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1ba98aa252
In order to bring up scalable vector support in LLVM incrementally, we introduced behaviour to emit a warning, instead of an error, when asking the wrong question of a scalable vector, like asking for the fixed number of elements. This patch puts that behaviour under a flag. The default behaviour is that the compiler will always error, which means that all LLVM unit tests and regression tests will now fail when a code-path is taken that still uses the wrong interface. The behaviour to demote an error to a warning can be individually enabled for tools that want to support experimental use of scalable vectors. This patch enables that behaviour when driving compilation from Clang. This means that for users who want to try out scalable-vector support, fixed-width codegen support, or build user-code with scalable vector intrinsics, Clang will not crash and burn when the compiler encounters such a case. This allows us to do away with the following pattern in many of the SVE tests: RUN: .... 2>%t RUN: cat %t | FileCheck --check-prefix=WARN WARN-NOT: warning: ... The behaviour to emit warnings is only temporary and we expect this flag to be removed in the future when scalable vector support is more stable. This patch also has fixes the following tests: unittests: ScalableVectorMVTsTest.SizeQueries SelectionDAGAddressAnalysisTest.unknownSizeFrameObjects AArch64SelectionDAGTest.computeKnownBitsSVE_ZERO_EXTEND_VECTOR_INREG regression tests: Transforms/InstCombine/vscale_gep.ll Reviewed By: paulwalker-arm, ctetreau Differential Revision: https://reviews.llvm.org/D98856 |
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