From: Sanjay Patel <spatel@rotateright.com>
Date: Sat, 6 Jun 2020 14:53:45 +0000 (-0400)
Subject: [InstCombine] add tests for bitmask of casted shift; NFC (PR46013)
X-Git-Tag: llvmorg-12-init~3841
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c6719d0b47086b7c8560b8641ab574ec8e208000;p=platform%2Fupstream%2Fllvm.git

[InstCombine] add tests for bitmask of casted shift; NFC (PR46013)
---

diff --git a/llvm/test/Transforms/InstCombine/and.ll b/llvm/test/Transforms/InstCombine/and.ll
index 025f057..408c3c9 100644
--- a/llvm/test/Transforms/InstCombine/and.ll
+++ b/llvm/test/Transforms/InstCombine/and.ll
@@ -1,6 +1,9 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 
+declare void @use8(i8)
+declare void @use32(i32)
+
 ; There should be no 'and' instructions left in any test.
 
 define i32 @test1(i32 %A) {
@@ -13,7 +16,7 @@ define i32 @test1(i32 %A) {
 
 define i32 @test2(i32 %A) {
 ; CHECK-LABEL: @test2(
-; CHECK-NEXT:    ret i32 %A
+; CHECK-NEXT:    ret i32 [[A:%.*]]
 ;
   %B = and i32 %A, -1
   ret i32 %B
@@ -29,7 +32,7 @@ define i1 @test3(i1 %A) {
 
 define i1 @test4(i1 %A) {
 ; CHECK-LABEL: @test4(
-; CHECK-NEXT:    ret i1 %A
+; CHECK-NEXT:    ret i1 [[A:%.*]]
 ;
   %B = and i1 %A, true
   ret i1 %B
@@ -37,7 +40,7 @@ define i1 @test4(i1 %A) {
 
 define i32 @test5(i32 %A) {
 ; CHECK-LABEL: @test5(
-; CHECK-NEXT:    ret i32 %A
+; CHECK-NEXT:    ret i32 [[A:%.*]]
 ;
   %B = and i32 %A, %A
   ret i32 %B
@@ -45,7 +48,7 @@ define i32 @test5(i32 %A) {
 
 define i1 @test6(i1 %A) {
 ; CHECK-LABEL: @test6(
-; CHECK-NEXT:    ret i1 %A
+; CHECK-NEXT:    ret i1 [[A:%.*]]
 ;
   %B = and i1 %A, %A
   ret i1 %B
@@ -74,7 +77,7 @@ define i8 @test8(i8 %A) {
 ; Test of sign bit, convert to setle %A, 0
 define i1 @test9(i32 %A) {
 ; CHECK-LABEL: @test9(
-; CHECK-NEXT:    [[C:%.*]] = icmp slt i32 %A, 0
+; CHECK-NEXT:    [[C:%.*]] = icmp slt i32 [[A:%.*]], 0
 ; CHECK-NEXT:    ret i1 [[C]]
 ;
   %B = and i32 %A, -2147483648
@@ -85,7 +88,7 @@ define i1 @test9(i32 %A) {
 ; Test of sign bit, convert to setle %A, 0
 define i1 @test9a(i32 %A) {
 ; CHECK-LABEL: @test9a(
-; CHECK-NEXT:    [[C:%.*]] = icmp slt i32 %A, 0
+; CHECK-NEXT:    [[C:%.*]] = icmp slt i32 [[A:%.*]], 0
 ; CHECK-NEXT:    ret i1 [[C]]
 ;
   %B = and i32 %A, -2147483648
@@ -106,9 +109,9 @@ define i32 @test10(i32 %A) {
 
 define i32 @test11(i32 %A, i32* %P) {
 ; CHECK-LABEL: @test11(
-; CHECK-NEXT:    [[B:%.*]] = or i32 %A, 3
+; CHECK-NEXT:    [[B:%.*]] = or i32 [[A:%.*]], 3
 ; CHECK-NEXT:    [[C:%.*]] = xor i32 [[B]], 12
-; CHECK-NEXT:    store i32 [[C]], i32* %P, align 4
+; CHECK-NEXT:    store i32 [[C]], i32* [[P:%.*]], align 4
 ; CHECK-NEXT:    ret i32 3
 ;
   %B = or i32 %A, 3
@@ -122,8 +125,8 @@ define i32 @test11(i32 %A, i32* %P) {
 
