From 0ecb606cb6cf65de1d9fc8a919bceb4be476c602 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 12 Jul 2007 18:26:36 +0000
Subject: 2.5-18.1

---
 sysdeps/i386/fpu/e_powf.S | 41 ++++++++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 11 deletions(-)

(limited to 'sysdeps/i386/fpu/e_powf.S')

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
 
-- 
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