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target/i386: Set default NaN pattern explicitly

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Set the default NaN pattern explicitly, and remove the ifdef from
parts64_default_nan().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-38-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-12-11 15:31:04 +00:00
parent 223f4f2e78
commit f69da79196
2 changed files with 4 additions and 3 deletions
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3
fpu/softfloat-specialize.c.inc
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@ -139,9 +139,6 @@ static void parts64_default_nan(FloatParts64 *p, float_status *status)
#if defined(TARGET_SPARC) || defined(TARGET_M68K)
/* Sign bit clear, all frac bits set */
dnan_pattern = 0b01111111;
#elif defined(TARGET_I386) || defined(TARGET_X86_64)
/* Sign bit set, most significant frac bit set */
dnan_pattern = 0b11000000;
#elif defined(TARGET_HPPA)
/* Sign bit clear, msb-1 frac bit set */
dnan_pattern = 0b00100000;

4
target/i386/tcg/fpu_helper.c
View file

@ -181,6 +181,10 @@ void cpu_init_fp_statuses(CPUX86State *env)
*/
set_float_infzeronan_rule(float_infzeronan_dnan_never, &env->sse_status);
set_float_3nan_prop_rule(float_3nan_prop_abc, &env->sse_status);
/* Default NaN: sign bit set, most significant frac bit set */
set_float_default_nan_pattern(0b11000000, &env->fp_status);
set_float_default_nan_pattern(0b11000000, &env->mmx_status);
set_float_default_nan_pattern(0b11000000, &env->sse_status);
}
static inline uint8_t save_exception_flags(CPUX86State *env)