1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=sccp -S | FileCheck %s 3 4; Test that SCCP has basic knowledge of when and/or/mul nuke overdefined values. 5 6 define i32 @test(i32 %X) { 7; CHECK-LABEL: @test( 8; CHECK-NEXT: ret i32 0 9; 10 %Y = and i32 %X, 0 11 ret i32 %Y 12} 13 14define i32 @test2(i32 %X) { 15; CHECK-LABEL: @test2( 16; CHECK-NEXT: ret i32 -1 17; 18 %Y = or i32 -1, %X 19 ret i32 %Y 20} 21 22define i32 @test3(i32 %X) { 23; CHECK-LABEL: @test3( 24; CHECK-NEXT: [[Y:%.*]] = and i32 undef, [[X:%.*]] 25; CHECK-NEXT: ret i32 [[Y]] 26; 27 %Y = and i32 undef, %X 28 ret i32 %Y 29} 30 31define i32 @test4(i32 %X) { 32; CHECK-LABEL: @test4( 33; CHECK-NEXT: [[Y:%.*]] = or i32 [[X:%.*]], undef 34; CHECK-NEXT: ret i32 [[Y]] 35; 36 %Y = or i32 %X, undef 37 ret i32 %Y 38} 39 40; X * 0 = 0 even if X is overdefined. 41define i32 @test5(i32 %foo) { 42; CHECK-LABEL: @test5( 43; CHECK-NEXT: ret i32 0 44; 45 %patatino = mul i32 %foo, 0 46 ret i32 %patatino 47} 48