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| author | Maciej W. Rozycki <macro@codesourcery.com> | 2013-02-21 14:06:52 +0000 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@gcc.gnu.org> | 2013-02-21 14:06:52 +0000 |
| commit | c0da9c377c3b2099c3dd8f28864abce6304889dd (patch) | |
| tree | 4351561645598260c30a7c405c8477a0ad8268aa | |
| parent | d247ea0cbd3bba7531e3eb0d77f8509ec6276d5b (diff) | |
| download | gcc-c0da9c377c3b2099c3dd8f28864abce6304889dd.zip gcc-c0da9c377c3b2099c3dd8f28864abce6304889dd.tar.gz gcc-c0da9c377c3b2099c3dd8f28864abce6304889dd.tar.bz2 | |
invoke.texi (MIPS Options): Update documentation of the floating-point multiply-accumulate instruction...
* doc/invoke.texi (MIPS Options): Update documentation of the
floating-point multiply-accumulate instruction restrictions.
From-SVN: r196204
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 10 |
2 files changed, 11 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fbf9f53..36d14d0 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2013-02-21 Maciej W. Rozycki <macro@codesourcery.com> + + * doc/invoke.texi (MIPS Options): Update documentation of the + floating-point multiply-accumulate instruction restrictions. + 2013-02-21 Kostya Serebryany <kcc@google.com> * config/i386/i386.c (ix86_asan_shadow_offset): Use 0x7fff8000 as diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 3b43fd0..cadee04 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -16440,10 +16440,12 @@ Enable (disable) use of the floating-point multiply-accumulate instructions, when they are available. The default is @option{-mfused-madd}. -When multiply-accumulate instructions are used, the intermediate -product is calculated to infinite precision and is not subject to -the FCSR Flush to Zero bit. This may be undesirable in some -circumstances. +On the R8000 CPU when multiply-accumulate instructions are used, +the intermediate product is calculated to infinite precision +and is not subject to the FCSR Flush to Zero bit. This may be +undesirable in some circumstances. On other processors the result +is numerically identical to the equivalent computation using +separate multiply, add, subtract and negate instructions. @item -nocpp @opindex nocpp |