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[Qemu-devel] [PATCH v8 6/9] target-mips: Activate IEEE 754-2008 signalin
From: |
Aleksandar Markovic |
Subject: |
[Qemu-devel] [PATCH v8 6/9] target-mips: Activate IEEE 754-2008 signaling NaN bit meaning for MSA |
Date: |
Fri, 3 Jun 2016 20:43:12 +0200 |
From: Aleksandar Markovic <address@hidden>
Function msa_reset() is updated so that flag snan_bit_is_one is
properly set to 0.
By applying this patch, a number of incorrect MSA behaviors that
require IEEE 754-2008 compliance will be fixed. Those are behaviors
that (up to the moment of applying this patch) did not get the desired
functionality from SoftFloat library with respect to distinguishing
between quiet and signaling NaN, getting default NaN values (both
quiet and signaling), establishing if a floating point number is NaN
or not, etc.
Two examples:
* FMAX, FMIN will now correctly detect and propagate NaNs.
* FCLASS.D ans FCLASS.S will now correcty detect NaN flavors.
Signed-off-by: Aleksandar Markovic <address@hidden>
---
target-mips/translate_init.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/target-mips/translate_init.c b/target-mips/translate_init.c
index e81a831..a37d8bb 100644
--- a/target-mips/translate_init.c
+++ b/target-mips/translate_init.c
@@ -893,5 +893,6 @@ static void msa_reset(CPUMIPSState *env)
/* clear float_status nan mode */
set_default_nan_mode(0, &env->active_tc.msa_fp_status);
- set_snan_bit_is_one(1, &env->active_tc.msa_fp_status);
+ /* set proper signanling bit meaning ("1" means "quiet") */
+ set_snan_bit_is_one(0, &env->active_tc.msa_fp_status);
}
--
1.9.1
- [Qemu-devel] [PATCH v8 0/9] IEEE 754-2008 support for Mips, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 2/9] softfloat: Clean code format in fpu/softfloat-specialize.h, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 1/9] softfloat: Implement run-time-configurable meaning of signaling NaN bit, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 3/9] softfloat: For Mips only, correct default NaN values, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 5/9] linux-user: Update preprocessor constants for Mips-specific e_flags bits, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 4/9] softfloat: For Mips only, correct order in pickNaNMulAdd(), Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 6/9] target-mips: Activate IEEE 754-2008 signaling NaN bit meaning for MSA,
Aleksandar Markovic <=
- [Qemu-devel] [PATCH v8 7/9] target-mips: Add abs2008 flavor of <ABS|NEG>.<S|D>, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 8/9] target-mips: Add nan2008 flavor of <CEIL|CVT|FLOOR|ROUND|TRUNC>.<L|W>.<S|D>, Aleksandar Markovic, 2016/06/03
- [Qemu-devel] [PATCH v8 9/9] target-mips: Implement FCR31's R/W bitmask and related functionalities, Aleksandar Markovic, 2016/06/03