1*9880d681SAndroid Build Coastguard Worker; RUN: llc < %s -march=x86 | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; When doing sign extension, use the sext-load lowering to take advantage of 4*9880d681SAndroid Build Coastguard Worker; x86's sign extension during loads. 5*9880d681SAndroid Build Coastguard Worker; 6*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: test1: 7*9880d681SAndroid Build Coastguard Worker; CHECK: movsbl {{.*}}, %eax 8*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: ret 9*9880d681SAndroid Build Coastguard Workerdefine i32 @test1(i32 %X) nounwind { 10*9880d681SAndroid Build Coastguard Workerentry: 11*9880d681SAndroid Build Coastguard Worker %tmp12 = trunc i32 %X to i8 ; <i8> [#uses=1] 12*9880d681SAndroid Build Coastguard Worker %tmp123 = sext i8 %tmp12 to i32 ; <i32> [#uses=1] 13*9880d681SAndroid Build Coastguard Worker ret i32 %tmp123 14*9880d681SAndroid Build Coastguard Worker} 15*9880d681SAndroid Build Coastguard Worker 16*9880d681SAndroid Build Coastguard Worker; When using a sextload representation, ensure that the sign extension is 17*9880d681SAndroid Build Coastguard Worker; preserved even when removing shifted-out low bits. 18*9880d681SAndroid Build Coastguard Worker; 19*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: test2: 20*9880d681SAndroid Build Coastguard Worker; CHECK: movswl {{.*}}, %eax 21*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: ret 22*9880d681SAndroid Build Coastguard Workerdefine i32 @test2({i16, [6 x i8]}* %this) { 23*9880d681SAndroid Build Coastguard Workerentry: 24*9880d681SAndroid Build Coastguard Worker %b48 = getelementptr inbounds { i16, [6 x i8] }, { i16, [6 x i8] }* %this, i32 0, i32 1 25*9880d681SAndroid Build Coastguard Worker %cast = bitcast [6 x i8]* %b48 to i48* 26*9880d681SAndroid Build Coastguard Worker %bf.load = load i48, i48* %cast, align 2 27*9880d681SAndroid Build Coastguard Worker %bf.ashr = ashr i48 %bf.load, 32 28*9880d681SAndroid Build Coastguard Worker %bf.cast = trunc i48 %bf.ashr to i32 29*9880d681SAndroid Build Coastguard Worker ret i32 %bf.cast 30*9880d681SAndroid Build Coastguard Worker} 31