diff options
Diffstat (limited to 'sysdeps/i386/fpu/e_powf.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_powf.S | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/sysdeps/i386/fpu/e_powf.S b/sysdeps/i386/fpu/e_powf.S index b3fa624f4d..c91545418d 100644 --- a/sysdeps/i386/fpu/e_powf.S +++ b/sysdeps/i386/fpu/e_powf.S @@ -1,5 +1,6 @@ /* ix87 specific implementation of pow function. - Copyright (C) 1996, 1997, 1999, 2001, 2004 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1999, 2001, 2004, 2005, 2007 + Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -66,9 +67,7 @@ ENTRY(__ieee754_powf) fxam #ifdef PIC - call 1f -1: popl %ecx - addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx + LOAD_PIC_REG (cx) #endif fnstsw @@ -86,6 +85,7 @@ ENTRY(__ieee754_powf) flds 4(%esp) // x : y subl $4, %esp + cfi_adjust_cfa_offset (4) fxam fnstsw @@ -119,6 +119,7 @@ ENTRY(__ieee754_powf) /* OK, we have an integer value for y. */ popl %edx + cfi_adjust_cfa_offset (-4) orl $0, %edx fstp %st(0) // x jns 4f // y >= 0, jump @@ -149,14 +150,16 @@ ENTRY(__ieee754_powf) 31: fstp %st(1) ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) 2: /* y is a real number. */ fxch // x : y fldl MO(one) // 1.0 : x : y - fld %st(1) // x : 1.0 : x : y - fsub %st(1) // x-1 : 1.0 : x : y - fabs // |x-1| : 1.0 : x : y - fcompl MO(limit) // 1.0 : x : y + fldl MO(limit) // 0.29 : 1.0 : x : y + fld %st(2) // x : 0.29 : 1.0 : x : y + fsub %st(2) // x-1 : 0.29 : 1.0 : x : y + fabs // |x-1| : 0.29 : 1.0 : x : y + fucompp // 1.0 : x : y fnstsw fxch // x : 1.0 : y sahf @@ -175,6 +178,7 @@ ENTRY(__ieee754_powf) faddl MO(one) // 2^fract(y*log2(x)) : int(y*log2(x)) fscale // 2^fract(y*log2(x))*2^int(y*log2(x)) : int(y*log2(x)) addl $4, %esp + cfi_adjust_cfa_offset (-4) fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x)) ret @@ -188,9 +192,10 @@ ENTRY(__ieee754_powf) // y == ±inf .align ALIGNARG(4) 12: fstp %st(0) // pop y - flds 4(%esp) // x - fabs - fcompl MO(one) // < 1, == 1, or > 1 + fldl MO(one) // 1 + flds 4(%esp) // x : 1 + fabs // abs(x) : 1 + fucompp // < 1, == 1, or > 1 fnstsw andb $0x45, %ah cmpb $0x45, %ah @@ -213,6 +218,7 @@ ENTRY(__ieee754_powf) 13: flds 4(%esp) // load x == NaN ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) // x is ±inf 15: fstp %st(0) // y @@ -231,6 +237,7 @@ ENTRY(__ieee754_powf) // OK, the value is an integer, but is the number of bits small // enough so that all are coming from the mantissa? popl %edx + cfi_adjust_cfa_offset (-4) testb $1, %dl jz 18f // jump if not odd movl %edx, %eax @@ -244,22 +251,27 @@ ENTRY(__ieee754_powf) fldl MOX(minf_mzero, %edx, 8) ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) 16: fcompl MO(zero) addl $4, %esp + cfi_adjust_cfa_offset (-4) fnstsw shrl $5, %eax andl $8, %eax fldl MOX(inf_zero, %eax, 1) ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) 17: shll $30, %edx // sign bit for y in right position addl $4, %esp + cfi_adjust_cfa_offset (-4) 18: shrl $31, %edx fldl MOX(inf_zero, %edx, 8) ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) // x is ±0 20: fstp %st(0) // y @@ -281,6 +293,7 @@ ENTRY(__ieee754_powf) // OK, the value is an integer, but is the number of bits small // enough so that all are coming from the mantissa? popl %edx + cfi_adjust_cfa_offset (-4) testb $1, %dl jz 27f // jump if not odd cmpl $0xff000000, %edx @@ -292,13 +305,16 @@ ENTRY(__ieee754_powf) fchs ret + cfi_adjust_cfa_offset (4) 25: fstp %st(0) 26: addl $4, %esp + cfi_adjust_cfa_offset (-4) 27: // Raise divide-by-zero exception and get infinity value. fldl MO(one) fdivl MO(zero) ret + cfi_adjust_cfa_offset (4) .align ALIGNARG(4) // x is ±0 and y is > 0. We must find out whether y is an odd integer. 21: testb $2, %dh @@ -315,6 +331,7 @@ ENTRY(__ieee754_powf) // OK, the value is an integer, but is the number of bits small // enough so that all are coming from the mantissa? popl %edx + cfi_adjust_cfa_offset (-4) testb $1, %dl jz 24f // jump if not odd cmpl $0xff000000, %edx @@ -323,8 +340,10 @@ ENTRY(__ieee754_powf) fldl MO(mzero) ret + cfi_adjust_cfa_offset (4) 22: fstp %st(0) 23: addl $4, %esp // Don't use pop. + cfi_adjust_cfa_offset (-4) 24: fldl MO(zero) ret |