From ec98f9a01ffb23ea72471ccbc8c390c8c2e4c0b3 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Fri, 3 Apr 2015 23:25:18 +0100 Subject: [PATCH] MIPS: math-emu: Update sNaN quieting handlers Commit fdffbafb [Lots of FPU bug fixes from Kjeld Borch Egevang.] replaced the two single `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' places, where sNaN quieting used to happen for single and double floating-point operations respectively, with individual qNaN instantiations across all the call sites instead. It also made most of these two functions dead code as where called on a qNaN they return right away. To revert the damage and make sNaN quieting uniform again first rewrite `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' to do the same quieting all the call sites do, that is return the default qNaN encoding for all input sNaN values; never propagate any sNaN payload bits from its trailing significand field. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9685/ Signed-off-by: Ralf Baechle --- arch/mips/math-emu/ieee754dp.c | 11 +++-------- arch/mips/math-emu/ieee754sp.c | 11 +++-------- 2 files changed, 6 insertions(+), 16 deletions(-) diff --git a/arch/mips/math-emu/ieee754dp.c b/arch/mips/math-emu/ieee754dp.c index 068f45a415fc..9723a518e5ad 100644 --- a/arch/mips/math-emu/ieee754dp.c +++ b/arch/mips/math-emu/ieee754dp.c @@ -49,14 +49,9 @@ union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp r) if (!ieee754dp_issnan(r)) /* QNAN does not cause invalid op !! */ return r; - if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) { - /* not enabled convert to a quiet NaN */ - DPMANT(r) &= (~DP_MBIT(DP_FBITS-1)); - if (ieee754dp_isnan(r)) - return r; - else - return ieee754dp_indef(); - } + /* If not enabled convert to a quiet NaN. */ + if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) + return ieee754dp_indef(); return r; } diff --git a/arch/mips/math-emu/ieee754sp.c b/arch/mips/math-emu/ieee754sp.c index ba88301579c2..7bde3c204d02 100644 --- a/arch/mips/math-emu/ieee754sp.c +++ b/arch/mips/math-emu/ieee754sp.c @@ -49,14 +49,9 @@ union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp r) if (!ieee754sp_issnan(r)) /* QNAN does not cause invalid op !! */ return r; - if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) { - /* not enabled convert to a quiet NaN */ - SPMANT(r) &= (~SP_MBIT(SP_FBITS-1)); - if (ieee754sp_isnan(r)) - return r; - else - return ieee754sp_indef(); - } + /* If not enabled convert to a quiet NaN. */ + if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) + return ieee754sp_indef(); return r; } -- 2.20.1