44 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py2; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s3 4define i64 @foo(i64 %x, i64 %y) {5; CHECK-LABEL: foo:6; CHECK: # %bb.0:7; CHECK-NEXT: bsrq %rdi, %rcx8; CHECK-NEXT: orq $64, %rcx9; CHECK-NEXT: bsrq %rsi, %rcx10; CHECK-NEXT: movl $63, %eax11; CHECK-NEXT: subq %rcx, %rax12; CHECK-NEXT: retq13 %1 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)14 %2 = xor i64 %1, 12715 %3 = tail call i64 @llvm.ctlz.i64(i64 %y, i1 true)16 %4 = xor i64 %3, 6317 %5 = icmp eq i64 %y, 018 %6 = select i1 %5, i64 %2, i64 %419 %7 = sub nsw i64 63, %620 ret i64 %721}22 23define i64 @bar(i64 %x, i64 %y) {24; CHECK-LABEL: bar:25; CHECK: # %bb.0:26; CHECK-NEXT: movl $127, %ecx27; CHECK-NEXT: bsrq %rdi, %rcx28; CHECK-NEXT: xorq $64, %rcx29; CHECK-NEXT: bsrq %rsi, %rcx30; CHECK-NEXT: movl $63, %eax31; CHECK-NEXT: subq %rcx, %rax32; CHECK-NEXT: retq33 %1 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)34 %2 = xor i64 %1, 12735 %3 = tail call i64 @llvm.ctlz.i64(i64 %y, i1 false)36 %4 = xor i64 %3, 6337 %5 = icmp eq i64 %y, 038 %6 = select i1 %5, i64 %2, i64 %439 %7 = sub nsw i64 63, %640 ret i64 %741}42 43declare i64 @llvm.ctlz.i64(i64, i1)44