; This test makes sure that these instructions are properly eliminated. ; ; RUN: opt < %s -instcombine -S | not grep and define i32 @test1(i32 %A) { ; zero result %B = and i32 %A, 0 ; <i32> [#uses=1] ret i32 %B } define i32 @test2(i32 %A) { ; noop %B = and i32 %A, -1 ; <i32> [#uses=1] ret i32 %B } define i1 @test3(i1 %A) { ; always = false %B = and i1 %A, false ; <i1> [#uses=1] ret i1 %B } define i1 @test4(i1 %A) { ; noop %B = and i1 %A, true ; <i1> [#uses=1] ret i1 %B } define i32 @test5(i32 %A) { %B = and i32 %A, %A ; <i32> [#uses=1] ret i32 %B } define i1 @test6(i1 %A) { %B = and i1 %A, %A ; <i1> [#uses=1] ret i1 %B } ; A & ~A == 0 define i32 @test7(i32 %A) { %NotA = xor i32 %A, -1 ; <i32> [#uses=1] %B = and i32 %A, %NotA ; <i32> [#uses=1] ret i32 %B } ; AND associates define i8 @test8(i8 %A) { %B = and i8 %A, 3 ; <i8> [#uses=1] %C = and i8 %B, 4 ; <i8> [#uses=1] ret i8 %C } define i1 @test9(i32 %A) { ; Test of sign bit, convert to setle %A, 0 %B = and i32 %A, -2147483648 ; <i32> [#uses=1] %C = icmp ne i32 %B, 0 ; <i1> [#uses=1] ret i1 %C } define i1 @test9a(i32 %A) { ; Test of sign bit, convert to setle %A, 0 %B = and i32 %A, -2147483648 ; <i32> [#uses=1] %C = icmp ne i32 %B, 0 ; <i1> [#uses=1] ret i1 %C } define i32 @test10(i32 %A) { %B = and i32 %A, 12 ; <i32> [#uses=1] %C = xor i32 %B, 15 ; <i32> [#uses=1] ; (X ^ C1) & C2 --> (X & C2) ^ (C1&C2) %D = and i32 %C, 1 ; <i32> [#uses=1] ret i32 %D } define i32 @test11(i32 %A, i32* %P) { %B = or i32 %A, 3 ; <i32> [#uses=1] %C = xor i32 %B, 12 ; <i32> [#uses=2] ; additional use of C store i32 %C, i32* %P ; %C = and uint %B, 3 --> 3 %D = and i32 %C, 3 ; <i32> [#uses=1] ret i32 %D } define i1 @test12(i32 %A, i32 %B) { %C1 = icmp ult i32 %A, %B ; <i1> [#uses=1] %C2 = icmp ule i32 %A, %B ; <i1> [#uses=1] ; (A < B) & (A <= B) === (A < B) %D = and i1 %C1, %C2 ; <i1> [#uses=1] ret i1 %D } define i1 @test13(i32 %A, i32 %B) { %C1 = icmp ult i32 %A, %B ; <i1> [#uses=1] %C2 = icmp ugt i32 %A, %B ; <i1> [#uses=1] ; (A < B) & (A > B) === false %D = and i1 %C1, %C2 ; <i1> [#uses=1] ret i1 %D } define i1 @test14(i8 %A) { %B = and i8 %A, -128 ; <i8> [#uses=1] %C = icmp ne i8 %B, 0 ; <i1> [#uses=1] ret i1 %C } define i8 @test15(i8 %A) { %B = lshr i8 %A, 7 ; <i8> [#uses=1] ; Always equals zero %C = and i8 %B, 2 ; <i8> [#uses=1] ret i8 %C } define i8 @test16(i8 %A) { %B = shl i8 %A, 2 ; <i8> [#uses=1] %C = and i8 %B, 3 ; <i8> [#uses=1] ret i8 %C } ;; ~(~X & Y) --> (X | ~Y) define i8 @test17(i8 %X, i8 %Y) { %B = xor i8 %X, -1 ; <i8> [#uses=1] %C = and i8 %B, %Y ; <i8> [#uses=1] %D = xor i8 %C, -1 ; <i8> [#uses=1] ret i8 %D } define i1 @test18(i32 %A) { %B = and i32 %A, -128 ; <i32> [#uses=1] ;; C >= 128 %C = icmp ne i32 %B, 0 ; <i1> [#uses=1] ret i1 %C } define i1 @test18a(i8 %A) { %B = and i8 %A, -2 ; <i8> [#uses=1] %C = icmp eq i8 %B, 0 ; <i1> [#uses=1] ret i1 %C } define i32 @test19(i32 %A) { %B = shl i32 %A, 3 ; <i32> [#uses=1] ;; Clearing a zero bit %C = and i32 %B, -2 ; <i32> [#uses=1] ret i32 %C } define i8 @test20(i8 %A) { %C = lshr i8 %A, 7 ; <i8> [#uses=1] ;; Unneeded %D = and i8 %C, 1 ; <i8> [#uses=1] ret i8 %D } define i1 @test22(i32 %A) { %B = icmp eq i32 %A, 1 ; <i1> [#uses=1] %C = icmp sge i32 %A, 3 ; <i1> [#uses=1] ;; false %D = and i1 %B, %C ; <i1> [#uses=1] ret i1 %D } define i1 @test23(i32 %A) { %B = icmp sgt i32 %A, 1 ; <i1> [#uses=1] %C = icmp sle i32 %A, 2 ; <i1> [#uses=1] ;; A == 2 %D = and i1 %B, %C ; <i1> [#uses=1] ret i1 %D } define i1 @test24(i32 %A) { %B = icmp sgt i32 %A, 1 ; <i1> [#uses=1] %C = icmp ne i32 %A, 2 ; <i1> [#uses=1] ;; A > 2 %D = and i1 %B, %C ; <i1> [#uses=1] ret i1 %D } define i1 @test25(i32 %A) { %B = icmp sge i32 %A, 50 ; <i1> [#uses=1] %C = icmp slt i32 %A, 100 ; <i1> [#uses=1] ;; (A-50) <u 50 %D = and i1 %B, %C ; <i1> [#uses=1] ret i1 %D } define i1 @test26(i32 %A) { %B = icmp ne i32 %A, 50 ; <i1> [#uses=1] %C = icmp ne i32 %A, 51 ; <i1> [#uses=1] ;; (A-50) > 1 %D = and i1 %B, %C ; <i1> [#uses=1] ret i1 %D } define i8 @test27(i8 %A) { %B = and i8 %A, 4 ; <i8> [#uses=1] %C = sub i8 %B, 16 ; <i8> [#uses=1] ;; 0xF0 %D = and i8 %C, -16 ; <i8> [#uses=1] %E = add i8 %D, 16 ; <i8> [#uses=1] ret i8 %E } ;; This is juse a zero extending shr. define i32 @test28(i32 %X) { ;; Sign extend %Y = ashr i32 %X, 24 ; <i32> [#uses=1] ;; Mask out sign bits %Z = and i32 %Y, 255 ; <i32> [#uses=1] ret i32 %Z } define i32 @test29(i8 %X) { %Y = zext i8 %X to i32 ; <i32> [#uses=1] ;; Zero extend makes this unneeded. %Z = and i32 %Y, 255 ; <i32> [#uses=1] ret i32 %Z } define i32 @test30(i1 %X) { %Y = zext i1 %X to i32 ; <i32> [#uses=1] %Z = and i32 %Y, 1 ; <i32> [#uses=1] ret i32 %Z } define i32 @test31(i1 %X) { %Y = zext i1 %X to i32 ; <i32> [#uses=1] %Z = shl i32 %Y, 4 ; <i32> [#uses=1] %A = and i32 %Z, 16 ; <i32> [#uses=1] ret i32 %A } define i32 @test32(i32 %In) { %Y = and i32 %In, 16 ; <i32> [#uses=1] %Z = lshr i32 %Y, 2 ; <i32> [#uses=1] %A = and i32 %Z, 1 ; <i32> [#uses=1] ret i32 %A } ;; Code corresponding to one-bit bitfield ^1. define i32 @test33(i32 %b) { %tmp.4.mask = and i32 %b, 1 ; <i32> [#uses=1] %tmp.10 = xor i32 %tmp.4.mask, 1 ; <i32> [#uses=1] %tmp.12 = and i32 %b, -2 ; <i32> [#uses=1] %tmp.13 = or i32 %tmp.12, %tmp.10 ; <i32> [#uses=1] ret i32 %tmp.13 } define i32 @test34(i32 %A, i32 %B) { %tmp.2 = or i32 %B, %A ; <i32> [#uses=1] %tmp.4 = and i32 %tmp.2, %B ; <i32> [#uses=1] ret i32 %tmp.4 }