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This patch adds optimization of the following patterns:
(zero_extend:M (subreg:N (not:O==M (X:Q==M)))) ->
(xor:M (zero_extend:M (subreg:N (X:M)), mask))
... where the mask is GET_MODE_MASK (N).
For the cases when X:M doesn't have any non-zero bits outside of mode N,
(zero_extend:M (subreg:N (X:M)) could be simplified to just (X:M)
and whole optimization will be:
(zero_extend:M (subreg:N (not:M (X:M)))) ->
(xor:M (X:M, mask))
Patch targets to handle code patterns like:
not a0,a0
andi a0,a0,0xff
to be optimized to:
xori a0,a0,255
Change was locally tested for x86_64 and AArch64 (as most common)
and for RV-64 and MIPS-32 targets (as having an effect from this optimization):
no regressions for all cases.
PR rtl-optimization/112398
gcc/ChangeLog:
* simplify-rtx.cc (simplify_context::simplify_unary_operation_1):
Simplify ZERO_EXTEND (SUBREG (NOT X)) to XOR (X, GET_MODE_MASK(SUBREG))
when X doesn't have any non-zero bits outside of SUBREG mode.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/pr112398.c: New test.
Signed-off-by: Alexey Merzlyakov <alexey.merzlyakov@samsung.com>
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