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authorMaciej W. Rozycki <macro@linux-mips.org>2015-04-03 23:25:18 +0100
committerRalf Baechle <ralf@linux-mips.org>2015-04-08 01:09:23 +0200
commitec98f9a01ffb23ea72471ccbc8c390c8c2e4c0b3 (patch)
tree585632947155b10025a4beaa749c9fd7cc9c8f7e
parent1f6d2c29b08bbd29a3d3b8476e9a26546e03104e (diff)
downloadlinux-stericsson-ec98f9a01ffb23ea72471ccbc8c390c8c2e4c0b3.tar.gz
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 <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/math-emu/ieee754dp.c11
-rw-r--r--arch/mips/math-emu/ieee754sp.c11
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;
}