[ValueTracking] Add tests for implied cond with swapped operands; NFC

Author: goldsteinn

llvm/test/Transforms/InstCombine/icmp-select-implies-common-op.ll

@@ -0,0 +1,93 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -passes=instcombine < %s | FileCheck %s
+
+define i1 @sgt_3_impliesF_eq_2(i8 %x, i8 %y) {
+; CHECK-LABEL: @sgt_3_impliesF_eq_2(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], 3
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 2, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp sgt i8 %x, 3
+  %sel = select i1 %cmp, i8 2, i8 %y
+  %cmp2 = icmp eq i8 %sel, %x
+  ret i1 %cmp2
+}
+
+define i1 @sgt_3_impliesT_sgt_2(i8 %x, i8 %y) {
+; CHECK-LABEL: @sgt_3_impliesT_sgt_2(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], 3
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 2, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp sgt i8 %x, 3
+  %sel = select i1 %cmp, i8 2, i8 %y
+  %cmp2 = icmp sgt i8 %sel, %x
+  ret i1 %cmp2
+}
+
+define i1 @sgt_x_impliesF_eq_smin_todo(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @sgt_x_impliesF_eq_smin_todo(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], [[Z:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 -128, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp sgt i8 %x, %z
+  %sel = select i1 %cmp, i8 -128, i8 %y
+  %cmp2 = icmp eq i8 %sel, %x
+  ret i1 %cmp2
+}
+
+define i1 @slt_x_impliesT_ne_smin_todo(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @slt_x_impliesT_ne_smin_todo(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i8 [[X:%.*]], [[Z:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 127, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp slt i8 %x, %z
+  %sel = select i1 %cmp, i8 127, i8 %y
+  %cmp2 = icmp ne i8 %x, %sel
+  ret i1 %cmp2
+}
+
+define i1 @ult_x_impliesT_eq_umax_todo(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @ult_x_impliesT_eq_umax_todo(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i8 [[Z:%.*]], [[X:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 -1, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp ugt i8 %z, %x
+  %sel = select i1 %cmp, i8 255, i8 %y
+  %cmp2 = icmp ne i8 %sel, %x
+  ret i1 %cmp2
+}
+
+define i1 @ult_1_impliesF_eq_1(i8 %x, i8 %y) {
+; CHECK-LABEL: @ult_1_impliesF_eq_1(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[SEL:%.*]], 0
+; CHECK-NEXT:    [[X:%.*]] = select i1 [[CMP]], i8 1, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i8 [[X]], [[SEL]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp ult i8 %x, 1
+  %sel = select i1 %cmp, i8 1, i8 %y
+  %cmp2 = icmp eq i8 %x, %sel
+  ret i1 %cmp2
+}
+
+define i1 @ugt_x_impliesF_eq_umin_todo(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @ugt_x_impliesF_eq_umin_todo(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i8 [[Z:%.*]], [[X:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 0, i8 [[Y:%.*]]
+; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i8 [[SEL]], [[X]]
+; CHECK-NEXT:    ret i1 [[CMP2]]
+;
+  %cmp = icmp ugt i8 %z, %x
+  %sel = select i1 %cmp, i8 0, i8 %y
+  %cmp2 = icmp eq i8 %x, %sel
+  ret i1 %cmp2
+}