GCC modified for the FreeChainXenon project
f4bf2aabe3
This patch folds certain reductions of X & CST to X[I] & CST[I] if I is the only nonzero element of CST. This includes the motivating case in which CST[I] is -1. We could do the same for REDUC_MAX on unsigned types, but I wasn't sure that that special case was worth it. 2019-01-07 Richard Sandiford <richard.sandiford@arm.com> gcc/ PR tree-optimization/88598 * tree.h (single_nonzero_element): Declare. * tree.c (single_nonzero_element): New function. * match.pd: Fold certain reductions of X & CST to X[I] & CST[I] if I is the only nonzero element of CST. gcc/testsuite/ PR tree-optimization/88598 * gcc.dg/vect/pr88598-1.c: New test. * gcc.dg/vect/pr88598-2.c: Likewise. * gcc.dg/vect/pr88598-3.c: Likewise. * gcc.dg/vect/pr88598-4.c: Likewise. * gcc.dg/vect/pr88598-5.c: Likewise. * gcc.dg/vect/pr88598-6.c: Likewise. From-SVN: r267646 |
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| MAINTAINERS | ||
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