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Implement initial emission of constants

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This approach suffers from memory-size bloat during compile time due to the desire to de-duplicate the constants emitted and reduce runtime memory-size. As a first step, though, this provides an end-to-end mechanism for constants to be emitted in the MachBuffer islands.
This commit is contained in:
Andrew Brown
2020-10-27 11:54:15 -07:00
parent efa87d4c17
commit 83f182b390
7 changed files with 251 additions and 64 deletions
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23
cranelift/codegen/src/isa/x64/inst/emit.rs
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@@ -1979,29 +1979,10 @@ pub(crate) fn emit(
sink.put1(*imm);
}
Inst::XmmLoadConstSeq { val, dst, ty } => {
// This sequence is *one* instruction in the vcode, and is expanded only here at
// emission time, because we cannot allow the regalloc to insert spills/reloads in
// the middle; we depend on hardcoded PC-rel addressing below. TODO Eventually this
// "constant inline" code should be replaced by constant pool integration.
// Load the inline constant.
let constant_start_label = sink.get_label();
let load_offset = Amode::rip_relative(constant_start_label);
Inst::XmmLoadConst { src, dst, ty } => {
let load_offset = Amode::rip_relative(sink.get_label_for_constant(*src));
let load = Inst::load(*ty, load_offset, *dst, ExtKind::None, None);
load.emit(sink, info, state);
// Jump over the constant.
let constant_end_label = sink.get_label();
let jump = Inst::jmp_known(constant_end_label);
jump.emit(sink, info, state);
// Emit the constant.
sink.bind_label(constant_start_label);
for i in val.iter() {
sink.put1(*i);
}
sink.bind_label(constant_end_label);
}
Inst::XmmUninitializedValue { .. } => {