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Sometimes you want to disable a FileCheck directive without removing it entirely, or you want to write comments that mention a directive by name. The `COM:` directive makes it easy to do this. For example, you might have: ``` ; X32: pinsrd_1: ; X32: pinsrd $1, 4(%esp), %xmm0 ; COM: FIXME: X64 isn't working correctly yet for this part of codegen, but ; COM: X64 will have something similar to X32: ; COM: ; COM: X64: pinsrd_1: ; COM: X64: pinsrd $1, %edi, %xmm0 ``` Without this patch, you need to use some combination of rewording and directive syntax mangling to prevent FileCheck from recognizing the commented occurrences of `X32:` and `X64:` above as directives. Moreover, FileCheck diagnostics have been proposed that might complain about the occurrences of `X64` that don't have the trailing `:` because they look like directive typos: <http://lists.llvm.org/pipermail/llvm-dev/2020-April/140610.html> I think dodging all these problems can prove tedious for test authors, and directive syntax mangling already makes the purpose of existing test code unclear. `COM:` can avoid all these problems. This patch also updates the small set of existing tests that define `COM` as a check prefix: - clang/test/CodeGen/default-address-space.c - clang/test/CodeGenOpenCL/addr-space-struct-arg.cl - clang/test/Driver/hip-device-libs.hip - llvm/test/Assembler/drop-debug-info-nonzero-alloca.ll I think lit should support `COM:` as well. Perhaps `clang -verify` should too. Reviewed By: jhenderson, thopre Differential Revision: https://reviews.llvm.org/D79276 |
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