From 9bba938de46fd2ef71a76891cea2fd0e0d183226 Mon Sep 17 00:00:00 2001
From: David Bolvansky <david.bolvansky@gmail.com>
Date: Tue, 2 Apr 2019 18:33:54 +0000
Subject: [PATCH] [InstCombine] Added tests for PR41273

llvm-svn: 357508
---
 .../InstCombine/ctlz-cttz-bitreverse.ll       | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 llvm/test/Transforms/InstCombine/ctlz-cttz-bitreverse.ll

diff --git a/llvm/test/Transforms/InstCombine/ctlz-cttz-bitreverse.ll b/llvm/test/Transforms/InstCombine/ctlz-cttz-bitreverse.ll
new file mode 100644
index 000000000000..2779f96e3a54
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/ctlz-cttz-bitreverse.ll
@@ -0,0 +1,75 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+define i32 @ctlz_true_bitreverse(i32 %x) {
+; CHECK-LABEL: @ctlz_true_bitreverse(
+; CHECK-NEXT:    [[A:%.*]] = tail call i32 @llvm.bitreverse.i32(i32 [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[A]], i1 true), !range !0
+; CHECK-NEXT:    ret i32 [[B]]
+;
+  %a = tail call i32 @llvm.bitreverse.i32(i32 %x)
+  %b = tail call i32 @llvm.ctlz.i32(i32 %a, i1 true)
+  ret i32 %b
+}
+
+define <2 x i64> @ctlz_true_bitreverse_vec(<2 x i64> %x) {
+; CHECK-LABEL: @ctlz_true_bitreverse_vec(
+; CHECK-NEXT:    [[A:%.*]] = tail call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call <2 x i64> @llvm.ctlz.v2i64(<2 x i64> [[A]], i1 true)
+; CHECK-NEXT:    ret <2 x i64> [[B]]
+;
+  %a = tail call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> %x)
+  %b = tail call <2 x i64> @llvm.ctlz.v2i64(<2 x i64> %a, i1 true)
+  ret <2 x i64> %b
+}
+
+define i32 @ctlz_false_bitreverse(i32 %x) {
+; CHECK-LABEL: @ctlz_false_bitreverse(
+; CHECK-NEXT:    [[A:%.*]] = tail call i32 @llvm.bitreverse.i32(i32 [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[A]], i1 false), !range !0
+; CHECK-NEXT:    ret i32 [[B]]
+;
+  %a = tail call i32 @llvm.bitreverse.i32(i32 %x)
+  %b = tail call i32 @llvm.ctlz.i32(i32 %a, i1 false)
+  ret i32 %b
+}
+
+define i32 @cttz_true_bitreverse(i32 %x) {
+; CHECK-LABEL: @cttz_true_bitreverse(
+; CHECK-NEXT:    [[A:%.*]] = tail call i32 @llvm.bitreverse.i32(i32 [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[A]], i1 true), !range !0
+; CHECK-NEXT:    ret i32 [[B]]
+;
+  %a = tail call i32 @llvm.bitreverse.i32(i32 %x)
+  %b = tail call i32 @llvm.cttz.i32(i32 %a, i1 true)
+  ret i32 %b
+}
+
+define <2 x i64> @cttz_true_bitreverse_vec(<2 x i64> %x) {
+; CHECK-LABEL: @cttz_true_bitreverse_vec(
+; CHECK-NEXT:    [[A:%.*]] = tail call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call <2 x i64> @llvm.cttz.v2i64(<2 x i64> [[A]], i1 true)
+; CHECK-NEXT:    ret <2 x i64> [[B]]
+;
+  %a = tail call <2 x i64> @llvm.bitreverse.v2i64(<2 x i64> %x)
+  %b = tail call <2 x i64> @llvm.cttz.v2i64(<2 x i64> %a, i1 true)
+  ret <2 x i64> %b
+}
+
+define i32 @cttz_false_bitreverse(i32 %x) {
+; CHECK-LABEL: @cttz_false_bitreverse(
+; CHECK-NEXT:    [[A:%.*]] = tail call i32 @llvm.bitreverse.i32(i32 [[X:%.*]])
+; CHECK-NEXT:    [[B:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[A]], i1 false), !range !0
+; CHECK-NEXT:    ret i32 [[B]]
+;
+  %a = tail call i32 @llvm.bitreverse.i32(i32 %x)
+  %b = tail call i32 @llvm.cttz.i32(i32 %a, i1 false)
+  ret i32 %b
+}
+
+declare i32 @llvm.bitreverse.i32(i32)
+declare <2 x i64> @llvm.bitreverse.v2i64(<2 x i64>)
+declare i32 @llvm.ctlz.i32(i32, i1)
+declare i32 @llvm.cttz.i32(i32, i1)
+declare <2 x i64> @llvm.ctlz.v2i64(<2 x i64>, i1)
+declare <2 x i64> @llvm.cttz.v2i64(<2 x i64>, i1)