From c0da9c377c3b2099c3dd8f28864abce6304889dd Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Thu, 21 Feb 2013 14:06:52 +0000 Subject: 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 --- gcc/ChangeLog | 5 +++++ gcc/doc/invoke.texi | 10 ++++++---- 2 files changed, 11 insertions(+), 4 deletions(-) (limited to 'gcc') 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 + + * doc/invoke.texi (MIPS Options): Update documentation of the + floating-point multiply-accumulate instruction restrictions. + 2013-02-21 Kostya Serebryany * 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 -- cgit v1.1