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llvm-project/clang/test/CodeGen/asm-parser-info.S

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[MC] Change AsmParser to leverage Assembler during evaluation Teach AsmParser to check with Assembler for when evaluating constant expressions. This improves the handing of preprocessor expressions that must be resolved at parse time. This idiom can be found as assembling-time assertion checks in source-level assemblers. Note that this relies on the MCStreamer to keep sufficient tabs on Section / Fragment information which the MCAsmStreamer does not. As a result the textual output may fail where the equivalent object generation would pass. This can most easily be resolved by folding the MCAsmStreamer and MCObjectStreamer together which is planned for in a separate patch. Currently, this feature is only enabled for assembly input, keeping IR compilation consistent between assembly and object generation. Reviewers: echristo, rnk, probinson, espindola, peter.smith Reviewed By: peter.smith Subscribers: eraman, peter.smith, arichardson, jyknight, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D45164 llvm-svn: 331218
2018-05-01 03:22:40 +08:00
// REQUIRES: x86-registered-target
// RUN: %clang --target=x86_64-unknown-linux-gnu -c %s -o /dev/null
// Check that cc1as can use assembler info in object generation.
.data
foo:
.if . - foo == 0
.byte 0xaa
.else
.byte 0x00
.endif