 define i1 @test12(i32 %A, i32 %B) {
 ; CHECK-LABEL: @test12(
-; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i32 %A, %B
-; CHECK-NEXT:    ret i1 [[TMP1]]
+; CHECK-NEXT:    [[C1:%.*]] = icmp ult i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    ret i1 [[C1]]
 ;
   %C1 = icmp ult i32 %A, %B
   %C2 = icmp ule i32 %A, %B
@@ -145,7 +148,7 @@ define i1 @test13(i32 %A, i32 %B) {
 
 define i1 @test14(i8 %A) {
 ; CHECK-LABEL: @test14(
-; CHECK-NEXT:    [[C:%.*]] = icmp slt i8 %A, 0
+; CHECK-NEXT:    [[C:%.*]] = icmp slt i8 [[A:%.*]], 0
 ; CHECK-NEXT:    ret i1 [[C]]
 ;
   %B = and i8 %A, -128
@@ -174,7 +177,7 @@ define i8 @test16(i8 %A) {
 
 define i1 @test18(i32 %A) {
 ; CHECK-LABEL: @test18(
-; CHECK-NEXT:    [[C:%.*]] = icmp ugt i32 %A, 127
+; CHECK-NEXT:    [[C:%.*]] = icmp ugt i32 [[A:%.*]], 127
 ; CHECK-NEXT:    ret i1 [[C]]
 ;
   %B = and i32 %A, -128
@@ -185,7 +188,7 @@ define i1 @test18(i32 %A) {
 
 define <2 x i1> @test18_vec(<2 x i32> %A) {
 ; CHECK-LABEL: @test18_vec(
-; CHECK-NEXT:    [[C:%.*]] = icmp ugt <2 x i32> %A, <i32 127, i32 127>
+; CHECK-NEXT:    [[C:%.*]] = icmp ugt <2 x i32> [[A:%.*]], <i32 127, i32 127>
 ; CHECK-NEXT:    ret <2 x i1> [[C]]
 ;
   %B = and <2 x i32> %A, <i32 -128, i32 -128>
@@ -195,7 +198,7 @@ define <2 x i1> @test18_vec(<2 x i32> %A) {
 
 define i1 @test18a(i8 %A) {
 ; CHECK-LABEL: @test18a(
-; CHECK-NEXT:    [[C:%.*]] = icmp ult i8 %A, 2
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i8 [[A:%.*]], 2
 ; CHECK-NEXT:    ret i1 [[C]]
 ;
   %B = and i8 %A, -2
@@ -205,7 +208,7 @@ define i1 @test18a(i8 %A) {
 
 define <2 x i1> @test18a_vec(<2 x i8> %A) {
 ; CHECK-LABEL: @test18a_vec(
-; CHECK-NEXT:    [[C:%.*]] = icmp ult <2 x i8> %A, <i8 2, i8 2>
+; CHECK-NEXT:    [[C:%.*]] = icmp ult <2 x i8> [[A:%.*]], <i8 2, i8 2>
 ; CHECK-NEXT:    ret <2 x i1> [[C]]
 ;
   %B = and <2 x i8> %A, <i8 -2, i8 -2>
@@ -215,7 +218,7 @@ define <2 x i1> @test18a_vec(<2 x i8> %A) {
 
 define i32 @test19(i32 %A) {
 ; CHECK-LABEL: @test19(
-; CHECK-NEXT:    [[B:%.*]] = shl i32 %A, 3
+; CHECK-NEXT:    [[B:%.*]] = shl i32 [[A:%.*]], 3
 ; CHECK-NEXT:    ret i32 [[B]]
 ;
   %B = shl i32 %A, 3
@@ -226,7 +229,7 @@ define i32 @test19(i32 %A) {
 
 define i8 @test20(i8 %A) {
 ; CHECK-LABEL: @test20(
-; CHECK-NEXT:    [[C:%.*]] = lshr i8 %A, 7
+; CHECK-NEXT:    [[C:%.*]] = lshr i8 [[A:%.*]], 7
 ; CHECK-NEXT:    ret i8 [[C]]
 ;
   %C = lshr i8 %A, 7
@@ -237,7 +240,7 @@ define i8 @test20(i8 %A) {
 
