Hi, This is a simple fix for pr94574.
testcase testsuite/gcc.target/aarch64/sve/acle/general/deref_1.c ICEs when testing GCC trunk with -O2 -msve-vector-bits=256 -march=armv8.2-a+sve. There is a gimple statement before the ccp pass as follow: MEM[(svuint32_t *)&res] = _2; The ccp pass tries to convert this gimple into: _7 = VIEW_CONVERT_EXPR<vector(8) unsigned int>(_2); res_9 = BIT_INSERT_EXPR <res_8(D), _7, 0>; However, the size of _7 is larger than res_8(D) , leading to a verify_gimple failure. Since the replaced bits of BIT_INSERT_EXPR are supposed to fully inside the container, before doing the above optimitzaion, a check shall be added. With this fix, a MEM_REF which visits the address of a vector will be rewritten into a BIT_INSERT_EXPR only when the size of the vector is larger than the size of MEM_REF. In this way, this kind of ICE can be avoided. a test case with which this problem will be exposed more easily is extracted and added for this. Bootstrapped/regtested on both x86_64 and aarch64 Linux platform. Any suggestion? Thanks, Yang Yang gcc: +2020-04-13 Yang Yang <yangyang...@huawei.com> + + PR tree-optimization/94574 + * tree-ssa.c (non_rewritable_lvalue_p): Add size check when analyzing + whether a vector-insert is rewritable using a BIT_INSERT_EXPR. gcc/testsuite: +2020-04-13 Yang Yang <yangyang...@huawei.com> + + PR tree-optimization/94574 + * gcc.dg/pr94574.c: New test.
pr94574-v0.patch
Description: pr94574-v0.patch
