[Bug target/61195] New: single precision fmov does not need to switch mode

[Bug target/61195] New: single precision fmov does not need to switch mode

[chrbr at gcc dot gnu.org]

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

[Bug target/61195] single precision fmov does not need to switch mode

[chrbr at gcc dot gnu.org]

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.

[Bug target/61195] single precision fmov does not need to switch mode

[chrbr at gcc dot gnu.org]

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

[Bug target/61195] single precision fmov does not need to switch mode

[chrbr at gcc dot gnu.org]

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