1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc -mtriple=x86_64-- < %s | FileCheck %s 3; These sequences don't need neg instructions; they can be done with 4; a single shift and sub each. 5 6define i64 @foo(i64 %x, i64 %y, i64 %n) nounwind { 7; CHECK-LABEL: foo: 8; CHECK: # %bb.0: 9; CHECK-NEXT: movq %rdx, %rcx 10; CHECK-NEXT: movq %rdi, %rax 11; CHECK-NEXT: # kill: def $cl killed $cl killed $rcx 12; CHECK-NEXT: shlq %cl, %rsi 13; CHECK-NEXT: subq %rsi, %rax 14; CHECK-NEXT: retq 15 %a = sub i64 0, %y 16 %b = shl i64 %a, %n 17 %c = add i64 %b, %x 18 ret i64 %c 19} 20define i64 @boo(i64 %x, i64 %y, i64 %n) nounwind { 21; CHECK-LABEL: boo: 22; CHECK: # %bb.0: 23; CHECK-NEXT: movq %rdx, %rcx 24; CHECK-NEXT: movq %rdi, %rax 25; CHECK-NEXT: # kill: def $cl killed $cl killed $rcx 26; CHECK-NEXT: shlq %cl, %rsi 27; CHECK-NEXT: subq %rsi, %rax 28; CHECK-NEXT: retq 29 %a = sub i64 0, %y 30 %b = shl i64 %a, %n 31 %c = add i64 %x, %b 32 ret i64 %c 33} 34