 define i1 @test23(i32 %A) {
 ; CHECK-LABEL: @test23(
-; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i32 %A, 2
+; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i32 [[A:%.*]], 2
 ; CHECK-NEXT:    ret i1 [[TMP1]]
 ;
   %B = icmp sgt i32 %A, 1
@@ -249,8 +252,8 @@ define i1 @test23(i32 %A) {
 ; FIXME: Vectors should fold too.
 define <2 x i1> @test23vec(<2 x i32> %A) {
 ; CHECK-LABEL: @test23vec(
-; CHECK-NEXT:    [[B:%.*]] = icmp sgt <2 x i32> %A, <i32 1, i32 1>
-; CHECK-NEXT:    [[C:%.*]] = icmp slt <2 x i32> %A, <i32 3, i32 3>
+; CHECK-NEXT:    [[B:%.*]] = icmp sgt <2 x i32> [[A:%.*]], <i32 1, i32 1>
+; CHECK-NEXT:    [[C:%.*]] = icmp slt <2 x i32> [[A]], <i32 3, i32 3>
 ; CHECK-NEXT:    [[D:%.*]] = and <2 x i1> [[B]], [[C]]
 ; CHECK-NEXT:    ret <2 x i1> [[D]]
 ;
@@ -262,7 +265,7 @@ define <2 x i1> @test23vec(<2 x i32> %A) {
 
 define i1 @test24(i32 %A) {
 ; CHECK-LABEL: @test24(
-; CHECK-NEXT:    [[TMP1:%.*]] = icmp sgt i32 %A, 2
+; CHECK-NEXT:    [[TMP1:%.*]] = icmp sgt i32 [[A:%.*]], 2
 ; CHECK-NEXT:    ret i1 [[TMP1]]
 ;
   %B = icmp sgt i32 %A, 1
@@ -274,7 +277,7 @@ define i1 @test24(i32 %A) {
 
 define i1 @test25(i32 %A) {
 ; CHECK-LABEL: @test25(
-; CHECK-NEXT:    [[A_OFF:%.*]] = add i32 %A, -50
+; CHECK-NEXT:    [[A_OFF:%.*]] = add i32 [[A:%.*]], -50
 ; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i32 [[A_OFF]], 50
 ; CHECK-NEXT:    ret i1 [[TMP1]]
 ;
@@ -287,8 +290,8 @@ define i1 @test25(i32 %A) {
 ; FIXME: Vectors should fold too.
 define <2 x i1> @test25vec(<2 x i32> %A) {
 ; CHECK-LABEL: @test25vec(
-; CHECK-NEXT:    [[B:%.*]] = icmp sgt <2 x i32> %A, <i32 49, i32 49>
-; CHECK-NEXT:    [[C:%.*]] = icmp slt <2 x i32> %A, <i32 100, i32 100>
+; CHECK-NEXT:    [[B:%.*]] = icmp sgt <2 x i32> [[A:%.*]], <i32 49, i32 49>
+; CHECK-NEXT:    [[C:%.*]] = icmp slt <2 x i32> [[A]], <i32 100, i32 100>
 ; CHECK-NEXT:    [[D:%.*]] = and <2 x i1> [[B]], [[C]]
 ; CHECK-NEXT:    ret <2 x i1> [[D]]
 ;
@@ -313,8 +316,8 @@ define i8 @test27(i8 %A) {
 ;; This is just a zero-extending shr.
 define i32 @test28(i32 %X) {
 ; CHECK-LABEL: @test28(
-; CHECK-NEXT:    [[Y1:%.*]] = lshr i32 %X, 24
-; CHECK-NEXT:    ret i32 [[Y1]]
+; CHECK-NEXT:    [[TMP1:%.*]] = lshr i32 [[X:%.*]], 24
+; CHECK-NEXT:    ret i32 [[TMP1]]
 ;
   ;; Sign extend
   %Y = ashr i32 %X, 24
@@ -325,7 +328,7 @@ define i32 @test28(i32 %X) {
 
 define i32 @test29(i8 %X) {
 ; CHECK-LABEL: @test29(
-; CHECK-NEXT:    [[Y:%.*]] = zext i8 %X to i32
+; CHECK-NEXT:    [[Y:%.*]] = zext i8 [[X:%.*]] to i32
 ; CHECK-NEXT:    ret i32 [[Y]]
 ;
   %Y = zext i8 %X to i32
@@ -336,7 +339,7 @@ define i32 @test29(i8 %X) {
 
 define i32 @test30(i1 %X) {
 ; CHECK-LABEL: @test30(
-; CHECK-NEXT:    [[Y:%.*]] = zext i1 %X to i32
+; CHECK-NEXT:    [[Y:%.*]] = zext i1 [[X:%.*]] to i32
 ; CHECK-NEXT:    ret i32 [[Y]]
 ;
   %Y = zext i1 %X to i32
@@ -359,7 +362,7 @@ define i32 @test31(i1 %X) {
 
