From 75645496fa9cd73d7dd1965b055ca6b7ee7a291d Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Fri, 22 Sep 2006 11:36:17 +0000 Subject: [PATCH] add a note git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30581 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/README.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index 7d612d019b9..736d776fd87 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -7,3 +7,24 @@ Consider implementing a select with two conditional moves: cmp x, y moveq dst, a movne dst, b + +---------------------------------------------------------- + + +%tmp1 = shl int %b, ubyte %c +%tmp4 = add int %a, %tmp1 + +compiles to + +add r0, r0, r1, lsl r2 + +but + +%tmp1 = shl int %b, ubyte %c +%tmp4 = add int %tmp1, %a + +compiles to +mov r1, r1, lsl r2 +add r0, r1, r0 + +----------------------------------------------------------