aboutsummaryrefslogtreecommitdiff
path: root/target
diff options
context:
space:
mode:
authorRichard Henderson <richard.henderson@linaro.org>2018-08-16 14:05:29 +0100
committerPeter Maydell <peter.maydell@linaro.org>2018-08-16 14:29:58 +0100
commit19062c169e5bcdda3d60df9161228e107bf0f96e (patch)
tree29f29ead619f3c62856f17a29aed82ca983fa818 /target
parent0b62159be33d45d00dfa34a317c6d3da30ffb480 (diff)
target/arm: Ignore float_flag_input_denormal from fp_status_f16
When FZ is set, input_denormal exceptions are recognized, but this does not happen with FZ16. The softfloat code has no way to distinguish these bits and will raise such exceptions into fp_status_f16.flags, so ignore them when computing the accumulated flags. Cc: qemu-stable@nongnu.org (3.0.1) Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com> Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com> Message-id: 20180810193129.1556-3-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target')
-rw-r--r--target/arm/helper.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 0fc6d2e213..a3124082a6 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -11312,9 +11312,13 @@ uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env)
fpscr = (env->vfp.xregs[ARM_VFP_FPSCR] & 0xffc8ffff)
| (env->vfp.vec_len << 16)
| (env->vfp.vec_stride << 20);
+
i = get_float_exception_flags(&env->vfp.fp_status);
i |= get_float_exception_flags(&env->vfp.standard_fp_status);
- i |= get_float_exception_flags(&env->vfp.fp_status_f16);
+ /* FZ16 does not generate an input denormal exception. */
+ i |= (get_float_exception_flags(&env->vfp.fp_status_f16)
+ & ~float_flag_input_denormal);
+
fpscr |= vfp_exceptbits_from_host(i);
return fpscr;
}