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

[Lulu Cai]

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 '$'.