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MIPS: math-emu: Optimise qNaN handling in `ieee754sp_fdp' 

Rewrite qNaN handling in `ieee754sp_fdp' using the `ieee754_class_nan'
helper recently added, removing the external call to `ieee754sp_isnan'
and reducing the size of code by 16 instructions or 64 bytes.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9692/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:25:52 +01:00 committed by Ralf Baechle
parent 42fa242421
commit b0c2f8fbdb
1 changed files with 7 additions and 5 deletions
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12
arch/mips/math-emu/sp_fdp.c
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@ -30,10 +30,11 @@ static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm)
union ieee754sp ieee754sp_fdp(union ieee754dp x) union ieee754sp ieee754sp_fdp(union ieee754dp x)
{ {
union ieee754sp y;
u32 rm; u32 rm;
COMPXDP; COMPXDP;
union ieee754sp nan; COMPYSP;
EXPLODEXDP; EXPLODEXDP;
@ -46,10 +47,11 @@ union ieee754sp ieee754sp_fdp(union ieee754dp x)
return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm)); return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm));
case IEEE754_CLASS_QNAN: case IEEE754_CLASS_QNAN:
nan = ieee754sp_nan_fdp(xs, xm); y = ieee754sp_nan_fdp(xs, xm);
if (!ieee754sp_isnan(nan)) EXPLODEYSP;
nan = ieee754sp_indef(); if (!ieee754_class_nan(yc))
return nan; y = ieee754sp_indef();
return y;
case IEEE754_CLASS_INF: case IEEE754_CLASS_INF:
return ieee754sp_inf(xs); return ieee754sp_inf(xs);