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From: "Stefan Kanthak" <stefan.kanthak@nexgo.de>
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Subject: More additions for the math/i386 subtree
Date: Tue, 10 Dec 2019 22:48:18 +0100
Organization: Me, myself & IT
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Optimised branch-free implementations of fmax() and fmin() for i386

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

--- -/dev/null
+++ +/src/math/i386/fmax.S
@@ -0,0 +1,26 @@
+.global fmaxf
+.type fmaxf,@function
+fmaxf:
+        flds 4(%esp)
+        flds 8(%esp)
+        jmp 1f
+
+.global fmaxl
+.type fmaxl,@function
+fmaxl:
+        fldt 4(%esp)
+        fldt 16(%esp)
+        jmp 1f
+
+.global fmax
+.type fmax,@function
+fmax:
+        fldl 4(%esp)
+        fldl 12(%esp)
+1:      fucomi %st(0),%st(0)
+        fcmovu %st(1),%st(0)
+        fxch %st(1)
+        fucomi %st(1),%st(0)
+        fcmovu %st(1),%st(0)
+        fstp %st(1)
+        ret

--- -/dev/null
+++ +/src/math/i386/fmin.S
@@ -0,0 +1,26 @@
+.global fminf
+.type fminf,@function
+fminf:
+        flds 4(%esp)
+        flds 8(%esp)
+        jmp 1f
+
+.global fminl
+.type fminl,@function
+fminl:
+        fldt 4(%esp)
+        fldt 16(%esp)
+        jmp 1f
+
+.global fmin
+.type fmin,@function
+fmin:
+        fldl 4(%esp)
+        fldl 12(%esp)
+1:      fucomi %st(0),%st(0)
+        fcmovu %st(1),%st(0)
+        fucomi %st(1),%st(0)
+        fcmovu %st(1),%st(0)
+        fstp %st(1)
+        ret