| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=x86_64-linux-gnu -global-isel -verify-machineinstrs < %s -o - | FileCheck %s --check-prefix=X64 |
| |
| define i16 @test_shl_i4(i16 %v, i16 %a, i16 %b) { |
| ; Let's say the arguments are the following unsigned |
| ; integers in two’s complement representation: |
| ; |
| ; %v: 77 (0000 0000 0100 1101) |
| ; %a: 74 (0000 0000 0100 1010) |
| ; %b: 72 (0000 0000 0100 1000) |
| ; X64-LABEL: test_shl_i4: |
| ; X64: # %bb.0: |
| ; X64-NEXT: # kill: def $esi killed $esi def $rsi |
| ; X64-NEXT: # kill: def $edx killed $edx def $rdx |
| ; X64-NEXT: leal (%rdx,%rsi), %ecx |
| ; X64-NEXT: andb $15, %cl |
| ; X64-NEXT: # kill: def $cl killed $cl killed $ecx |
| ; X64-NEXT: shlb %cl, %dil |
| ; X64-NEXT: movzbl %dil, %eax |
| ; X64-NEXT: andw $15, %ax |
| ; X64-NEXT: # kill: def $ax killed $ax killed $eax |
| ; X64-NEXT: retq |
| %v.t = trunc i16 %v to i4 ; %v.t: 13 (1101) |
| %a.t = trunc i16 %a to i4 ; %a.t: 10 (1010) |
| %b.t = trunc i16 %b to i4 ; %b.t: 8 (1000) |
| %n.t = add i4 %a.t, %b.t ; %n.t: 2 (0010) |
| %r.t = shl i4 %v.t, %n.t ; %r.t: 4 (0100) |
| %r = zext i4 %r.t to i16 |
| ; %r: 4 (0000 0000 0000 0100) |
| ret i16 %r |
| |
| ; %di: 77 (0000 0000 0100 1101) |
| ; %si: 74 (0000 0000 0100 1010) |
| ; %dx: 72 (0000 0000 0100 1000) |
| ; %dx: 146 (0000 0000 1001 0010) |
| ; %dx: 2 (0000 0000 0000 0010) |
| ; %cx: 2 (0000 0000 0000 0010) |
| ; %di: 52 (0000 0000 0011 0100) |
| ; %di: 4 (0000 0000 0000 0100) |
| ; %ax: 4 (0000 0000 0000 0100) |
| ; Let's pretend that legalizing G_SHL by widening its second |
| ; source operand is done via G_ANYEXT rather than G_ZEXT and |
| ; see what happens: |
| ; addb %sil, %dl |
| ; %dx: 146 (0000 0000 1001 0010) |
| ; movl %edx, %ecx |
| ; %cx: 146 (0000 0000 1001 0010) |
| ; shlb %cl, %dil |
| ; %di: 0 (0000 0000 0000 0000) |
| ; andw $15, %di |
| ; %di: 0 (0000 0000 0000 0000) |
| ; movl %edi, %eax |
| ; %ax: 0 (0000 0000 0000 0000) |
| ; retq |
| } |