
This is not necessary, since the prevailing mode for PR=0 is single precision
(double precision would be set with SZ=1)
so the function can be just be compiled as
_foo:
rts
fmov fr4,fr0
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug target/61195] single precision fmov does not need to switch mode 2014-05-15 13:55 [Bug target/61195] New: single precision fmov does not need to switch mode chrbr at gcc dot gnu.org @ 2014-05-15 14:22 ` chrbr at gcc dot gnu.org 2014-05-19 8:05 ` chrbr at gcc dot gnu.org 2014-05-20 10:29 ` chrbr at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: chrbr at gcc dot gnu.org @ 2014-05-15 14:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61195 --- Comment #1 from chrbr at gcc dot gnu.org --- movsf_ie forces the fp_mode attr for all constraints. Testing a fix. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/61195] single precision fmov does not need to switch mode 2014-05-15 13:55 [Bug target/61195] New: single precision fmov does not need to switch mode chrbr at gcc dot gnu.org 2014-05-15 14:22 ` [Bug target/61195] " chrbr at gcc dot gnu.org @ 2014-05-19 8:05 ` chrbr at gcc dot gnu.org 2014-05-20 10:29 ` chrbr at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: chrbr at gcc dot gnu.org @ 2014-05-19 8:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61195 --- Comment #2 from chrbr at gcc dot gnu.org --- Author: chrbr Date: Mon May 19 08:04:22 2014 New Revision: 210608 URL: http://gcc.gnu.org/viewcvs?rev=210608&root=gcc&view=rev Log: PR target/61195 * config/sh/sh.md (movsf_ie): Unset fp_mode for fmov Added: trunk/gcc/testsuite/gcc.target/sh/pr61195.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/sh/sh.md trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/61195] single precision fmov does not need to switch mode 2014-05-15 13:55 [Bug target/61195] New: single precision fmov does not need to switch mode chrbr at gcc dot gnu.org 2014-05-15 14:22 ` [Bug target/61195] " chrbr at gcc dot gnu.org 2014-05-19 8:05 ` chrbr at gcc dot gnu.org @ 2014-05-20 10:29 ` chrbr at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: chrbr at gcc dot gnu.org @ 2014-05-20 10:29 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61195 chrbr at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #3 from chrbr at gcc dot gnu.org --- in 4.10 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-05-20 10:29 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-05-15 13:55 [Bug target/61195] New: single precision fmov does not need to switch mode chrbr at gcc dot gnu.org 2014-05-15 14:22 ` [Bug target/61195] " chrbr at gcc dot gnu.org 2014-05-19 8:05 ` chrbr at gcc dot gnu.org 2014-05-20 10:29 ` chrbr at gcc dot gnu.org
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).