diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2016-04-21 14:04:49 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:02:22 +0200 |
| commit | 6162051e87f6ea785cb51ad99bdcf8eb0bd9cb07 (patch) | |
| tree | dcbed0ce8143e823e3cd3ba8db3810b89861705e /arch/mips/math-emu/sp_maddf.c | |
| parent | 4b820d95dc53c15e6e727da964430a3ed60e05ef (diff) | |
MIPS: math-emu: Unify ieee754sp_m{add,sub}f
The code for emulating MIPSr6 madd.s & msub.s instructions has
previously been implemented as 2 different functions, namely
ieee754sp_maddf & ieee754sp_msubf. The difference in behaviour of these
2 instructions is merely the sign of the product, so we can easily share
the code implementing them. Do this for the single precision variant,
removing the original ieee754sp_msubf in favor of reusing the code from
ieee754sp_maddf.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13154/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu/sp_maddf.c')
| -rw-r--r-- | arch/mips/math-emu/sp_maddf.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/mips/math-emu/sp_maddf.c b/arch/mips/math-emu/sp_maddf.c index dd1dd83e34eb..93b7132d60e2 100644 --- a/arch/mips/math-emu/sp_maddf.c +++ b/arch/mips/math-emu/sp_maddf.c @@ -14,8 +14,12 @@ #include "ieee754sp.h" -union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, - union ieee754sp y) +enum maddf_flags { + maddf_negate_product = 1 << 0, +}; + +static union ieee754sp _sp_maddf(union ieee754sp z, union ieee754sp x, + union ieee754sp y, enum maddf_flags flags) { int re; int rs; @@ -154,6 +158,8 @@ union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, re = xe + ye; rs = xs ^ ys; + if (flags & maddf_negate_product) + rs ^= 1; /* shunt to top of word */ xm <<= 32 - (SP_FBITS + 1); @@ -253,3 +259,15 @@ union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, } return ieee754sp_format(zs, ze, zm); } + +union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, + union ieee754sp y) +{ + return _sp_maddf(z, x, y, 0); +} + +union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, + union ieee754sp y) +{ + return _sp_maddf(z, x, y, maddf_negate_product); +} |