[llvm] r305438 - [InstCombine] Add a test case to show a case where don't handle a partially commuted IR. NFC

[Craig Topper via llvm-commits]

Author: ctopper
Date: Wed Jun 14 20:01:01 2017
New Revision: 305438

URL: http://llvm.org/viewvc/llvm-project?rev=305438&view=rev
Log:
[InstCombine] Add a test case to show a case where don't handle a partially commuted IR. NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/onehot_merge.ll

Modified: llvm/trunk/test/Transforms/InstCombine/onehot_merge.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/onehot_merge.ll?rev=305438&r1=305437&r2=305438&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/onehot_merge.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/onehot_merge.ll Wed Jun 14 20:01:01 2017
@@ -33,3 +33,30 @@ bb:
   ret i1 %or
 }
 
+; Same as above but with operands commuted one of the ands, but not the other.
+; TODO handle this form correctly
+define i1 @foo1_and_commuted(i32 %k, i32 %c1, i32 %c2) {
+; CHECK-LABEL: @foo1_and_commuted(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[K2:%.*]] = mul i32 [[K:%.*]], [[K]]
+; CHECK-NEXT:    [[TMP:%.*]] = shl i32 1, [[C1:%.*]]
+; CHECK-NEXT:    [[TMP4:%.*]] = lshr i32 -2147483648, [[C2:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[K2]], [[TMP]]
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 0
+; CHECK-NEXT:    [[TMP5:%.*]] = and i32 [[TMP4]], [[K2]]
+; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i32 [[TMP5]], 0
+; CHECK-NEXT:    [[OR:%.*]] = or i1 [[TMP2]], [[TMP6]]
+; CHECK-NEXT:    ret i1 [[OR]]
+;
+bb:
+  %k2 = mul i32 %k, %k ; to trick the complexity sorting
+  %tmp = shl i32 1, %c1
+  %tmp4 = lshr i32 -2147483648, %c2
+  %tmp1 = and i32 %k2, %tmp
+  %tmp2 = icmp eq i32 %tmp1, 0
+  %tmp5 = and i32 %tmp4, %k2
+  %tmp6 = icmp eq i32 %tmp5, 0
+  %or = or i1 %tmp2, %tmp6
+  ret i1 %or
+}
+