When possible, use "mvn ra, rb" instead of "eor ra, rb, -1" because mvn has a narrow...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74355 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index c965d1d..c2dd3a8 100644 (file)
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -482,6 +482,8 @@ defm t2ORN  : T2I_bin_irs<"orn", BinOpFrag<(or  node:$LHS, (not node:$RHS))>>;
 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),

diff --git a/test/CodeGen/Thumb2/thumb2-mvn2.ll b/test/CodeGen/Thumb2/thumb2-mvn2.ll
new file mode 100644 (file)
index 0000000..178f02b
--- /dev/null
+++ b/test/CodeGen/Thumb2/thumb2-mvn2.ll
@@ -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
+}