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target-mips: implement FPU Flush-To-Zero mode

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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6914 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-03-28 22:22:40 +00:00
parent 36556b20c5
commit 41e0c70159
1 changed files with 5 additions and 0 deletions
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5
target-mips/op_helper.c
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@ -1879,6 +1879,9 @@ unsigned int ieee_rm[] = {
#define RESTORE_ROUNDING_MODE \ #define RESTORE_ROUNDING_MODE \
set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], &env->active_fpu.fp_status) set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], &env->active_fpu.fp_status)
#define RESTORE_FLUSH_MODE \
set_flush_to_zero((env->active_fpu.fcr31 & (1 << 24)) != 0, &env->active_fpu.fp_status);
target_ulong helper_cfc1 (uint32_t reg) target_ulong helper_cfc1 (uint32_t reg)
{ {
target_ulong t0; target_ulong t0;
@ -1934,6 +1937,8 @@ void helper_ctc1 (target_ulong t0, uint32_t reg)
} }
/* set rounding mode */ /* set rounding mode */
RESTORE_ROUNDING_MODE; RESTORE_ROUNDING_MODE;
/* set flush-to-zero mode */
RESTORE_FLUSH_MODE;
set_float_exception_flags(0, &env->active_fpu.fp_status); set_float_exception_flags(0, &env->active_fpu.fp_status);
if ((GET_FP_ENABLE(env->active_fpu.fcr31) | 0x20) & GET_FP_CAUSE(env->active_fpu.fcr31)) if ((GET_FP_ENABLE(env->active_fpu.fcr31) | 0x20) & GET_FP_CAUSE(env->active_fpu.fcr31))
helper_raise_exception(EXCP_FPE); helper_raise_exception(EXCP_FPE);