 define <2 x i32> @and_demanded_bits_splat_vec(<2 x i32> %x) {
 ; CHECK-LABEL: @and_demanded_bits_splat_vec(
-; CHECK-NEXT:    [[Z:%.*]] = and <2 x i32> %x, <i32 7, i32 7>
+; CHECK-NEXT:    [[Z:%.*]] = and <2 x i32> [[X:%.*]], <i32 7, i32 7>
 ; CHECK-NEXT:    ret <2 x i32> [[Z]]
 ;
   %y = add <2 x i32> %x, <i32 8, i32 8>
@@ -373,7 +376,7 @@ define <2 x i32> @and_demanded_bits_splat_vec(<2 x i32> %x) {
 
 define i32 @and_zext_demanded(i16 %x, i32 %y) {
 ; CHECK-LABEL: @and_zext_demanded(
-; CHECK-NEXT:    [[S:%.*]] = lshr i16 %x, 8
+; CHECK-NEXT:    [[S:%.*]] = lshr i16 [[X:%.*]], 8
 ; CHECK-NEXT:    [[Z:%.*]] = zext i16 [[S]] to i32
 ; CHECK-NEXT:    ret i32 [[Z]]
 ;
@@ -397,59 +400,59 @@ define i32 @test32(i32 %In) {
 ;; Code corresponding to one-bit bitfield ^1.
 define i32 @test33(i32 %b) {
 ; CHECK-LABEL: @test33(
-; CHECK-NEXT:    [[TMP_13:%.*]] = xor i32 %b, 1
-; CHECK-NEXT:    ret i32 [[TMP_13]]
+; CHECK-NEXT:    [[T13:%.*]] = xor i32 [[B:%.*]], 1
+; CHECK-NEXT:    ret i32 [[T13]]
 ;
-  %tmp.4.mask = and i32 %b, 1
-  %tmp.10 = xor i32 %tmp.4.mask, 1
-  %tmp.12 = and i32 %b, -2
-  %tmp.13 = or i32 %tmp.12, %tmp.10
-  ret i32 %tmp.13
+  %t4.mask = and i32 %b, 1
+  %t10 = xor i32 %t4.mask, 1
+  %t12 = and i32 %b, -2
+  %t13 = or i32 %t12, %t10
+  ret i32 %t13
 }
 
 define i32 @test33b(i32 %b) {
 ; CHECK-LABEL: @test33b(
-; CHECK-NEXT:    [[TMP_13:%.*]] = xor i32 [[B:%.*]], 1
-; CHECK-NEXT:    ret i32 [[TMP_13]]
+; CHECK-NEXT:    [[T13:%.*]] = xor i32 [[B:%.*]], 1
+; CHECK-NEXT:    ret i32 [[T13]]
 ;
-  %tmp.4.mask = and i32 %b, 1
-  %tmp.10 = xor i32 %tmp.4.mask, 1
-  %tmp.12 = and i32 %b, -2
-  %tmp.13 = or i32 %tmp.10, %tmp.12
-  ret i32 %tmp.13
+  %t4.mask = and i32 %b, 1
+  %t10 = xor i32 %t4.mask, 1
+  %t12 = and i32 %b, -2
+  %t13 = or i32 %t10, %t12
+  ret i32 %t13
 }
 
 define <2 x i32> @test33vec(<2 x i32> %b) {
 ; CHECK-LABEL: @test33vec(
-; CHECK-NEXT:    [[TMP_13:%.*]] = xor <2 x i32> [[B:%.*]], <i32 1, i32 1>
-; CHECK-NEXT:    ret <2 x i32> [[TMP_13]]
+; CHECK-NEXT:    [[T13:%.*]] = xor <2 x i32> [[B:%.*]], <i32 1, i32 1>
+; CHECK-NEXT:    ret <2 x i32> [[T13]]
 ;
-  %tmp.4.mask = and <2 x i32> %b, <i32 1, i32 1>
-  %tmp.10 = xor <2 x i32> %tmp.4.mask, <i32 1, i32 1>
-  %tmp.12 = and <2 x i32> %b, <i32 -2, i32 -2>
-  %tmp.13 = or <2 x i32> %tmp.12, %tmp.10
-  ret <2 x i32> %tmp.13
+  %t4.mask = and <2 x i32> %b, <i32 1, i32 1>
+  %t10 = xor <2 x i32> %t4.mask, <i32 1, i32 1>
+  %t12 = and <2 x i32> %b, <i32 -2, i32 -2>
+  %t13 = or <2 x i32> %t12, %t10
+  ret <2 x i32> %t13
 }
 
