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From: "Stefan Kanthak" <stefan.kanthak@nexgo.de>
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Subject: An addition to the math subtree
Date: Tue, 10 Dec 2019 17:58:40 +0100
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Optimised implementations of copysign() for i386

JFTR: I'm NOT subscribed to your mailing list, so CC: me in replies!

--- -/dev/null
+++ +/src/math/i386/copysign.S
@@ -0,0 +1,26 @@
+.global copysignf
+.type copysignf,@function
+copysignf:
+        shlb $1,4+3(%esp)
+        shlb $1,8+3(%esp)
+        rcrb $1,4+3(%esp)
+        flds 4(%esp)
+        ret
+
+.global copysignl
+.type copysignl,@function
+copysignl:
+        shlb $1,4+9(%esp)
+        shlb $1,16+9(%esp)
+        rcrb $1,4+9(%esp)
+        fldt 4(%esp)
+        ret
+
+.global copysign
+.type copysign,@function
+copysign:
+        shlb $1,4+7(%esp)
+        shlb $1,12+7(%esp)
+        rcrb $1,4+7(%esp)
+        fldl 4(%esp)
+        ret