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[Qemu-devel] [PATCH 6/9] target-sh4: implement flush-to-zero
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH 6/9] target-sh4: implement flush-to-zero |
Date: |
Tue, 11 Jan 2011 22:01:35 +0100 |
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 <address@hidden>
---
target-sh4/op_helper.c | 1 +
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 9915e42..76a40bd 100644
--- a/target-sh4/op_helper.c
+++ b/target-sh4/op_helper.c
@@ -434,6 +434,7 @@ 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 bdfa31a..080ff6e 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;
--
1.7.2.3
[Qemu-devel] [PATCH 5/9] target-sh4: define FPSCR constants, Aurelien Jarno, 2011/01/11
[Qemu-devel] [PATCH 9/9] target-sh4: add ftrv instruction, Aurelien Jarno, 2011/01/11
[Qemu-devel] [PATCH 8/9] target-sh4: add fipr instruction, Aurelien Jarno, 2011/01/11
[Qemu-devel] [PATCH 7/9] target-sh4: implement FPU exceptions, Aurelien Jarno, 2011/01/11
[Qemu-devel] [PATCH 6/9] target-sh4: implement flush-to-zero,
Aurelien Jarno <=
[Qemu-devel] [PATCH 3/9] softfloat: fix default-NaN mode, Aurelien Jarno, 2011/01/11
[Qemu-devel] [PATCH 2/9] softfloat: SH4 has the sNaN bit set, Aurelien Jarno, 2011/01/11