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[AArch64] Disable __ARM_FEATURE_SVE without ACLE.

Authored by sdesmalen on Jul 30 2019, 3:14 AM.

Description

[AArch64] Disable __ARM_FEATURE_SVE without ACLE.

The Arm C Language Extensions for SVE document specifies that
__ARM_FEATURE_SVE should be set when the compiler supports SVE and
implements all the extensions described in the document.

This is currently not yet the case, so the feature should be disabled
until the compiler can provide all the extensions as described.

Reviewers: c-rhodes, rengolin, rovka, ktkachov

Reviewed By: rengolin

Differential Revision: https://reviews.llvm.org/D65404

llvm-svn: 367301

Details