From f7d90c67c7d564c270afc8ddf66ea1279043e39f Mon Sep 17 00:00:00 2001 From: Caio Marcelo de Oliveira Filho Date: Fri, 23 Aug 2019 07:41:18 -0700 Subject: [PATCH] intel/compiler: Silence maybe-uninitialized warning in GCC 9.1.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Compiler can't see that d is initialized. ../src/intel/compiler/brw_vec4_nir.cpp: In function ‘int brw::try_immediate_source(const nir_alu_instr*, brw::src_reg*, bool, const gen_device_info*)’: ../src/intel/compiler/brw_vec4_nir.cpp:984:12: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] 984 | d = MAX2(-d, d); Assert that we expect at least one component -- hence d going to be set. That by itself is not enough, so also zero initialize the variable. Acked-by: Eric Engestrom Reviewed-by: Jason Ekstrand --- src/intel/compiler/brw_vec4_nir.cpp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/intel/compiler/brw_vec4_nir.cpp b/src/intel/compiler/brw_vec4_nir.cpp index 6301c95..c357ee2 100644 --- a/src/intel/compiler/brw_vec4_nir.cpp +++ b/src/intel/compiler/brw_vec4_nir.cpp @@ -963,7 +963,7 @@ try_immediate_source(const nir_alu_instr *instr, src_reg *op, case BRW_REGISTER_TYPE_D: case BRW_REGISTER_TYPE_UD: { int first_comp = -1; - int d; + int d = 0; for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) { if (nir_alu_instr_channel_used(instr, idx, i)) { @@ -978,6 +978,8 @@ try_immediate_source(const nir_alu_instr *instr, src_reg *op, } } + assert(first_comp >= 0); + if (op[idx].abs) d = MAX2(-d, d); -- 2.7.4