From: Maciej W. Rozycki Date: Fri, 3 Apr 2015 22:25:52 +0000 (+0100) Subject: MIPS: math-emu: Optimise qNaN handling in `ieee754sp_fdp' X-Git-Tag: v4.13~5381^2~30 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b0c2f8fbdb52b95b969c96994bcab7c084530199;p=mirror_ubuntu-bionic-kernel.git 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 Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9692/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/math-emu/sp_fdp.c b/arch/mips/math-emu/sp_fdp.c index 152637093854..3797148893ad 100644 --- a/arch/mips/math-emu/sp_fdp.c +++ b/arch/mips/math-emu/sp_fdp.c @@ -30,10 +30,11 @@ static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm) union ieee754sp ieee754sp_fdp(union ieee754dp x) { + union ieee754sp y; u32 rm; COMPXDP; - union ieee754sp nan; + COMPYSP; EXPLODEXDP; @@ -46,10 +47,11 @@ union ieee754sp ieee754sp_fdp(union ieee754dp x) return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm)); case IEEE754_CLASS_QNAN: - nan = ieee754sp_nan_fdp(xs, xm); - if (!ieee754sp_isnan(nan)) - nan = ieee754sp_indef(); - return nan; + y = ieee754sp_nan_fdp(xs, xm); + EXPLODEYSP; + if (!ieee754_class_nan(yc)) + y = ieee754sp_indef(); + return y; case IEEE754_CLASS_INF: return ieee754sp_inf(xs);