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target-i386: fix helper_fscale() wrt softfloat 

Use the scalbn softfloat function to implement helper_fscale(). This
fixes corner cases (e.g. NaN) and makes a few more GNU libc math tests
to pass.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2011-04-20 13:04:23 +02:00
parent 4cc5383f80
commit be1c17c7fd
2 changed files with 10 additions and 1 deletions
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4
target-i386/exec.h
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@ -115,9 +115,11 @@ static inline void svm_check_intercept(uint32_t type)
#define floatx_sub floatx80_sub #define floatx_sub floatx80_sub
#define floatx_abs floatx80_abs #define floatx_abs floatx80_abs
#define floatx_chs floatx80_chs #define floatx_chs floatx80_chs
#define floatx_scalbn floatx80_scalbn
#define floatx_round_to_int floatx80_round_to_int #define floatx_round_to_int floatx80_round_to_int
#define floatx_compare floatx80_compare #define floatx_compare floatx80_compare
#define floatx_compare_quiet floatx80_compare_quiet #define floatx_compare_quiet floatx80_compare_quiet
#define floatx_is_any_nan floatx80_is_any_nan
#else #else
#define floatx_to_int32 float64_to_int32 #define floatx_to_int32 float64_to_int32
#define floatx_to_int64 float64_to_int64 #define floatx_to_int64 float64_to_int64
@ -134,9 +136,11 @@ static inline void svm_check_intercept(uint32_t type)
#define floatx_sub float64_sub #define floatx_sub float64_sub
#define floatx_abs float64_abs #define floatx_abs float64_abs
#define floatx_chs float64_chs #define floatx_chs float64_chs
#define floatx_scalbn float64_scalbn
#define floatx_round_to_int float64_round_to_int #define floatx_round_to_int float64_round_to_int
#define floatx_compare float64_compare #define floatx_compare float64_compare
#define floatx_compare_quiet float64_compare_quiet #define floatx_compare_quiet float64_compare_quiet
#define floatx_is_any_nan float64_is_any_nan
#endif #endif
#define RC_MASK 0xc00 #define RC_MASK 0xc00

7
target-i386/op_helper.c
View File

@ -4174,7 +4174,12 @@ void helper_frndint(void)
void helper_fscale(void) void helper_fscale(void)
{ {
ST0 = ldexp (ST0, (int)(ST1)); if (floatx_is_any_nan(ST1)) {
ST0 = ST1;
} else {
int n = floatx_to_int32_round_to_zero(ST1, &env->fp_status);
ST0 = floatx_scalbn(ST0, n, &env->fp_status);
}
} }
void helper_fsin(void) void helper_fsin(void)