[llvm-commits] [llvm] r74355 - in /llvm/trunk: lib/Target/ARM/ARMInstrThumb2.td test/CodeGen/Thumb2/thumb2-mvn2.ll

[David Goodwin]

Author: david_goodwin
Date: Fri Jun 26 18:13:13 2009
New Revision: 74355

URL: http://llvm.org/viewvc/llvm-project?rev=74355&view=rev
Log:
When possible, use "mvn ra, rb" instead of "eor ra, rb, -1" because mvn has a narrow version and eor(i) does not.

Added:
    llvm/trunk/test/CodeGen/Thumb2/thumb2-mvn2.ll
Modified:
    llvm/trunk/lib/Target/ARM/ARMInstrThumb2.td

Modified: llvm/trunk/lib/Target/ARM/ARMInstrThumb2.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMInstrThumb2.td?rev=74355&r1=74354&r2=74355&view=diff

==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMInstrThumb2.td (original)
+++ llvm/trunk/lib/Target/ARM/ARMInstrThumb2.td Fri Jun 26 18:13:13 2009
@@ -482,6 +482,8 @@
 def : Thumb2Pat<(or      GPR:$src, t2_so_imm_not:$imm),
                 (t2ORNri GPR:$src, t2_so_imm_not:$imm)>;
 
+// Prefer over of t2EORri ra, rb, -1 because mvn has 16-bit version
+let AddedComplexity = 1 in
 defm t2MVN  : T2I_un_irs  <"mvn", UnOpFrag<(not node:$Src)>, 1, 1>;
 
 def : Thumb2Pat<(t2_so_imm_not:$src),

Added: llvm/trunk/test/CodeGen/Thumb2/thumb2-mvn2.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Thumb2/thumb2-mvn2.ll?rev=74355&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/Thumb2/thumb2-mvn2.ll (added)
+++ llvm/trunk/test/CodeGen/Thumb2/thumb2-mvn2.ll Fri Jun 26 18:13:13 2009
@@ -0,0 +1,11 @@
+; RUN: llvm-as < %s | llc -march=thumb -mattr=+thumb2 | grep {mvn\\W*r\[0-9\]*,\\W*r\[0-9\]*} | count 2
+
+define i32 @f1(i32 %a) {
+    %tmp = xor i32 4294967295, %a
+    ret i32 %tmp
+}
+
+define i32 @f2(i32 %a) {
+    %tmp = xor i32 %a, 4294967295
+    ret i32 %tmp
+}