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This patch implements constant folding for svdiv: The new function aarch64_const_binop was created, which - in contrast to int_const_binop - does not treat operations as overflowing. This function is passed as callback to vector_const_binop from the new gimple_folder method fold_const_binary, if the predicate is ptrue or predication is _x. From svdiv_impl::fold, fold_const_binary is called with TRUNC_DIV_EXPR as tree_code. In aarch64_const_binop, a case was added for TRUNC_DIV_EXPR to return 0 for division by 0, as defined in the semantics for svdiv. Tests were added to check the produced assembly for different predicates, signed and unsigned integers, and the svdiv_n_* case. The patch was bootstrapped and regtested on aarch64-linux-gnu, no regression. OK for mainline? Signed-off-by: Jennifer Schmitz <jschmitz@nvidia.com> gcc/ * config/aarch64/aarch64-sve-builtins-base.cc (svdiv_impl::fold): Try constant folding. * config/aarch64/aarch64-sve-builtins.h: Declare gimple_folder::fold_const_binary. * config/aarch64/aarch64-sve-builtins.cc (aarch64_const_binop): New function to fold binary SVE intrinsics without overflow. (gimple_folder::fold_const_binary): New helper function for constant folding of SVE intrinsics. gcc/testsuite/ * gcc.target/aarch64/sve/const_fold_div_1.c: New test. |
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