http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53513
chrbr at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |chrbr at gcc dot gnu.org
--- Comment #8 from chrbr at gcc dot gnu.org ---
Hi Oleg,
I posted a patch in 2006
(http://gcc.gnu.org/ml/gcc-patches/2006-12/msg01562.html) to support mode
flipping fpchg instruction for the sh4a. it is in used in our current (4.8)
production compiler without issue since then.
I didn't insist a lot pushing it since too sh4a specific, but I'd be happy to
port it to the 4.10 branch and repost if there is enough interest.
Cheers
a code like
float
foo(float a)
{
return a+2;
}
compiles into:
mova .L2,r0
fmov.s @r0+,fr0
fpchg
fadd fr5,fr0
rts
fpchg
instead of:
mov.l .L2,r1
mova .L3,r0
fmov.s @r0+,fr0
lds.l @r1+,fpscr
add #-4,r1
add #4,r1
fadd fr5,fr0
rts
lds.l @r1+,fpscr
.L4:
.align 2
.L2:
.long ___fpscr_values
.L3:
.long 1073741824
