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Emit compressed instruction encodings for instructions where constraints allow

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This commit is contained in:
Angus Holder
2017-09-22 00:40:43 +01:00
committed by Jakob Stoklund Olesen
parent 2d4c860187
commit 3b66c0be40
4 changed files with 80 additions and 4 deletions
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22
cranelift/src/filetest/binemit.rs
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@@ -104,16 +104,32 @@ impl SubTest for TestBinEmit {
// value locations. The current error reporting is just crashing...
let mut func = func.into_owned();
let is_compressed = isa.flags().is_compressed();
// Give an encoding to any instruction that doesn't already have one.
for ebb in func.layout.ebbs() {
for inst in func.layout.ebb_insts(ebb) {
if !func.encodings[inst].is_legal() {
if let Ok(enc) = isa.encode(
let mut legal_encodings = isa.legal_encodings(
&func.dfg,
&func.dfg[inst],
func.dfg.ctrl_typevar(inst),
)
{
);
let enc = if is_compressed {
// Get the smallest legal encoding
legal_encodings
.filter(|e| {
let recipe_constraints = &encinfo.constraints[e.recipe()];
recipe_constraints.satisfied(inst, &func)
})
.min_by_key(|&e| encinfo.bytes(e))
} else {
// If not using compressed, just use the first encoding.
legal_encodings.next()
};
if let Some(enc) = enc {
func.encodings[inst] = enc;
}
}