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From: Tijl Coosemans <tijl@FreeBSD.org>
Date: Sun, 16 Sep 2012 16:58:49 +0000 (UTC)
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Subject: svn commit: r240566 - head/lib/msun/i387
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Author: tijl
Date: Sun Sep 16 16:58:49 2012
New Revision: 240566
URL: http://svn.freebsd.org/changeset/base/240566

Log:
  Optimise i387 trigonometric functions. Replace "andw 0x400,%ax \ jnz" with
  "sahf \ jp", "fprem1" with "fprem" and "fstsw %ax" with "fnstsw %ax".

Modified:
  head/lib/msun/i387/s_cos.S
  head/lib/msun/i387/s_sin.S
  head/lib/msun/i387/s_tan.S

Modified: head/lib/msun/i387/s_cos.S
==============================================================================
--- head/lib/msun/i387/s_cos.S	Sun Sep 16 16:08:20 2012	(r240565)
+++ head/lib/msun/i387/s_cos.S	Sun Sep 16 16:58:49 2012	(r240566)
@@ -40,16 +40,16 @@ ENTRY(cos)
 	fldl	4(%esp)
 	fcos
 	fnstsw	%ax
-	andw	$0x400,%ax
-	jnz	1f
+	sahf
+	jp	1f
 	ret	
 1:	fldpi
 	fadd	%st(0)
 	fxch	%st(1)
-2:	fprem1
+2:	fprem
 	fnstsw	%ax
-	andw	$0x400,%ax
-	jnz	2b
+	sahf
+	jp	2b
 	fstp	%st(1)
 	fcos
 	ret

Modified: head/lib/msun/i387/s_sin.S
==============================================================================
--- head/lib/msun/i387/s_sin.S	Sun Sep 16 16:08:20 2012	(r240565)
+++ head/lib/msun/i387/s_sin.S	Sun Sep 16 16:58:49 2012	(r240566)
@@ -40,16 +40,16 @@ ENTRY(sin)
 	fldl	4(%esp)
 	fsin
 	fnstsw	%ax
-	andw	$0x400,%ax
-	jnz	1f
+	sahf
+	jp	1f
 	ret
 1:	fldpi
 	fadd	%st(0)
 	fxch	%st(1)
-2:	fprem1
+2:	fprem
 	fnstsw	%ax
-	andw	$0x400,%ax
-	jnz	2b
+	sahf
+	jp	2b
 	fstp	%st(1)
 	fsin
 	ret

Modified: head/lib/msun/i387/s_tan.S
==============================================================================
--- head/lib/msun/i387/s_tan.S	Sun Sep 16 16:08:20 2012	(r240565)
+++ head/lib/msun/i387/s_tan.S	Sun Sep 16 16:58:49 2012	(r240566)
@@ -40,17 +40,17 @@ ENTRY(tan)
 	fldl	4(%esp)
 	fptan
 	fnstsw	%ax
-	andw	$0x400,%ax
-	jnz	1f
+	sahf
+	jp	1f
 	fstp	%st(0)
 	ret
 1:	fldpi
 	fadd	%st(0)
 	fxch	%st(1)
-2:	fprem1
-	fstsw	%ax
-	andw	$0x400,%ax
-	jnz	2b
+2:	fprem
+	fnstsw	%ax
+	sahf
+	jp	2b
 	fstp	%st(1)
 	fptan
 	fstp	%st(0)