[PATCH] D142299: [InstSimplify] Add tests for `icmp eq/ne/ugt/ult X, 0` where `X` is known to be zero; NFC
Noah Goldstein via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Jan 21 21:56:14 PST 2023
goldstein.w.n created this revision.
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goldstein.w.n requested review of this revision.
Herald added a project: LLVM.
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Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D142299
Files:
llvm/test/Transforms/InstSimplify/icmp-constant.ll
Index: llvm/test/Transforms/InstSimplify/icmp-constant.ll
===================================================================
--- llvm/test/Transforms/InstSimplify/icmp-constant.ll
+++ llvm/test/Transforms/InstSimplify/icmp-constant.ll
@@ -1140,3 +1140,64 @@
%c = icmp ult <2 x i8> %x, <i8 undef, i8 poison>
ret <2 x i1> %c
}
+
+
+define i1 @cmp_ne_0_is_false(i32 %x) {
+; CHECK-LABEL: @cmp_ne_0_is_false(
+; CHECK-NEXT: [[Y:%.*]] = add i32 [[X:%.*]], 1
+; CHECK-NEXT: [[Z:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT: [[B:%.*]] = and i32 [[Z]], 1
+; CHECK-NEXT: [[E:%.*]] = icmp ne i32 [[B]], 0
+; CHECK-NEXT: ret i1 [[E]]
+;
+ %y = add i32 %x, 1
+ %z = and i32 %x, %y
+ %b = and i32 %z, 1
+ %e = icmp ne i32 %b, 0
+ ret i1 %e
+}
+
+define i1 @cmp_eq_0_is_true(i32 %x) {
+; CHECK-LABEL: @cmp_eq_0_is_true(
+; CHECK-NEXT: [[Y:%.*]] = add i32 [[X:%.*]], 1
+; CHECK-NEXT: [[Z:%.*]] = and i32 [[X]], [[Y]]
+; CHECK-NEXT: [[B:%.*]] = and i32 [[Z]], 1
+; CHECK-NEXT: [[E:%.*]] = icmp eq i32 [[B]], 0
+; CHECK-NEXT: ret i1 [[E]]
+;
+ %y = add i32 %x, 1
+ %z = and i32 %x, %y
+ %b = and i32 %z, 1
+ %e = icmp eq i32 %b, 0
+ ret i1 %e
+}
+
+define <2 x i1> @cmp_ule_0_is_true(<2 x i32> %x) {
+; CHECK-LABEL: @cmp_ule_0_is_true(
+; CHECK-NEXT: [[Y:%.*]] = add <2 x i32> [[X:%.*]], <i32 1, i32 1>
+; CHECK-NEXT: [[Z:%.*]] = and <2 x i32> [[X]], [[Y]]
+; CHECK-NEXT: [[B:%.*]] = and <2 x i32> [[Z]], <i32 1, i32 1>
+; CHECK-NEXT: [[E:%.*]] = icmp ule <2 x i32> [[B]], zeroinitializer
+; CHECK-NEXT: ret <2 x i1> [[E]]
+;
+ %y = add <2 x i32> %x, <i32 1, i32 1>
+ %z = and <2 x i32> %x, %y
+ %b = and <2 x i32> %z, <i32 1, i32 1>
+ %e = icmp ule <2 x i32> %b, <i32 0, i32 0>
+ ret <2 x i1> %e
+}
+
+define <2 x i1> @cmp_ugt_0_is_false(<2 x i32> %x) {
+; CHECK-LABEL: @cmp_ugt_0_is_false(
+; CHECK-NEXT: [[Y:%.*]] = add <2 x i32> [[X:%.*]], <i32 1, i32 1>
+; CHECK-NEXT: [[Z:%.*]] = and <2 x i32> [[X]], [[Y]]
+; CHECK-NEXT: [[B:%.*]] = and <2 x i32> [[Z]], <i32 1, i32 1>
+; CHECK-NEXT: [[E:%.*]] = icmp ugt <2 x i32> [[B]], zeroinitializer
+; CHECK-NEXT: ret <2 x i1> [[E]]
+;
+ %y = add <2 x i32> %x, <i32 1, i32 1>
+ %z = and <2 x i32> %x, %y
+ %b = and <2 x i32> %z, <i32 1, i32 1>
+ %e = icmp ugt <2 x i32> %b, <i32 0, i32 0>
+ ret <2 x i1> %e
+}
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