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3 Commits

Author SHA1 Message Date
Craig Topper a2556bf44c [RISCV] Improve check prefixes in B extension tests. NFC 
-Add Z for the B extension subextensions.
-Don't mention I along with B or its sub extensions.

This is based on comments in D107817.

Differential Revision: https://reviews.llvm.org/D107992
 2021-08-12 12:41:40 -07:00
Craig Topper 8f5cd49405 [RISCV] Teach DAG combine what bits Zbp instructions demanded from their inputs. 
This teaches DAG combine that shift amount operands for grev, gorc
shfl, unshfl only read a few bits.

This also teaches DAG combine that grevw, gorcw, shflw, unshflw,
bcompressw, bdecompressw only consume the lower 32 bits of their
inputs.

In the future we can teach SimplifyDemandedBits to also propagate
demanded bits of the output to the inputs in some cases.
 2021-04-25 21:54:06 -07:00
Levy Hsu b49337bbb9 [RISCV] [1/2] Add IR intrinsic for Zbp extension 
RV32/64:
    grev
    grevi
    gorc
    gorci
    shfl
    shfli
    unshfl
    unshfli

RV64 ONLY:
    grevw
    greviw
    gorcw
    gorciw
    shflw
    shfli     (For non-existing shfliw)
    unshfli   (For non-existing unshfliw)

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D100830
 2021-04-22 16:34:51 -07:00