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From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Thu, 26 Jul 2018 14:42:20 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r336739 - head/lib/libc/powerpcspe/gen
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Author: jhibbits
Date: Thu Jul 26 14:42:20 2018
New Revision: 336739
URL: https://svnweb.freebsd.org/changeset/base/336739

Log:
  Fix fabs(3) for powerpcspe, this time for real
  
  SPE ABI uses the soft-float ABI, which splits doubles into two words.  As such,
  fabs(3) cannot work on a double directly.  It's too costly to convert the
  argument pair into a single double to use efdabs, so clear the top bit of the
  high word, which is the sign bit.

Modified:
  head/lib/libc/powerpcspe/gen/fabs.S

Modified: head/lib/libc/powerpcspe/gen/fabs.S
==============================================================================
--- head/lib/libc/powerpcspe/gen/fabs.S	Thu Jul 26 14:15:04 2018	(r336738)
+++ head/lib/libc/powerpcspe/gen/fabs.S	Thu Jul 26 14:42:20 2018	(r336739)
@@ -31,7 +31,8 @@ __FBSDID("$FreeBSD$");
  * double fabs(double)
  */
 ENTRY(fabs)
-	efdabs	%r3,%r3
+	/* arg is split in two words, clear sign bit only, in r3. */
+	clrlwi	%r3,%r3,1
 	blr
 END(fabs)