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| author | Peter Maydell <peter.maydell@linaro.org> | 2011-01-06 19:37:55 +0000 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-06 22:16:59 +0100 |
| commit | cecd8504b80148b66cdc1ce32046429bc3549090 (patch) | |
| tree | 7f466152770e05d0b3fbc099b286206158eef4b6 | |
| parent | b12c390b9108d44cb0b05900d6c11a73ee0e9cae (diff) | |
| download | qemu-cecd8504b80148b66cdc1ce32046429bc3549090.tar.gz qemu-cecd8504b80148b66cdc1ce32046429bc3549090.tar.bz2 qemu-cecd8504b80148b66cdc1ce32046429bc3549090.zip | |
target-arm: wire up the softfloat flush_input_to_zero flag
Wire up the new softfloat support for flushing input denormals
to zero on ARM. The FPSCR FZ bit enables flush-to-zero for
both inputs and outputs, but the reporting of when inputs are
flushed to zero is via a separate IDC bit rather than the UFC
(underflow) bit used when output denormals are flushed to zero.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
| -rw-r--r-- | target-arm/helper.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 05684a2f45..705b99f9cb 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2242,6 +2242,8 @@ static inline int vfp_exceptbits_from_host(int host_bits) target_bits |= 8; if (host_bits & float_flag_inexact) target_bits |= 0x10; + if (host_bits & float_flag_input_denormal) + target_bits |= 0x80; return target_bits; } @@ -2278,6 +2280,8 @@ static inline int vfp_exceptbits_to_host(int target_bits) host_bits |= float_flag_underflow; if (target_bits & 0x10) host_bits |= float_flag_inexact; + if (target_bits & 0x80) + host_bits |= float_flag_input_denormal; return host_bits; } @@ -2310,8 +2314,10 @@ void HELPER(vfp_set_fpscr)(CPUState *env, uint32_t val) } set_float_rounding_mode(i, &env->vfp.fp_status); } - if (changed & (1 << 24)) + if (changed & (1 << 24)) { set_flush_to_zero((val & (1 << 24)) != 0, &env->vfp.fp_status); + set_flush_inputs_to_zero((val & (1 << 24)) != 0, &env->vfp.fp_status); + } if (changed & (1 << 25)) set_default_nan_mode((val & (1 << 25)) != 0, &env->vfp.fp_status); |