[PATCH 1/2] LoongArch: Support LA32R aliases rdcnt{vl,vh,id}.w

[Lulu Cai]

On 4/2/25 2:47 PM, Lulu Cai wrote:
> On 3/23/25 5:30 PM, WANG Xuerui wrote:
>> From: WANG Xuerui <git@xen0n.name>
>>
>> These LA32R instructions are in fact special cases of the LA32S/LA64
>> rdtime{l,h}.w (with only one output operand instead of two, the other
>> one being forced to $zero), but are named differently in the LA32R
>> ISA manual nevertheless.
>>
>> As the LA32R names are more memorable to a degree (especially for those
>> having difficulties remembering which operand corresponds to the node
>> ID), support them by making them aliases of the corresponding LA32S/LA64
>> instruction respectively, and make them render as such in disassembly.
>>
>> Signed-off-by: WANG Xuerui <git@xen0n.name>
>> ---
>>   gas/testsuite/gas/loongarch/fix_op.d        | 3 +++
>>   gas/testsuite/gas/loongarch/fix_op.s        | 5 +++++
>>   gas/testsuite/gas/loongarch/insn_alias_32.d | 3 +++
>>   gas/testsuite/gas/loongarch/insn_alias_32.s | 5 +++++
>>   opcodes/loongarch-opc.c                     | 6 ++++++
>>   5 files changed, 22 insertions(+)
>>
>> diff --git a/gas/testsuite/gas/loongarch/fix_op.d 
>> b/gas/testsuite/gas/loongarch/fix_op.d
>> index 7125f2e3309..05e7403d15c 100644
>> --- a/gas/testsuite/gas/loongarch/fix_op.d
>> +++ b/gas/testsuite/gas/loongarch/fix_op.d
>> @@ -132,3 +132,6 @@ Disassembly of section .text:
>>   [     ]+1e8:[     ]+00df04a4 [     ]+bstrpick.d[     ]+[ ]+\$a0, 
>> \$a1, 0x1f, 0x1
>>   [     ]+1ec:[     ]+00e000a4 [     ]+bstrpick.d[     ]+[ ]+\$a0, 
>> \$a1, 0x20, 0x0
>>   [     ]+1f0:[     ]+00ff00a4 [     ]+bstrpick.d[     ]+[ ]+\$a0, 
>> \$a1, 0x3f, 0x0
>> +[     ]+1f4:[     ]+00006004 [     ]+rdcntvl.w[     ]+[ ]+\$a0
>> +[     ]+1f8:[     ]+000060a0 [     ]+rdcntid.w[     ]+[ ]+\$a1
>> +[     ]+1fc:[     ]+00006404 [     ]+rdcntvh.w[     ]+[ ]+\$a0
>> diff --git a/gas/testsuite/gas/loongarch/fix_op.s 
>> b/gas/testsuite/gas/loongarch/fix_op.s
>> index d0523f959fb..876913bfdfb 100644
>> --- a/gas/testsuite/gas/loongarch/fix_op.s
>> +++ b/gas/testsuite/gas/loongarch/fix_op.s
>> @@ -123,3 +123,8 @@ bstrpick.d  $r4,$r5,0,0
>>   bstrpick.d  $r4,$r5,31,1
>>   bstrpick.d  $r4,$r5,32,0
>>   bstrpick.d  $r4,$r5,63,0
>> +
>> +# LA32R aliases
>> +rdcntvl.w  $r4
>> +rdcntid.w  $r5
>> +rdcntvh.w  $r4
>> diff --git a/gas/testsuite/gas/loongarch/insn_alias_32.d 
>> b/gas/testsuite/gas/loongarch/insn_alias_32.d
>> index 753eae7a8f9..d0e0679541e 100644
>> --- a/gas/testsuite/gas/loongarch/insn_alias_32.d
>> +++ b/gas/testsuite/gas/loongarch/insn_alias_32.d
>> @@ -17,3 +17,6 @@ Disassembly of section .text:
>>     18:    60000080     blt             \$a0, \$zero, 0    # 18 
>> <L1\+0x18>
>>     1c:    64000080     bge             \$a0, \$zero, 0    # 1c 
>> <L1\+0x1c>
>>     20:    64000004     bge             \$zero, \$a0, 0    # 20 
>> <L1\+0x20>
>> +  24:    00006004     rdtimel.w       $a0, $zero
>> +  28:    000060a0     rdtimel.w       $zero, $a1
>> +  2c:    00006406     rdtimeh.w       $a2, $zero
>
> A '\' is required before '$'.
>
ping.