Commit Graph

5 Commits

Author SHA1 Message Date
Matt Arsenault dfa9420f09 AMDGPU/GlobalISel: Don't use legal v2s16 G_BUILD_VECTOR
If we have s_pack_* instructions, legalize this to
G_BUILD_VECTOR_TRUNC from s32 elements. This is closer to how how the
s_pack_* instructions really behave.

If we don't have s_pack_ instructions, expand this by creating a merge
to s32 and bitcasting. This expands to the expected bit operations. I
think this eventually should go in a new bitcast legalize action type
in LegalizerHelper.

We already directly emit the shift operations in RegBankSelect for the
vector case. This could possibly be cleaned up, but I also may want to
defer doing this expansion to selection anyway. I'll see about that
when I try to actually match VOP3P instructions.

This breaks the selection of the build_vector since tablegen doesn't
know how to match G_BUILD_VECTOR_TRUNC yet, so just xfail it for now.
2020-02-05 11:52:18 -05:00
Petar Avramovic 98f72a5107 [MIPS GlobalISel] Select bitreverse. Recommit
G_BITREVERSE is generated from llvm.bitreverse.<type> intrinsics,
clang genrates these intrinsics from __builtin_bitreverse32 and
__builtin_bitreverse64.
Add lower and narrowscalar for G_BITREVERSE.
Lower G_BITREVERSE on MIPS32.

Recommit notes:
Introduce temporary variables in order to make sure
instructions get inserted into MachineFunction in same order
regardless of compiler used to build llvm.

Differential Revision: https://reviews.llvm.org/D71363
2019-12-30 18:06:29 +01:00
Dmitri Gribenko 32cc14100e Revert "[MIPS GlobalISel] Select bitreverse"
This reverts commit dbc136e0fe.
It broke buildbots:
http://lab.llvm.org:8011/builders/clang-x86_64-debian-fast/builds/21066
2019-12-30 14:29:47 +01:00
Petar Avramovic dbc136e0fe [MIPS GlobalISel] Select bitreverse
G_BITREVERSE is generated from llvm.bitreverse.<type> intrinsics,
clang genrates these intrinsics from __builtin_bitreverse32 and
__builtin_bitreverse64.
Add lower and narrowscalar for G_BITREVERSE.
Lower G_BITREVERSE on MIPS32.

Differential Revision: https://reviews.llvm.org/D71363
2019-12-30 11:26:45 +01:00
Matt Arsenault 5ff310e298 GlobalISel: Add basic legalization for G_BITREVERSE
llvm-svn: 370979
2019-09-04 20:46:15 +00:00