From 60809ff74b154bc998d647b58bb8d176d2e3f5da Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Mon, 15 May 2017 22:54:37 +0000
Subject: [PATCH] [InstSimplify] add tests for unnecessary mask of shifted
 values; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303127 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstSimplify/AndOrXor.ll | 67 ++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/test/Transforms/InstSimplify/AndOrXor.ll b/test/Transforms/InstSimplify/AndOrXor.ll
index 9aa96eb2bdb..427ea655fcb 100644
--- a/test/Transforms/InstSimplify/AndOrXor.ll
+++ b/test/Transforms/InstSimplify/AndOrXor.ll
@@ -734,3 +734,70 @@ define i32 @test54(i32 %a, i32 %b) {
   %or = or i32 %and, %xor
   ret i32 %or
 }
+
+define i8 @lshr_perfect_mask(i8 %x) {
+; CHECK-LABEL: @lshr_perfect_mask(
+; CHECK-NEXT:    [[SH:%.*]] = lshr i8 %x, 5
+; CHECK-NEXT:    [[MASK:%.*]] = and i8 [[SH]], 7
+; CHECK-NEXT:    ret i8 [[MASK]]
+;
+  %sh = lshr i8 %x, 5
+  %mask = and i8 %sh, 7  ; 0x07
+  ret i8 %mask
+}
+
+define <2 x i8> @lshr_oversized_mask_splat(<2 x i8> %x) {
+; CHECK-LABEL: @lshr_oversized_mask_splat(
+; CHECK-NEXT:    [[SH:%.*]] = lshr <2 x i8> %x, <i8 5, i8 5>
+; CHECK-NEXT:    [[MASK:%.*]] = and <2 x i8> [[SH]], <i8 -121, i8 -121>
+; CHECK-NEXT:    ret <2 x i8> [[MASK]]
+;
+  %sh = lshr <2 x i8> %x, <i8 5, i8 5>
+  %mask = and <2 x i8> %sh, <i8 135, i8 135>  ; 0x87
+  ret <2 x i8> %mask
+}
+
+define i8 @lshr_undersized_mask(i8 %x) {
+; CHECK-LABEL: @lshr_undersized_mask(
+; CHECK-NEXT:    [[SH:%.*]] = lshr i8 %x, 5
+; CHECK-NEXT:    [[MASK:%.*]] = and i8 [[SH]], -2
+; CHECK-NEXT:    ret i8 [[MASK]]
+;
+  %sh = lshr i8 %x, 5
+  %mask = and i8 %sh, -2  ; 0xFE
+  ret i8 %mask
+}
+
+define <2 x i8> @shl_perfect_mask_splat(<2 x i8> %x) {
+; CHECK-LABEL: @shl_perfect_mask_splat(
+; CHECK-NEXT:    [[SH:%.*]] = shl <2 x i8> %x, <i8 6, i8 6>
+; CHECK-NEXT:    [[MASK:%.*]] = and <2 x i8> [[SH]], <i8 -64, i8 -64>
+; CHECK-NEXT:    ret <2 x i8> [[MASK]]
+;
+  %sh = shl <2 x i8> %x, <i8 6, i8 6>
+  %mask = and <2 x i8> %sh, <i8 192, i8 192>  ; 0xC0
+  ret <2 x i8> %mask
+}
+
+define i8 @shl_oversized_mask(i8 %x) {
+; CHECK-LABEL: @shl_oversized_mask(
+; CHECK-NEXT:    [[SH:%.*]] = shl i8 %x, 6
+; CHECK-NEXT:    [[MASK:%.*]] = and i8 [[SH]], -61
+; CHECK-NEXT:    ret i8 [[MASK]]
+;
+  %sh = shl i8 %x, 6
+  %mask = and i8 %sh, 195  ; 0xC3
+  ret i8 %mask
+}
+
+define <2 x i8> @shl_undersized_mask_splat(<2 x i8> %x) {
+; CHECK-LABEL: @shl_undersized_mask_splat(
+; CHECK-NEXT:    [[SH:%.*]] = shl <2 x i8> [[X:%.*]], <i8 6, i8 6>
+; CHECK-NEXT:    [[MASK:%.*]] = and <2 x i8> [[SH]], <i8 -120, i8 -120>
+; CHECK-NEXT:    ret <2 x i8> [[MASK]]
+;
+  %sh = shl <2 x i8> %x, <i8 6, i8 6>
+  %mask = and <2 x i8> %sh, <i8 136, i8 136>  ; 0x88
+  ret <2 x i8> %mask
+}
+
-- 
2.50.1