[PATCH] D38852: [Hexagon] Handling of new HVX flags and target-features

[Sumanth Gundapaneni via Phabricator via cfe-commits]

sgundapa created this revision.
Herald added a subscriber: eraman.

This patch has the following changes

1. A new flag "-mhvx-length={64B|128B}" is introduced to specify the

length of the vector. Previously we have used "-mhvx-double" for 128 Bytes.
This adds the target-feature "+hvx-length{64|128}b"

2. The "-mhvx" flag must be provided on command line to enable HVX for Hexagon.

If no -mhvx-length flag is specified, a default length is picked from the arch
mentioned in this priority order from either -mhvx=vxx or -mcpu. For v60 and v62 
the default length is 64 Byte. For unknown versions, the length is 128 Byte.
The -mhvx flag adds the target-feature "+hvxv{hvx_version}"

3. The 64 Byte mode is soon going to be deprecated. A warning is emitted if 64 Byte

is enabled. A warning is still emitted for the default 64 Byte as well. This warning
can be suppressed with a -Wno flag.

4. The "-mhvx-double" and "-mno-hvx-double" flags are deprecated. A warning is

emitted if the driver sees them on commandline. "-mhvx-double" is an alias to
"-mhvx-length=128B"

5. The compilation will error out if -mhvx-length is specified with out an

-mhvx/-mhvx= flag

6. The macro __HVX_LENGTH__ is defined and is set to the length of the

vector.
Eg: #define __HVX_LENGTH__ 64

7. The macro __HVX_ARCH__ is defined and is set to the version of the HVX.

Eg: #define __HVX_ARCH__ 62


Repository:
  rL LLVM

https://reviews.llvm.org/D38852

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  include/clang/Driver/Options.td
  lib/Basic/Targets/Hexagon.cpp
  lib/Basic/Targets/Hexagon.h
  lib/Driver/ToolChains/Clang.cpp
  lib/Driver/ToolChains/Hexagon.cpp
  lib/Driver/ToolChains/Hexagon.h
  test/CodeGen/hexagon-inline-asm.c
  test/Driver/hexagon-hvx.c
  test/Preprocessor/hexagon-predefines.c

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