From b8295f7a0ecb212e2ccc17eaf38fc949fd17943d Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 14 Apr 2011 18:47:18 +0000
Subject: [PATCH] move PR9661 out to here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129527 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/README.txt | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 1ac2305e82b..07722f44ec3 100644
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -2016,3 +2016,27 @@ We currently generate:
 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.
+
+//===---------------------------------------------------------------------===//