[llvm] Adding support in llvm-exegesis for Aarch64 for handling FPR64/128, PPR16 and ZPR128 reg class. (PR #127564)

[via llvm-commits]

================
@@ -0,0 +1,45 @@
+REQUIRES: aarch64-registered-target
+
+## PPR Register Class Initialization Testcase
+## Ideally, we should use PTRUE_{B/H/S/D} instead of FADDV_VPZ_D for an isolated test case; however, Exegesis does not yet support PTRUE_{B/H/S/D}.
+RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D 2>&1 | FileCheck %s --check-prefix=PPR
+RUN: llvm-objdump -d %d > %t.s
+RUN: FileCheck %s --check-prefix=PPR_ASM < %t.s
+PPR-NOT: setRegTo is not implemented, results will be unreliable
+PPR: assembled_snippet: {{.*}}C0035FD6
+PPR_ASM: {{<foo>:}}
+PPR_ASM: ptrue p{{[0-9]+}}.b
+PPR_ASM-NEXT: dupm z{{[0-9]+}}.s, #0x1
+PPR_ASM-NEXT: faddv d{{[0-9]+}}, p{{[0-9]+}}, z{{[0-9]+}}
----------------
lakshayk-nv wrote:

> Can you give the other tests below a similar treatment?
>>
Cleaned up format in testfile. Only checking required assembly checks.

> PPR: assembled_snippet: {{.*}}C0035FD6
>>
No needed, Removed.
Just for reference, this checks for assembly snippet to end with return statement (`C0035FD6` is return instruction for aarch64) i.e "Check that we add ret instr to snippet" as one of the exegesis existing test case used, took inspiration from there.

> setRegTo is not implemented, results will be unreliable
and 
> PPR_ASM-NEXT: dupm z{{[0-9]+}}.s, #0x1
They check the same things using different commands. Thus removed.

Thanks!


https://github.com/llvm/llvm-project/pull/127564