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| author | Jakub Jelinek <jakub@redhat.com> | 2023-03-10 20:39:54 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2023-03-10 20:39:54 +0100 |
| commit | 246127ab238bac6aa71a9b4ee1f6fabf776b5ccb (patch) | |
| tree | 19f2dd70c6885c304c5a5e4f9f0dfe9c19597a3e /libgcc/config | |
| parent | 60b6f5c0a334db3f8f6dffaf0b9aab42fd5c54a2 (diff) | |
| download | gcc-246127ab238bac6aa71a9b4ee1f6fabf776b5ccb.zip gcc-246127ab238bac6aa71a9b4ee1f6fabf776b5ccb.tar.gz gcc-246127ab238bac6aa71a9b4ee1f6fabf776b5ccb.tar.bz2 | |
libgcc, i386: Add __fix{,uns}bfti and __float{,un}tibf [PR107703]
While DI <-> BF conversions can be handled (and are) through
DI <-> XF <-> BF and for narrower integral modes even sometimes
through DF or SF, because XFmode has 64-bit mantissa and so all
the DImode values are exactly representable in XFmode.
That is not the case for TImode, and while e.g. the HF -> TI
conversions are IMHO useless in libgcc, because HFmode has
-65504.0f16, 65504.0f16 range, all the integers will be already
representable in SImode (or even HImode for unsigned) and so
I think HF -> DI -> TI conversions are faster and valid,
BFmode has roughly the same range as SFmode and so we absolutely need
the TI -> BF conversions to avoid double rounding.
As for BF -> TI conversions, they can be either also implemented
in libgcc, or they can be implemented (as done in this commit)
as BF -> SF -> TI conversions with the same code generation used
elsewhere, just doing the 16-bit left shift of the bits - I think
we don't need to handle sNaNs during the BF -> SF part because
SF -> TI (which is already a libcall too) will handle that too.
The BF -> SF -> TI path avoids wasting
32: 0000000000015e10 321 FUNC GLOBAL DEFAULT 13 __fixbfti@@GCC_13.0.0
89: 0000000000015f60 299 FUNC GLOBAL DEFAULT 13 __fixunsbfti@@GCC_13.0.0
2023-03-10 Jakub Jelinek <jakub@redhat.com>
PR target/107703
* optabs.cc (expand_fix): For conversions from BFmode to integral,
use shifts to convert it to SFmode first and then convert SFmode
to integral.
* soft-fp/floattibf.c: New file.
* soft-fp/floatuntibf.c: New file.
* config/i386/libgcc-glibc.ver: Export __float{,un}tibf @ GCC_13.0.0.
* config/i386/64/t-softfp (softfp_extras): Add floattibf and
floatuntibf.
(CFLAGS-floattibf.c, CFLAGS-floatunstibf.c): Add -msse2.
Diffstat (limited to 'libgcc/config')
| -rw-r--r-- | libgcc/config/i386/64/t-softfp | 5 | ||||
| -rw-r--r-- | libgcc/config/i386/libgcc-glibc.ver | 2 |
2 files changed, 6 insertions, 1 deletions
diff --git a/libgcc/config/i386/64/t-softfp b/libgcc/config/i386/64/t-softfp index 3bec464..197fa11 100644 --- a/libgcc/config/i386/64/t-softfp +++ b/libgcc/config/i386/64/t-softfp @@ -1,6 +1,9 @@ -softfp_extras := fixhfti fixunshfti floattihf floatuntihf +softfp_extras := fixhfti fixunshfti floattihf floatuntihf \ + floattibf floatuntibf CFLAGS-fixhfti.c += -msse2 CFLAGS-fixunshfti.c += -msse2 CFLAGS-floattihf.c += -msse2 CFLAGS-floatunstihf.c += -msse2 +CFLAGS-floattibf.c += -msse2 +CFLAGS-floatunstibf.c += -msse2 diff --git a/libgcc/config/i386/libgcc-glibc.ver b/libgcc/config/i386/libgcc-glibc.ver index fa8934b..d84d075 100644 --- a/libgcc/config/i386/libgcc-glibc.ver +++ b/libgcc/config/i386/libgcc-glibc.ver @@ -218,6 +218,8 @@ GCC_12.0.0 { %inherit GCC_13.0.0 GCC_12.0.0 GCC_13.0.0 { __extendbfsf2 + __floattibf + __floatuntibf __truncdfbf2 __truncsfbf2 __trunctfbf2 |