 define <2 x i32> @test33vecb(<2 x i32> %b) {
 ; CHECK-LABEL: @test33vecb(
-; CHECK-NEXT:    [[TMP_13:%.*]] = xor <2 x i32> [[B:%.*]], <i32 1, i32 1>
-; CHECK-NEXT:    ret <2 x i32> [[TMP_13]]
+; CHECK-NEXT:    [[T13:%.*]] = xor <2 x i32> [[B:%.*]], <i32 1, i32 1>
+; CHECK-NEXT:    ret <2 x i32> [[T13]]
 ;
-  %tmp.4.mask = and <2 x i32> %b, <i32 1, i32 1>
-  %tmp.10 = xor <2 x i32> %tmp.4.mask, <i32 1, i32 1>
-  %tmp.12 = and <2 x i32> %b, <i32 -2, i32 -2>
-  %tmp.13 = or <2 x i32> %tmp.10, %tmp.12
-  ret <2 x i32> %tmp.13
+  %t4.mask = and <2 x i32> %b, <i32 1, i32 1>
+  %t10 = xor <2 x i32> %t4.mask, <i32 1, i32 1>
+  %t12 = and <2 x i32> %b, <i32 -2, i32 -2>
+  %t13 = or <2 x i32> %t10, %t12
+  ret <2 x i32> %t13
 }
 
 define i32 @test34(i32 %A, i32 %B) {
 ; CHECK-LABEL: @test34(
-; CHECK-NEXT:    ret i32 %B
+; CHECK-NEXT:    ret i32 [[B:%.*]]
 ;
-  %tmp.2 = or i32 %B, %A
-  %tmp.4 = and i32 %tmp.2, %B
-  ret i32 %tmp.4
+  %t2 = or i32 %B, %A
+  %t4 = and i32 %t2, %B
+  ret i32 %t4
 }
 
 ; FIXME: This test should only need -instsimplify (ValueTracking / computeKnownBits), not -instcombine.
@@ -465,10 +468,11 @@ define <2 x i32> @PR24942(<2 x i32> %x) {
 
 define i64 @test35(i32 %X) {
 ; CHECK-LABEL: @test35(
-; CHECK-NEXT:  %[[sub:.*]] = sub i32 0, %X
-; CHECK-NEXT:  %[[and:.*]] = and i32 %[[sub]], 240
-; CHECK-NEXT:  %[[cst:.*]] = zext i32 %[[and]] to i64
-; CHECK-NEXT:  ret i64 %[[cst]]
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 240
+; CHECK-NEXT:    [[RES:%.*]] = zext i32 [[TMP2]] to i64
+; CHECK-NEXT:    ret i64 [[RES]]
+;
   %zext = zext i32 %X to i64
   %zsub = sub i64 0, %zext
   %res = and i64 %zsub, 240
@@ -477,10 +481,11 @@ define i64 @test35(i32 %X) {
 
 define i64 @test36(i32 %X) {
 ; CHECK-LABEL: @test36(
-; CHECK-NEXT:  %[[sub:.*]] = add i32 %X, 7
-; CHECK-NEXT:  %[[and:.*]] = and i32 %[[sub]], 240
-; CHECK-NEXT:  %[[cst:.*]] = zext i32 %[[and]] to i64
-; CHECK-NEXT:  ret i64 %[[cst]]
+; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[X:%.*]], 7
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 240
+; CHECK-NEXT:    [[RES:%.*]] = zext i32 [[TMP2]] to i64
+; CHECK-NEXT:    ret i64 [[RES]]
+;
   %zext = zext i32 %X to i64
   %zsub = add i64 %zext, 7
   %res = and i64 %zsub, 240
@@ -489,10 +494,11 @@ define i64 @test36(i32 %X) {
 
 define i64 @test37(i32 %X) {
 ; CHECK-LABEL: @test37(
-; CHECK-NEXT:  %[[sub:.*]] = mul i32 %X, 7
-; CHECK-NEXT:  %[[and:.*]] = and i32 %[[sub]], 240
-; CHECK-NEXT:  %[[cst:.*]] = zext i32 %[[and]] to i64
-; CHECK-NEXT:  ret i64 %[[cst]]
+; CHECK-NEXT:    [[TMP1:%.*]] = mul i32 [[X:%.*]], 7
+; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 240
+; CHECK-NEXT:    [[RES:%.*]] = zext i32 [[TMP2]] to i64
+; CHECK-NEXT:    ret i64 [[RES]]
+;
   %zext = zext i32 %X to i64
   %zsub = mul i64 %zext, 7
   %res = and i64 %zsub, 240
@@ -501,9 +507,10 @@ define i64 @test37(i32 %X) {
 
