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authorAurelien Jarno <aurelien@aurel32.net>2011-01-14 20:39:18 +0100
committerAurelien Jarno <aurelien@aurel32.net>2011-01-14 20:39:18 +0100
commita0d4ac333a8e59152c48ce659dc831391fff6df3 (patch)
tree5fb8809b8de58d13d445e7191416cc1c31d76d2c /target-sh4
parent26ac1ea5590c2710d050bfe2630c1546f109d28c (diff)
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>
Diffstat (limited to 'target-sh4')
-rw-r--r--target-sh4/op_helper.c1
-rw-r--r--target-sh4/translate.c1
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;