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Use the cute Function::all_inst_iter helper, because it's cute. (#535)

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Ashley Hauck 2021-03-25 11:20:34 +01:00 committed by GitHub
parent dea67c686c
commit 15d96cde8c
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1 changed files with 10 additions and 9 deletions
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19
crates/rustc_codegen_spirv/src/linker/dce.rs
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@ -1,3 +1,12 @@
//! Dead code elimination
//!
//! This pass removes any instruction that doesn't affect the module. It does so by considering all
//! `OpEntryPoint` instructions to be "rooted", and then everything a rooted instruction touches is
//! also rooted (done transitively). Then, any instruction not rooted is removed. It gets a little
//! weird with things like `OpDecorate`, where the reference is reversed - an `OpDecorate` that
//! *references* a rooted thing is also rooted, not the other way around - but that's the basic
//! concept.
use rspirv::dr::{Instruction, Module};
use rspirv::spirv::Word;
use std::collections::HashSet;
@ -27,17 +36,9 @@ fn spread_roots(module: &Module, rooted: &mut HashSet<Word>) -> bool {
}
for func in &module.functions {
if rooted.contains(&func.def_id().unwrap()) {
for inst in &func.def {
for inst in func.all_inst_iter() {
any |= root(inst, rooted);
}
for inst in &func.parameters {
any |= root(inst, rooted);
}
for block in &func.blocks {
for inst in &block.instructions {
any |= root(inst, rooted);
}
}
}
}
any