[SimplifyCFG] Add test with multiple eq cond in if chain (NFC)

Author: andjo403

llvm/test/Transforms/SimplifyCFG/switch_create.ll

@@ -1125,3 +1125,68 @@ F:
   ret void
 }
 
+define void @extra_cond_is_eq_cmp(i8 %c, i32 %x)  {
+; CHECK-LABEL: @extra_cond_is_eq_cmp(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[X:%.*]], 32
+; CHECK-NEXT:    [[CMP4:%.*]] = icmp eq i8 [[C:%.*]], 97
+; CHECK-NEXT:    [[OR_COND:%.*]] = or i1 [[CMP]], [[CMP4]]
+; CHECK-NEXT:    [[CMP9:%.*]] = icmp eq i8 [[C]], 99
+; CHECK-NEXT:    [[TMP0:%.*]] = or i1 [[OR_COND]], [[CMP9]]
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[SWITCH_EARLY_TEST:%.*]]
+; CHECK:       common.ret:
+; CHECK-NEXT:    ret void
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @foo1()
+; CHECK-NEXT:    br label [[SWITCH_EARLY_TEST]]
+;
+entry:
+  %cmp = icmp eq i32 %x, 32
+  %cmp4 = icmp eq i8 %c, 97
+  %or.cond = or i1 %cmp, %cmp4
+  %cmp9 = icmp eq i8 %c, 99
+  %or.cond11 = or i1 %or.cond, %cmp9
+  br i1 %or.cond11, label %if.then, label %if.end
+
+if.then:
+  tail call void @foo1()
+  ret void
+
+if.end:
+  ret void
+
+}
+
+define void @extra_cond_is_eq_cmp_c(i8 %c, i32 %x)  {
+; CHECK-LABEL: @extra_cond_is_eq_cmp_c(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[X:%.*]], 32
+; CHECK-NEXT:    [[TMP0:%.*]] = freeze i1 [[CMP]]
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[SWITCH_EARLY_TEST:%.*]]
+; CHECK:       switch.early.test:
+; CHECK-NEXT:    switch i8 [[C:%.*]], label [[COMMON_RET:%.*]] [
+; CHECK-NEXT:      i8 99, label [[IF_THEN]]
+; CHECK-NEXT:      i8 97, label [[IF_THEN]]
+; CHECK-NEXT:    ]
+; CHECK:       common.ret:
+; CHECK-NEXT:    ret void
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @foo1()
+; CHECK-NEXT:    br label [[COMMON_RET]]
+;
+entry:
+  %cmp = icmp eq i32 %x, 32
+  %cmp4 = icmp eq i8 %c, 97
+  %or.cond = or i1 %cmp4, %cmp
+  %cmp9 = icmp eq i8 %c, 99
+  %or.cond11 = or i1 %or.cond, %cmp9
+  br i1 %or.cond11, label %if.then, label %if.end
+
+if.then:
+  tail call void @foo1()
+  ret void
+
+if.end:
+  ret void
+
+}