From: Ehsan Amiri <amehsan@ca.ibm.com>
Date: Fri, 18 Mar 2016 04:02:25 +0000 (+0000)
Subject: adding another optimization opportunity to readme file
X-Git-Tag: llvmorg-3.9.0-rc1~11481
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=631ed04af04d349eb4886e17ddc688e496eac8cc;p=platform%2Fupstream%2Fllvm.git

adding another optimization opportunity to readme file

llvm-svn: 263775
---

diff --git a/llvm/lib/Target/PowerPC/README.txt b/llvm/lib/Target/PowerPC/README.txt
index 01233ae..f1d4ca7 100644
--- a/llvm/lib/Target/PowerPC/README.txt
+++ b/llvm/lib/Target/PowerPC/README.txt
@@ -589,6 +589,17 @@ entry:
 	%tmp34 = zext i1 %tmp3 to i32		; <i32> [#uses=1]
 	ret i32 %tmp34
 }
+
+//===---------------------------------------------------------------------===//
+for the following code:
+
+void foo (float *__restrict__ a, int *__restrict__ b, int n) {
+      a[n] = b[n]  * 2.321;
+}
+
+we load b[n] to GPR, then move it VSX register and convert it float. We should 
+use vsx scalar integer load instructions to avoid direct moves
+
 //===----------------------------------------------------------------------===//
 ; RUN: llvm-as < %s | llc -march=ppc32 | not grep fneg