https://github.com/llvm/llvm-project/pull/70762 added support for new
loop attribute [[clang::code_align()]].
This patch fixes bugs for the test cases below that misses diagnostics due to discontinue to while loop during checking duplicate vs conflicting code_align attribute values in routine CheckForDuplicateLoopAttrs().
[[clang::code_align(4)]]
[[clang::code_align(4)]]
[[clang::code_align(8)]]
for(int I=0; I<128; ++I) { bar(I); }
[[clang::code_align(4)]]
[[clang::code_align(4)]]
[[clang::code_align(8)]]
[[clang::code_align(32)]]
for(int I=0; I<128; ++I) { bar(I); }
Lit test generates different outputs for usage of __int128_t in
clang-armv8-quick environment. This patch adds triple to fix the lit
failure.
```
Step 5 (ninja check 1) failure: 1 unexpected failures 38623 expected passes 71 expected failures 36752 unsupported tests (failure)
******************** TEST 'Clang :: Sema/code_align.c' FAILED ******************** Exit Code: 1
Command Output (stderr):
--
RUN: at line 1: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1 -internal-isystem /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/18/include -nostdsysteminc -fsyntax-only -verify=expected,c-local -x c /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1
+ -internal-isystem
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/18/inclu
+ de -nostdsysteminc -fsyntax-only -verify=expected,c-local -x c
+ /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code
+ _align.c
error: 'c-local-error' diagnostics expected but not seen:
File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c Line 79 (directive at /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c:78): 'code_align' attribute requires an integer argument which is a constant power of two between 1 and 4096 inclusive; provided argument was (__int128_t)1311768467294899680ULL << 64
File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c Line 89 (directive at /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c:88): 'code_align' attribute requires an integer argument which is a constant power of two between 1 and 4096 inclusive; provided argument was -(__int128_t)1311768467294899680ULL << 64
error: 'c-local-error' diagnostics seen but not expected:
File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c Line 79: use of undeclared identifier '__int128_t'
File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Sema/code_align.c Line 89: use of undeclared identifier '__int128_t'
4 errors generated.
```
This patch adds support for new loop attribute:
[[clang::code_align(N)]].
This attribute applies to a loop and specifies the byte alignment for a
loop.
The attribute accepts a positive integer constant initialization
expression
indicating the number of bytes for the minimum alignment boundary.
Its value must be a power of 2, between 1 and 4096 (inclusive).
