[SLP][NFC]Add a test with the wrong result extension after reduction,

NFC.

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/RISCV/reduction-extension-after-bitwidth.ll

@@ -0,0 +1,33 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S -mtriple=riscv64-unknown-linux-gnu -mattr="+v" --passes=slp-vectorizer < %s | FileCheck %s
+
+define i32 @test(ptr %0, ptr %1) {
+; CHECK-LABEL: define i32 @test(
+; CHECK-SAME: ptr [[TMP0:%.*]], ptr [[TMP1:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[LOAD_5:%.*]] = load i32, ptr [[TMP1]], align 4
+; CHECK-NEXT:    [[TMP2:%.*]] = call i1 @llvm.vector.reduce.and.v4i1(<4 x i1> <i1 true, i1 true, i1 true, i1 true>)
+; CHECK-NEXT:    [[TMP3:%.*]] = sext i1 [[TMP2]] to i32
+; CHECK-NEXT:    [[OP_RDX:%.*]] = and i32 [[TMP3]], [[LOAD_5]]
+; CHECK-NEXT:    ret i32 [[OP_RDX]]
+;
+entry:
+  %zext.0 = zext i8 1 to i32
+  %zext.1 = zext i8 1 to i32
+  %zext.2 = zext i8 1 to i32
+  %zext.3 = zext i8 1 to i32
+  %select.zext.0 = select i1 false, i32 -1, i32 %zext.0
+  %select.zext.1 = select i1 false, i32 0, i32 %zext.1
+  %select.zext.2 = select i1 false, i32 0, i32 %zext.2
+  %select.zext.3 = select i1 false, i32 0, i32 %zext.3
+
+  %load.5 = load i32, ptr %1, align 4
+
+  %and.0 = and i32 %load.5, %select.zext.0
+  %and.1 = and i32 %and.0, %select.zext.1
+  %and.2 = and i32 %and.1, %select.zext.2
+  %and.3 = and i32 %and.2, %select.zext.3
+
+  ret i32 %and.3
+}
+