From a0d4ac333a8e59152c48ce659dc831391fff6df3 Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Fri, 14 Jan 2011 20:39:18 +0100 Subject: 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 --- target-sh4/op_helper.c | 1 + target-sh4/translate.c | 1 + 2 files changed, 2 insertions(+) (limited to 'target-sh4') 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; -- cgit v1.2.3