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Fix a few comment typos and add a clarifying comment.

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This commit is contained in:
Chris Fallin
2021-01-21 16:01:46 -08:00
parent 997fab55d5
commit 7e12abce71
1 changed files with 4 additions and 2 deletions
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6
cranelift/codegen/src/machinst/debug.rs
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@@ -13,7 +13,7 @@
//! We track, at every program point, the correspondence between each value //! We track, at every program point, the correspondence between each value
//! label and *all* locations in which it resides. E.g., if it is stored to the //! label and *all* locations in which it resides. E.g., if it is stored to the
//! stack, we remember that it is in both a register and the stack slot; but if //! stack, we remember that it is in both a register and the stack slot; but if
//! the register is later overridden, then we have it just in the stack slot. //! the register is later overwritten, then we have it just in the stack slot.
//! This allows us to avoid false-positives observing loads/stores that we think //! This allows us to avoid false-positives observing loads/stores that we think
//! are spillslots but really aren't. //! are spillslots but really aren't.
//! //!
@@ -320,7 +320,7 @@ pub(crate) fn compute<I: VCodeInst>(
// Initialize state at entry. // Initialize state at entry.
block_starts.insert(0, AnalysisInfo::new()); block_starts.insert(0, AnalysisInfo::new());
// Worklist: basic-block start offset. // Worklist: label indices for basic blocks.
let mut worklist = VecDeque::new(); let mut worklist = VecDeque::new();
let mut worklist_set = HashSet::new(); let mut worklist_set = HashSet::new();
worklist.push_back(0); worklist.push_back(0);
@@ -332,6 +332,8 @@ pub(crate) fn compute<I: VCodeInst>(
let mut state = block_starts.get(&block).unwrap().clone(); let mut state = block_starts.get(&block).unwrap().clone();
trace!("at block {} -> state: {:?}", block, state); trace!("at block {} -> state: {:?}", block, state);
// Iterate for each instruction in the block (we break at the first
// terminator we see).
let mut iix = label_insn_iix[block as usize]; let mut iix = label_insn_iix[block as usize];
while iix < insts.len() as u32 { while iix < insts.len() as u32 {
state.step(&insts[iix as usize]); state.step(&insts[iix as usize]);