[X86] Teach assembler parser to accept lsl and lar with a 64 or 32 source register when the destination is a 64 register.

Previously we only accepted a 32-bit source with a 64-bit dest.

Accepting 64-bit as well is more consistent with gas behavior. I
think maybe we should accept 16 bit register as well, but I'm not
sure.

Author: topperc

llvm/lib/Target/X86/X86InstrSystem.td

@@ -223,7 +223,7 @@ def LAR32rr : I<0x02, MRMSrcReg, (outs GR32:$dst), (ins GR32:$src),
 let mayLoad = 1 in
 def LAR64rm : RI<0x02, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src),
                  "lar{q}\t{$src, $dst|$dst, $src}", []>, TB, NotMemoryFoldable;
-def LAR64rr : RI<0x02, MRMSrcReg, (outs GR64:$dst), (ins GR32:$src),
+def LAR64rr : RI<0x02, MRMSrcReg, (outs GR64:$dst), (ins GR32orGR64:$src),
                  "lar{q}\t{$src, $dst|$dst, $src}", []>, TB, NotMemoryFoldable;
 
 // i16mem operand in LSL32rm and GR32 operand in LSL32rr is not a typo.
@@ -245,7 +245,7 @@ def LSL32rr : I<0x03, MRMSrcReg, (outs GR32:$dst), (ins GR32:$src),
 let mayLoad = 1 in
 def LSL64rm : RI<0x03, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src),
                  "lsl{q}\t{$src, $dst|$dst, $src}", []>, TB, NotMemoryFoldable;
-def LSL64rr : RI<0x03, MRMSrcReg, (outs GR64:$dst), (ins GR32:$src),
+def LSL64rr : RI<0x03, MRMSrcReg, (outs GR64:$dst), (ins GR32orGR64:$src),
                  "lsl{q}\t{$src, $dst|$dst, $src}", []>, TB, NotMemoryFoldable;
 
 def INVLPG : I<0x01, MRM7m, (outs), (ins i8mem:$addr), "invlpg\t$addr", []>, TB;

llvm/test/MC/X86/I286-64.s

@@ -32,6 +32,10 @@ larl %r13d, %r13d
 // CHECK: encoding: [0x44,0x0f,0x02,0x2a]        
 larl (%rdx), %r13d 
 
+// CHECK: larq %eax, %rax
+// CHECK: encoding: [0x48,0x0f,0x02,0xc0]        
+lar %rax, %rax
+
 // CHECK: lgdtq 485498096 
 // CHECK: encoding: [0x0f,0x01,0x14,0x25,0xf0,0x1c,0xf0,0x1c]         
 lgdtq 485498096 
@@ -164,6 +168,10 @@ lsll %r13d, %r13d
 // CHECK: encoding: [0x44,0x0f,0x03,0x2a]        
 lsll (%rdx), %r13d 
 
+// CHECK: lslq %eax, %rax
+// CHECK: encoding: [0x48,0x0f,0x03,0xc0]
+lsl %rax, %rax
+
 // CHECK: ltrw 485498096 
 // CHECK: encoding: [0x0f,0x00,0x1c,0x25,0xf0,0x1c,0xf0,0x1c]         
 ltrw 485498096