[llvm-commits] [llvm] r129527 - /llvm/trunk/lib/Target/X86/README.txt

[Chris Lattner]

Author: lattner
Date: Thu Apr 14 13:47:18 2011
New Revision: 129527

URL: http://llvm.org/viewvc/llvm-project?rev=129527&view=rev
Log:
move PR9661 out to here.

Modified:
    llvm/trunk/lib/Target/X86/README.txt

Modified: llvm/trunk/lib/Target/X86/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=129527&r1=129526&r2=129527&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Thu Apr 14 13:47:18 2011
@@ -2016,3 +2016,27 @@
 We could save an instruction here by commuting the addss.
 
 //===---------------------------------------------------------------------===//
+
+This (from PR9661):
+
+float clamp_float(float a) {
+        if (a > 1.0f)
+                return 1.0f;
+        else if (a < 0.0f)
+                return 0.0f;
+        else
+                return a;
+}
+
+Could compile to:
+
+clamp_float:                            # @clamp_float
+        movss   .LCPI0_0(%rip), %xmm1
+        minss   %xmm1, %xmm0
+        pxor    %xmm1, %xmm1
+        maxss   %xmm1, %xmm0
+        ret
+
+with -ffast-math.
+
+//===---------------------------------------------------------------------===//