56 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py2; RUN: llc -mtriple=x86_64-linux-gnu -global-isel -verify-machineinstrs < %s -o - | FileCheck %s --check-prefix=X643 4define i16 @test_shl_i4(i16 %v, i16 %a, i16 %b) {5; Let's say the arguments are the following unsigned6; integers in two’s complement representation:7;8; %v: 77 (0000 0000 0100 1101)9; %a: 74 (0000 0000 0100 1010)10; %b: 72 (0000 0000 0100 1000)11; X64-LABEL: test_shl_i4:12; X64: # %bb.0:13; X64-NEXT: # kill: def $esi killed $esi def $rsi14; X64-NEXT: # kill: def $edx killed $edx def $rdx15; X64-NEXT: leal (%rdx,%rsi), %ecx16; X64-NEXT: andb $15, %cl17; X64-NEXT: # kill: def $cl killed $cl killed $ecx18; X64-NEXT: shlb %cl, %dil19; X64-NEXT: movzbl %dil, %eax20; X64-NEXT: andw $15, %ax21; X64-NEXT: # kill: def $ax killed $ax killed $eax22; X64-NEXT: retq23 %v.t = trunc i16 %v to i4 ; %v.t: 13 (1101)24 %a.t = trunc i16 %a to i4 ; %a.t: 10 (1010)25 %b.t = trunc i16 %b to i4 ; %b.t: 8 (1000)26 %n.t = add i4 %a.t, %b.t ; %n.t: 2 (0010)27 %r.t = shl i4 %v.t, %n.t ; %r.t: 4 (0100)28 %r = zext i4 %r.t to i1629; %r: 4 (0000 0000 0000 0100)30 ret i16 %r31 32; %di: 77 (0000 0000 0100 1101)33; %si: 74 (0000 0000 0100 1010)34; %dx: 72 (0000 0000 0100 1000)35; %dx: 146 (0000 0000 1001 0010)36; %dx: 2 (0000 0000 0000 0010)37; %cx: 2 (0000 0000 0000 0010)38; %di: 52 (0000 0000 0011 0100)39; %di: 4 (0000 0000 0000 0100)40; %ax: 4 (0000 0000 0000 0100)41; Let's pretend that legalizing G_SHL by widening its second42; source operand is done via G_ANYEXT rather than G_ZEXT and43; see what happens:44; addb %sil, %dl45; %dx: 146 (0000 0000 1001 0010)46; movl %edx, %ecx47; %cx: 146 (0000 0000 1001 0010)48; shlb %cl, %dil49; %di: 0 (0000 0000 0000 0000)50; andw $15, %di51; %di: 0 (0000 0000 0000 0000)52; movl %edi, %eax53; %ax: 0 (0000 0000 0000 0000)54; retq55}56