[clang] [AArch64] Implement FP8 floating-point mode helper intrinsics (PR #100608)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux-qemu` running on `sanitizer-buildbot4` while building `clang` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/139/builds/5486

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
[305/310] Generating ../../bin/llvm-readelf
[306/310] Generating ../../bin/llvm-strip
[307/310] Linking CXX executable bin/llvm-objdump
[308/310] Linking CXX executable bin/sancov
[309/310] Linking CXX executable bin/llvm-nm
[309/310] Running the HWAddressSanitizer tests with Intel LAM
llvm-lit: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/lit.common.cfg.py:380: warning: %device_rm is not implemented
llvm-lit: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 108 of 109 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 
FAIL: HWAddressSanitizer-x86_64 :: TestCases/Posix/ignore_free_hook.cpp (57 of 108)
******************** TEST 'HWAddressSanitizer-x86_64 :: TestCases/Posix/ignore_free_hook.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/./bin/clang  --driver-mode=g++  -m64  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -mllvm -hwasan-generate-tags-with-calls=1 -mllvm -hwasan-globals -mllvm -hwasan-use-short-granules -mllvm -hwasan-instrument-landing-pads=0 -mllvm -hwasan-instrument-personality-functions -O2 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -o /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp -DTEST=basic_hook_works && not env SSH_CONTROL_SOCKET=/home/b/sanitizer-x86_64-linux-qemu/build/qemu_tmp/ssh-control-socket /home/b/sanitizer-x86_64-linux-qemu/sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/ssh_run.sh /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp    2>&1 | FileCheck /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -check-prefix=CHECK-BASIC
+ /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/./bin/clang --driver-mode=g++ -m64 -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -mllvm -hwasan-generate-tags-with-calls=1 -mllvm -hwasan-globals -mllvm -hwasan-use-short-granules -mllvm -hwasan-instrument-landing-pads=0 -mllvm -hwasan-instrument-personality-functions -O2 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -o /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp -DTEST=basic_hook_works
+ not env SSH_CONTROL_SOCKET=/home/b/sanitizer-x86_64-linux-qemu/build/qemu_tmp/ssh-control-socket /home/b/sanitizer-x86_64-linux-qemu/sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/ssh_run.sh /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp
+ FileCheck /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -check-prefix=CHECK-BASIC
/home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:45:18: error: CHECK-BASIC: expected string not found in input
 // CHECK-BASIC: Free Hook
                 ^
<stdin>:1:15: note: scanning from here
Free Respected
              ^
<stdin>:6:142: note: possible intended match here
 #2 0x55954f4178ca in basic_hook_works /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:46:13
                                                                                                                                             ^

Input file: <stdin>
Check file: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            1: Free Respected 
check:45'0                   X error: no match found
            2: ==673==ERROR: HWAddressSanitizer: tag-mismatch on address 0x742cfffe0000 at pc 0x55954f3ca46a 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            3: WRITE of size 1 at 0x742cfffe0000 tags: 11/12 (ptr/mem) in thread T0 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            4:  #0 0x55954f3ca46a in SigTrap<(__hwasan::ErrorAction)0, (__hwasan::AccessType)1, 0UL> /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/lib/hwasan/hwasan_checks.h:67:3 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            5:  #1 0x55954f3ca46a in __hwasan_store1 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/lib/hwasan/hwasan.cpp:589:3 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            6:  #2 0x55954f4178ca in basic_hook_works /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:46:13 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Step 30 (test hwasan x86_64_lam_qemu) failure: test hwasan x86_64_lam_qemu (failure)
...
[305/310] Generating ../../bin/llvm-readelf
[306/310] Generating ../../bin/llvm-strip
[307/310] Linking CXX executable bin/llvm-objdump
[308/310] Linking CXX executable bin/sancov
[309/310] Linking CXX executable bin/llvm-nm
[309/310] Running the HWAddressSanitizer tests with Intel LAM
llvm-lit: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/lit.common.cfg.py:380: warning: %device_rm is not implemented
llvm-lit: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 108 of 109 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 
FAIL: HWAddressSanitizer-x86_64 :: TestCases/Posix/ignore_free_hook.cpp (57 of 108)
******************** TEST 'HWAddressSanitizer-x86_64 :: TestCases/Posix/ignore_free_hook.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/./bin/clang  --driver-mode=g++  -m64  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -mllvm -hwasan-generate-tags-with-calls=1 -mllvm -hwasan-globals -mllvm -hwasan-use-short-granules -mllvm -hwasan-instrument-landing-pads=0 -mllvm -hwasan-instrument-personality-functions -O2 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -o /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp -DTEST=basic_hook_works && not env SSH_CONTROL_SOCKET=/home/b/sanitizer-x86_64-linux-qemu/build/qemu_tmp/ssh-control-socket /home/b/sanitizer-x86_64-linux-qemu/sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/ssh_run.sh /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp    2>&1 | FileCheck /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -check-prefix=CHECK-BASIC
+ /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/./bin/clang --driver-mode=g++ -m64 -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -mllvm -hwasan-generate-tags-with-calls=1 -mllvm -hwasan-globals -mllvm -hwasan-use-short-granules -mllvm -hwasan-instrument-landing-pads=0 -mllvm -hwasan-instrument-personality-functions -O2 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -o /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp -DTEST=basic_hook_works
+ not env SSH_CONTROL_SOCKET=/home/b/sanitizer-x86_64-linux-qemu/build/qemu_tmp/ssh-control-socket /home/b/sanitizer-x86_64-linux-qemu/sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/ssh_run.sh /home/b/sanitizer-x86_64-linux-qemu/build/llvm_build2_x86_64_lam_qemu/projects/compiler-rt/test/hwasan/X86_64/TestCases/Posix/Output/ignore_free_hook.cpp.tmp
+ FileCheck /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp -check-prefix=CHECK-BASIC
/home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:45:18: error: CHECK-BASIC: expected string not found in input
 // CHECK-BASIC: Free Hook
                 ^
<stdin>:1:15: note: scanning from here
Free Respected
              ^
<stdin>:6:142: note: possible intended match here
 #2 0x55954f4178ca in basic_hook_works /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:46:13
                                                                                                                                             ^

Input file: <stdin>
Check file: /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            1: Free Respected 
check:45'0                   X error: no match found
            2: ==673==ERROR: HWAddressSanitizer: tag-mismatch on address 0x742cfffe0000 at pc 0x55954f3ca46a 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            3: WRITE of size 1 at 0x742cfffe0000 tags: 11/12 (ptr/mem) in thread T0 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            4:  #0 0x55954f3ca46a in SigTrap<(__hwasan::ErrorAction)0, (__hwasan::AccessType)1, 0UL> /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/lib/hwasan/hwasan_checks.h:67:3 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            5:  #1 0x55954f3ca46a in __hwasan_store1 /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/lib/hwasan/hwasan.cpp:589:3 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            6:  #2 0x55954f4178ca in basic_hook_works /home/b/sanitizer-x86_64-linux-qemu/build/llvm-project/compiler-rt/test/hwasan/TestCases/Posix/ignore_free_hook.cpp:46:13 
check:45'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

```

</details>

https://github.com/llvm/llvm-project/pull/100608