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| author | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-14 20:39:18 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-14 20:39:18 +0100 |
| commit | a0d4ac333a8e59152c48ce659dc831391fff6df3 (patch) | |
| tree | 5fb8809b8de58d13d445e7191416cc1c31d76d2c | |
| parent | 26ac1ea5590c2710d050bfe2630c1546f109d28c (diff) | |
| download | qemu-a0d4ac333a8e59152c48ce659dc831391fff6df3.zip | |
target-sh4: implement flush-to-zero
When the FPSCR.DN bit is set, the SH4 FPU treat denormalized numbers as
zero. Enable the corresponding softfloat option when this bit is set.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
| -rw-r--r-- | target-sh4/op_helper.c | 1 | ||||
| -rw-r--r-- | target-sh4/translate.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/target-sh4/op_helper.c b/target-sh4/op_helper.c index d69b94b0b1..9025a2916a 100644 --- a/target-sh4/op_helper.c +++ b/target-sh4/op_helper.c @@ -449,6 +449,7 @@ void helper_ld_fpscr(uint32_t val) } else { set_float_rounding_mode(float_round_nearest_even, &env->fp_status); } + set_flush_to_zero((val & FPSCR_DN) != 0, &env->fp_status); } uint32_t helper_fabs_FT(uint32_t t0) diff --git a/target-sh4/translate.c b/target-sh4/translate.c index d4cd0a3f86..8b2f1fc3ed 100644 --- a/target-sh4/translate.c +++ b/target-sh4/translate.c @@ -205,6 +205,7 @@ static void cpu_sh4_reset(CPUSH4State * env) #else env->fpscr = FPSCR_DN | FPSCR_RM_ZERO; /* CPU reset value according to SH4 manual */ set_float_rounding_mode(float_round_to_zero, &env->fp_status); + set_flush_to_zero(1, &env->fp_status); #endif set_default_nan_mode(1, &env->fp_status); env->mmucr = 0; |