diff options
Diffstat (limited to 'sysdeps/i386/fpu/e_exp2f.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_exp2f.S | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/e_exp2f.S b/sysdeps/i386/fpu/e_exp2f.S index f867d0d472..042c83b1ef 100644 --- a/sysdeps/i386/fpu/e_exp2f.S +++ b/sysdeps/i386/fpu/e_exp2f.S @@ -6,7 +6,24 @@ #include <machine/asm.h> + .section .rodata.cst4,"aM",@progbits,4 + + .p2align 2 + .type flt_min,@object +flt_min: .byte 0, 0, 0x80, 0 + ASM_SIZE_DIRECTIVE(flt_min) + +#ifdef PIC +# define MO(op) op##@GOTOFF(%ecx) +#else +# define MO(op) op +#endif + + .text ENTRY(__ieee754_exp2f) +#ifdef PIC + LOAD_PIC_REG (cx) +#endif flds 4(%esp) /* I added the following ugly construct because exp(+-Inf) resulted in NaN. The ugliness results from the bright minds at Intel. @@ -27,7 +44,22 @@ ENTRY(__ieee754_exp2f) faddp /* 2^(fract(x)) */ fscale /* e^x */ fstp %st(1) - ret + flds MO(flt_min) + fld %st(1) + fucompp + fnstsw + sahf + jnc 3f + subl $4, %esp + cfi_adjust_cfa_offset (4) + fld %st(0) + fmul %st(0) + fstps (%esp) + fstps (%esp) + flds (%esp) + addl $4, %esp + cfi_adjust_cfa_offset (-4) +3: ret 1: testl $0x200, %eax /* Test sign. */ jz 2f /* If positive, jump. */ |