[Qemu-stable] [PATCH 14/97] target/arm: Ignore float_flag_input_denormal from fp_status_f16

[Michael Roth]

From: Richard Henderson <address@hidden>

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: address@hidden (3.0.1)
Reported-by: Laurent Desnogues <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Laurent Desnogues <address@hidden>
Tested-by: Laurent Desnogues <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
(cherry picked from commit 19062c169e5bcdda3d60df9161228e107bf0f96e)
Signed-off-by: Michael Roth <address@hidden>
---
 target/arm/helper.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index c2287c76e5..991b077e8f 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -11283,9 +11283,13 @@ 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;
 }
-- 
2.17.1