[InstCombine] add tests for checking power-of-2; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363938 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/ispow2.ll b/test/Transforms/InstCombine/ispow2.ll
new file mode 100644 (file)
index 0000000..8ecc185
--- /dev/null
+++ b/test/Transforms/InstCombine/ispow2.ll
@@ -0,0 +1,138 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i1 @is_pow2or0_negate_op(i32 %x) {
+; CHECK-LABEL: @is_pow2or0_negate_op(
+; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NEG]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[AND]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %neg = sub i32 0, %x
+  %and = and i32 %neg, %x
+  %cmp = icmp eq i32 %and, %x
+  ret i1 %cmp
+}
+
+define <2 x i1> @is_pow2or0_negate_op_vec(<2 x i32> %x) {
+; CHECK-LABEL: @is_pow2or0_negate_op_vec(
+; CHECK-NEXT:    [[NEG:%.*]] = sub <2 x i32> zeroinitializer, [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i32> [[NEG]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq <2 x i32> [[AND]], [[X]]
+; CHECK-NEXT:    ret <2 x i1> [[CMP]]
+;
+  %neg = sub <2 x i32> zeroinitializer, %x
+  %and = and <2 x i32> %neg, %x
+  %cmp = icmp eq <2 x i32> %and, %x
+  ret <2 x i1> %cmp
+}
+
+define i1 @is_pow2or0_decrement_op(i8 %x) {
+; CHECK-LABEL: @is_pow2or0_decrement_op(
+; CHECK-NEXT:    [[DEC:%.*]] = add i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DEC]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %dec = add i8 %x, -1
+  %and = and i8 %dec, %x
+  %cmp = icmp eq i8 %and, 0
+  ret i1 %cmp
+}
+
+define <2 x i1> @is_pow2or0_decrement_op_vec(<2 x i8> %x) {
+; CHECK-LABEL: @is_pow2or0_decrement_op_vec(
+; CHECK-NEXT:    [[DEC:%.*]] = add <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i8> [[DEC]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq <2 x i8> [[AND]], zeroinitializer
+; CHECK-NEXT:    ret <2 x i1> [[CMP]]
+;
+  %dec = add <2 x i8> %x, <i8 -1, i8 -1>
+  %and = and <2 x i8> %dec, %x
+  %cmp = icmp eq <2 x i8> %and, zeroinitializer
+  ret <2 x i1> %cmp
+}
+
+define i1 @isnot_pow2or0_negate_op(i32 %x) {
+; CHECK-LABEL: @isnot_pow2or0_negate_op(
+; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NEG]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[AND]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %neg = sub i32 0, %x
+  %and = and i32 %neg, %x
+  %cmp = icmp ne i32 %and, %x
+  ret i1 %cmp
+}
+
+define <2 x i1> @isnot_pow2or0_negate_op_vec(<2 x i32> %x) {
+; CHECK-LABEL: @isnot_pow2or0_negate_op_vec(
+; CHECK-NEXT:    [[NEG:%.*]] = sub <2 x i32> zeroinitializer, [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i32> [[NEG]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne <2 x i32> [[AND]], [[X]]
+; CHECK-NEXT:    ret <2 x i1> [[CMP]]
+;
+  %neg = sub <2 x i32> zeroinitializer, %x
+  %and = and <2 x i32> %neg, %x
+  %cmp = icmp ne <2 x i32> %and, %x
+  ret <2 x i1> %cmp
+}
+
+define i1 @isnot_pow2or0_decrement_op(i8 %x) {
+; CHECK-LABEL: @isnot_pow2or0_decrement_op(
+; CHECK-NEXT:    [[DEC:%.*]] = add i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DEC]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %dec = add i8 %x, -1
+  %and = and i8 %dec, %x
+  %cmp = icmp ne i8 %and, 0
+  ret i1 %cmp
+}
+
+define <2 x i1> @isnot_pow2or0_decrement_op_vec(<2 x i8> %x) {
+; CHECK-LABEL: @isnot_pow2or0_decrement_op_vec(
+; CHECK-NEXT:    [[DEC:%.*]] = add <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[AND:%.*]] = and <2 x i8> [[DEC]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne <2 x i8> [[AND]], zeroinitializer
+; CHECK-NEXT:    ret <2 x i1> [[CMP]]
+;
+  %dec = add <2 x i8> %x, <i8 -1, i8 -1>
+  %and = and <2 x i8> %dec, %x
+  %cmp = icmp ne <2 x i8> %and, zeroinitializer
+  ret <2 x i1> %cmp
+}
+
+declare void @use(i32)
+
+define i1 @is_pow2or0_negate_op_extra_use1(i32 %x) {
+; CHECK-LABEL: @is_pow2or0_negate_op_extra_use1(
+; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    call void @use(i32 [[NEG]])
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NEG]], [[X]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[AND]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %neg = sub i32 0, %x
+  call void @use(i32 %neg)
+  %and = and i32 %neg, %x
+  %cmp = icmp eq i32 %and, %x
+  ret i1 %cmp
+}
+
+define i1 @is_pow2or0_negate_op_extra_use2(i32 %x) {
+; CHECK-LABEL: @is_pow2or0_negate_op_extra_use2(
+; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[NEG]], [[X]]
+; CHECK-NEXT:    call void @use(i32 [[AND]])
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[AND]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %neg = sub i32 0, %x
+  %and = and i32 %neg, %x
+  call void @use(i32 %and)
+  %cmp = icmp eq i32 %and, %x
+  ret i1 %cmp
+}