From c6f38e5e6d900b8ed6a4f5c126d3197946cad4dd Mon Sep 17 00:00:00 2001 From: YunQiang Su Date: Thu, 11 Jul 2024 20:43:54 +0800 Subject: [PATCH] RISC-V: NO_WARNING preferred else value for RVV PR target/115840. In riscv_preferred_else_value, we create an uninitialized tmp var for else value, instead of the 0 (as default_preferred_else_value) or the pre-exists VAR (as aarch64 does), so that we can use agnostic policy. The problem is that `warn_uninit` will emit a warning: '({anonymous})' may be used uninitialized Let's mark this tmp var as NO_WARNING. This problem is found when I try to build glibc with V extension. gcc PR target/115840 * config/riscv/riscv.cc(riscv_preferred_else_value): Mark tmp_var as NO_WARNING. gcc/testsuite * gcc.dg/vect/pr115840.c: New testcase. --- gcc/config/riscv/riscv.cc | 6 +++++- gcc/testsuite/gcc.dg/vect/pr115840.c | 11 +++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/vect/pr115840.c diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc index 16b210f323e..d50ac611e1a 100644 --- a/gcc/config/riscv/riscv.cc +++ b/gcc/config/riscv/riscv.cc @@ -11432,7 +11432,11 @@ riscv_preferred_else_value (unsigned ifn, tree vectype, unsigned int nops, tree *ops) { if (riscv_v_ext_mode_p (TYPE_MODE (vectype))) - return get_or_create_ssa_default_def (cfun, create_tmp_var (vectype)); + { + tree tmp_var = create_tmp_var (vectype); + TREE_NO_WARNING (tmp_var) = 1; + return get_or_create_ssa_default_def (cfun, tmp_var); + } return default_preferred_else_value (ifn, vectype, nops, ops); } diff --git a/gcc/testsuite/gcc.dg/vect/pr115840.c b/gcc/testsuite/gcc.dg/vect/pr115840.c new file mode 100644 index 00000000000..09dc9e4eb7c --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/pr115840.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-Wall -Werror" } */ + +double loads[16]; + +void +foo (double loadavg[], int count) +{ + for (int i = 0; i < count; i++) + loadavg[i] = loads[i] / 1.5; +}