[llvm] ece1403 - [InstSimplify] Add additional select operand replacement tests (NFC)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2021-03-21T15:30:30+01:00
New Revision: ece1403acadadf0b101bc68a8c69c613ca4f816f

URL: https://github.com/llvm/llvm-project/commit/ece1403acadadf0b101bc68a8c69c613ca4f816f
DIFF: https://github.com/llvm/llvm-project/commit/ece1403acadadf0b101bc68a8c69c613ca4f816f.diff

LOG: [InstSimplify] Add additional select operand replacement tests (NFC)

This tests for binops with identity elements.

Added: 
    

Modified: 
    llvm/test/Transforms/InstSimplify/select.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstSimplify/select.ll b/llvm/test/Transforms/InstSimplify/select.ll
index 6460b42d63c1..86d76725e131 100644
--- a/llvm/test/Transforms/InstSimplify/select.ll
+++ b/llvm/test/Transforms/InstSimplify/select.ll
@@ -969,6 +969,52 @@ define <vscale x 2 x i1> @ignore_scalable_undef(<vscale x 2 x i1> %cond) {
   ret <vscale x 2 x i1> %s
 }
 
+define i32 @select_neutral_add_rhs(i32 %x, i32 %y) {
+; CHECK-LABEL: @select_neutral_add_rhs(
+; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    ret i32 [[ADD]]
+;
+  %cmp = icmp ne i32 %y, 0
+  %add = add i32 %x, %y
+  %sel = select i1 %cmp, i32 %add, i32 %x
+  ret i32 %sel
+}
+
+define i32 @select_neutral_add_lhs(i32 %x, i32 %y) {
+; CHECK-LABEL: @select_neutral_add_lhs(
+; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[Y:%.*]], [[X:%.*]]
+; CHECK-NEXT:    ret i32 [[ADD]]
+;
+  %cmp = icmp ne i32 %y, 0
+  %add = add i32 %y, %x
+  %sel = select i1 %cmp, i32 %add, i32 %x
+  ret i32 %sel
+}
+
+define i32 @select_neutral_sub_rhs(i32 %x, i32 %y) {
+; CHECK-LABEL: @select_neutral_sub_rhs(
+; CHECK-NEXT:    [[ADD:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    ret i32 [[ADD]]
+;
+  %cmp = icmp ne i32 %y, 0
+  %add = sub i32 %x, %y
+  %sel = select i1 %cmp, i32 %add, i32 %x
+  ret i32 %sel
+}
+
+define i32 @select_neutral_sub_lhs(i32 %x, i32 %y) {
+; CHECK-LABEL: @select_neutral_sub_lhs(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[Y:%.*]], 0
+; CHECK-NEXT:    [[ADD:%.*]] = sub i32 [[Y]], [[X:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i32 [[ADD]], i32 [[X]]
+; CHECK-NEXT:    ret i32 [[SEL]]
+;
+  %cmp = icmp ne i32 %y, 0
+  %add = sub i32 %y, %x
+  %sel = select i1 %cmp, i32 %add, i32 %x
+  ret i32 %sel
+}
+
 ; TODO: these can be optimized more
 
 define i32 @poison(i32 %x, i32 %y) {