1*9880d681SAndroid Build Coastguard Worker; RUN: llc < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; Check that the shr(shl X, 56), 48) is not mistakenly turned into 4*9880d681SAndroid Build Coastguard Worker; a shr (X, -8) that gets subsequently "optimized away" as undef 5*9880d681SAndroid Build Coastguard Worker; PR4254 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Worker; after fixing PR24373 8*9880d681SAndroid Build Coastguard Worker; shlq $56, %rdi 9*9880d681SAndroid Build Coastguard Worker; sarq $48, %rdi 10*9880d681SAndroid Build Coastguard Worker; folds into 11*9880d681SAndroid Build Coastguard Worker; movsbq %dil, %rax 12*9880d681SAndroid Build Coastguard Worker; shlq $8, %rax 13*9880d681SAndroid Build Coastguard Worker; which is better for x86 14*9880d681SAndroid Build Coastguard Worker 15*9880d681SAndroid Build Coastguard Workertarget datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" 16*9880d681SAndroid Build Coastguard Workertarget triple = "x86_64-unknown-linux-gnu" 17*9880d681SAndroid Build Coastguard Worker 18*9880d681SAndroid Build Coastguard Workerdefine i64 @foo(i64 %b) nounwind readnone { 19*9880d681SAndroid Build Coastguard Workerentry: 20*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: foo: 21*9880d681SAndroid Build Coastguard Worker; CHECK: movsbq %dil, %rax 22*9880d681SAndroid Build Coastguard Worker; CHECK: shlq $8, %rax 23*9880d681SAndroid Build Coastguard Worker; CHECK: orq $1, %rax 24*9880d681SAndroid Build Coastguard Worker %shl = shl i64 %b, 56 ; <i64> [#uses=1] 25*9880d681SAndroid Build Coastguard Worker %shr = ashr i64 %shl, 48 ; <i64> [#uses=1] 26*9880d681SAndroid Build Coastguard Worker %add5 = or i64 %shr, 1 ; <i64> [#uses=1] 27*9880d681SAndroid Build Coastguard Worker ret i64 %add5 28*9880d681SAndroid Build Coastguard Worker} 29