diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2016-04-21 14:04:50 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:02:22 +0200 |
| commit | d728f6709bcc49c98097485e3561f1faaf52b4f3 (patch) | |
| tree | 145e9bc429080d43ab26ba67573aeaa735efa1c2 /arch/mips/math-emu/dp_maddf.c | |
| parent | 6162051e87f6ea785cb51ad99bdcf8eb0bd9cb07 (diff) | |
| download | linux-d728f6709bcc49c98097485e3561f1faaf52b4f3.tar.bz2 | |
MIPS: math-emu: Unify ieee754dp_m{add,sub}f
The code for emulating MIPSr6 madd.d & msub.d instructions has
previously been implemented as 2 different functions, namely
ieee754dp_maddf & ieee754dp_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 double precision variant,
removing the original ieee754dp_msubf in favor of reusing the code from
ieee754dp_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/13155/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu/dp_maddf.c')
| -rw-r--r-- | arch/mips/math-emu/dp_maddf.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/mips/math-emu/dp_maddf.c b/arch/mips/math-emu/dp_maddf.c index 119eda9fa1ea..d5e0fb13ef0f 100644 --- a/arch/mips/math-emu/dp_maddf.c +++ b/arch/mips/math-emu/dp_maddf.c @@ -14,8 +14,12 @@ #include "ieee754dp.h" -union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, - union ieee754dp y) +enum maddf_flags { + maddf_negate_product = 1 << 0, +}; + +static union ieee754dp _dp_maddf(union ieee754dp z, union ieee754dp x, + union ieee754dp y, enum maddf_flags flags) { int re; int rs; @@ -154,6 +158,8 @@ union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, re = xe + ye; rs = xs ^ ys; + if (flags & maddf_negate_product) + rs ^= 1; /* shunt to top of word */ xm <<= 64 - (DP_FBITS + 1); @@ -263,3 +269,15 @@ union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, return ieee754dp_format(zs, ze, zm); } + +union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, + union ieee754dp y) +{ + return _dp_maddf(z, x, y, 0); +} + +union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, + union ieee754dp y) +{ + return _dp_maddf(z, x, y, maddf_negate_product); +} |