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| author | Michael Matz <matz@suse.de> | 2009-11-05 14:11:26 +0000 |
|---|---|---|
| committer | Michael Matz <matz@gcc.gnu.org> | 2009-11-05 14:11:26 +0000 |
| commit | 79e22ff8a4524d3f893ed01f508727d59a31a20e (patch) | |
| tree | 072cc0b7f17624b605c0faacb8c6cb7a931d9219 | |
| parent | 338311e5d77550d5eba3b760c3db517de7a93016 (diff) | |
| download | gcc-79e22ff8a4524d3f893ed01f508727d59a31a20e.zip gcc-79e22ff8a4524d3f893ed01f508727d59a31a20e.tar.gz gcc-79e22ff8a4524d3f893ed01f508727d59a31a20e.tar.bz2 | |
i386.c (ix86_builtin_reciprocal): Remove dependency on TARGET_RECIP.
* config/i386/i386.c (ix86_builtin_reciprocal): Remove dependency
on TARGET_RECIP.
* doc/invoke.texi (-mrecip): Clarify that we don't need -mrecip
for 1/sqrtf.
From-SVN: r153940
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 2 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 4 |
3 files changed, 12 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9643b5f..b5ceb7b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2009-11-05 Michael Matz <matz@suse.de> + + * config/i386/i386.c (ix86_builtin_reciprocal): Remove dependency + on TARGET_RECIP. + * doc/invoke.texi (-mrecip): Clarify that we don't need -mrecip + for 1/sqrtf. + 2009-11-04 Jason Merrill <jason@redhat.com> PR c++/36912 diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 1c064bf..2031dfb 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -26070,7 +26070,7 @@ static tree ix86_builtin_reciprocal (unsigned int fn, bool md_fn, bool sqrt ATTRIBUTE_UNUSED) { - if (! (TARGET_SSE_MATH && TARGET_RECIP && !optimize_insn_for_size_p () + if (! (TARGET_SSE_MATH && !optimize_insn_for_size_p () && flag_finite_math_only && !flag_trapping_math && flag_unsafe_math_optimizations)) return NULL_TREE; diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 0a8911b..20a9395 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -12096,6 +12096,10 @@ Note that while the throughput of the sequence is higher than the throughput of the non-reciprocal instruction, the precision of the sequence can be decreased by up to 2 ulp (i.e. the inverse of 1.0 equals 0.99999994). +Note that GCC implements 1.0f/sqrtf(x) in terms of RSQRTSS (or RSQRTPS) +already with @option{-ffast-math} (or the above option combination), and +doesn't need @option{-mrecip}. + @item -mveclibabi=@var{type} @opindex mveclibabi Specifies the ABI type to use for vectorizing intrinsics using an |