HexagonISD::PFALSE and PTRUE patterns do not form independently in
general as they are treated like operands of all 0s or all 1s. Eg: i32 =
transfer HEXAGONISD::PFALSE.
In this case, v8i1 = HEXAGONISD::PFALSE is formed independently without
accompanying opcode.
This patch adds a pattern to transfer all 0s or all 1s to a scalar
register and then use that register and this PFALSE/PTRUE opcode to
transfer to a predicate register like v8i1.
Similar to 806761a7629df268c8aed49657aeccffa6bca449
-mtriple= specifies the full target triple while -march= merely sets the
architecture part of the default target triple, leaving a target triple which
may not make sense.
Therefore, -march= is error-prone and not recommended for tests without a target
triple. The issue has been benign as we recognize $unknown-apple-darwin as ELF instead
of rejecting it outrightly.
This happens when CMP1 and CMP3 have the same predicate (or CMP2 and CMP3 have
the same predicate).
This helps optimizations such as the fololowing one:
CMP(A,C)||CMP(B,C) => CMP(MIN/MAX(A,B), C)
CMP(A,C)&&CMP(B,C) => CMP(MIN/MAX(A,B), C)
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D156215
'not' expands to checking for an xor with a -1 constant. Since
this looks for a ConstantSDNode it will never match for a vector.
Co-authored-by: Craig Topper <craig.topper@sifive.com>
Differential Revision: https://reviews.llvm.org/D100687