 define i64 @test38(i32 %X) {
 ; CHECK-LABEL: @test38(
-; CHECK-NEXT:  %[[and:.*]] = and i32 %X, 240
-; CHECK-NEXT:  %[[cst:.*]] = zext i32 %[[and]] to i64
-; CHECK-NEXT:  ret i64 %[[cst]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 240
+; CHECK-NEXT:    [[RES:%.*]] = zext i32 [[TMP1]] to i64
+; CHECK-NEXT:    ret i64 [[RES]]
+;
   %zext = zext i32 %X to i64
   %zsub = xor i64 %zext, 7
   %res = and i64 %zsub, 240
@@ -512,9 +519,10 @@ define i64 @test38(i32 %X) {
 
 define i64 @test39(i32 %X) {
 ; CHECK-LABEL: @test39(
-; CHECK-NEXT:  %[[and:.*]] = and i32 %X, 240
-; CHECK-NEXT:  %[[cst:.*]] = zext i32 %[[and]] to i64
-; CHECK-NEXT:  ret i64 %[[cst]]
+; CHECK-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 240
+; CHECK-NEXT:    [[RES:%.*]] = zext i32 [[TMP1]] to i64
+; CHECK-NEXT:    ret i64 [[RES]]
+;
   %zext = zext i32 %X to i64
   %zsub = or i64 %zext, 7
   %res = and i64 %zsub, 240
@@ -836,3 +844,59 @@ define i1 @andn_or_cmp_4(i32 %a, i32 %b, i32 %c) {
   %and = and i1 %or, %x_inv
   ret i1 %and
 }
+
+define i32 @lowbitmask_casted_shift(i8 %x) {
+; CHECK-LABEL: @lowbitmask_casted_shift(
+; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[X:%.*]], 1
+; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i32
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[S]], 2147483647
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = ashr i8 %x, 1
+  %s = sext i8 %a to i32
+  %r = and i32 %s, 2147483647
+  ret i32 %r
+}
+
+define i32 @lowbitmask_casted_shift_use1(i8 %x) {
+; CHECK-LABEL: @lowbitmask_casted_shift_use1(
+; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[X:%.*]], 3
+; CHECK-NEXT:    call void @use8(i8 [[A]])
+; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i32
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[S]], 536870911
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = ashr i8 %x, 3
+  call void @use8(i8 %a)
+  %s = sext i8 %a to i32
+  %r = and i32 %s, 536870911
+  ret i32 %r
+}
+
+define i32 @lowbitmask_casted_shift_use2(i8 %x) {
+; CHECK-LABEL: @lowbitmask_casted_shift_use2(
+; CHECK-NEXT:    [[A:%.*]] = ashr i8 [[X:%.*]], 3
+; CHECK-NEXT:    [[S:%.*]] = sext i8 [[A]] to i32
+; CHECK-NEXT:    call void @use32(i32 [[S]])
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[S]], 536870911
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = ashr i8 %x, 3
+  %s = sext i8 %a to i32
+  call void @use32(i32 %s)
+  %r = and i32 %s, 536870911
+  ret i32 %r
+}
+
+define <2 x i59> @lowbitmask_casted_shift_vec_splat(<2 x i47> %x) {
+; CHECK-LABEL: @lowbitmask_casted_shift_vec_splat(
+; CHECK-NEXT:    [[A:%.*]] = ashr <2 x i47> [[X:%.*]], <i47 5, i47 5>
+; CHECK-NEXT:    [[S:%.*]] = sext <2 x i47> [[A]] to <2 x i59>
+; CHECK-NEXT:    [[R:%.*]] = and <2 x i59> [[S]], <i59 18014398509481983, i59 18014398509481983>
+; CHECK-NEXT:    ret <2 x i59> [[R]]
+;
+  %a = ashr <2 x i47> %x, <i47 5, i47 5>
+  %s = sext <2 x i47> %a to <2 x i59>
+  %r = and <2 x i59> %s, <i59 18014398509481983, i59 18014398509481983>  ;  -1 u>> 5 == 0x3f_ffff_ffff_ffff
+  ret <2 x i59> %r
+}