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Generate SSA code from returns (#5172)

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Modify return pseudo-instructions to have pairs of registers: virtual and real. This allows us to constrain the virtual registers to the real ones specified by the abi, instead of directly emitting moves to those real registers.
This commit is contained in:
Trevor Elliott
2022-11-08 16:00:49 -08:00
committed by GitHub
parent d59caf39b6
commit b077854b57
171 changed files with 6368 additions and 6364 deletions
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38
cranelift/codegen/src/isa/s390x/inst/mod.rs
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@@ -1009,17 +1009,17 @@ fn s390x_get_operands<F: Fn(VReg) -> VReg>(inst: &Inst, collector: &mut OperandC
collector.reg_use(rn);
}
&Inst::Call { link, ref info } => {
collector.reg_def(link);
for u in &info.uses {
collector.reg_fixed_use(u.vreg, u.preg);
}
for d in &info.defs {
collector.reg_fixed_def(d.vreg, d.preg);
}
collector.reg_clobbers(info.clobbers);
let mut clobbers = info.clobbers.clone();
clobbers.add(link.to_reg().to_real_reg().unwrap().into());
collector.reg_clobbers(clobbers);
}
&Inst::CallInd { link, ref info } => {
collector.reg_def(link);
collector.reg_use(info.rn);
for u in &info.uses {
collector.reg_fixed_use(u.vreg, u.preg);
@@ -1027,16 +1027,21 @@ fn s390x_get_operands<F: Fn(VReg) -> VReg>(inst: &Inst, collector: &mut OperandC
for d in &info.defs {
collector.reg_fixed_def(d.vreg, d.preg);
}
collector.reg_clobbers(info.clobbers);
let mut clobbers = info.clobbers.clone();
clobbers.add(link.to_reg().to_real_reg().unwrap().into());
collector.reg_clobbers(clobbers);
}
&Inst::Args { ref args } => {
for arg in args {
collector.reg_fixed_def(arg.vreg, arg.preg);
}
}
&Inst::Ret { link, ref rets } => {
collector.reg_use(link);
collector.reg_uses(&rets[..]);
&Inst::Ret { ref rets, .. } => {
// NOTE: we explicitly don't mark the link register as used here, as the use is only in
// the epilog where callee-save registers are restored.
for ret in rets {
collector.reg_fixed_use(ret.vreg, ret.preg);
}
}
&Inst::Jump { .. } => {}
&Inst::IndirectBr { rn, .. } => {
@@ -3231,7 +3236,7 @@ impl Inst {
format!("{} {}, {}", op, rd, rn)
}
&Inst::Call { link, ref info, .. } => {
let link = pretty_print_reg(link.to_reg(), allocs);
let link = link.to_reg();
let tls_symbol = match &info.tls_symbol {
None => "".to_string(),
Some(SymbolReloc::TlsGd { name }) => {
@@ -3239,12 +3244,19 @@ impl Inst {
}
_ => unreachable!(),
};
format!("brasl {}, {}{}", link, info.dest.display(None), tls_symbol)
debug_assert_eq!(link, gpr(14));
format!(
"brasl {}, {}{}",
show_reg(link),
info.dest.display(None),
tls_symbol
)
}
&Inst::CallInd { link, ref info, .. } => {
let link = pretty_print_reg(link.to_reg(), allocs);
let link = link.to_reg();
let rn = pretty_print_reg(info.rn, allocs);
format!("basr {}, {}", link, rn)
debug_assert_eq!(link, gpr(14));
format!("basr {}, {}", show_reg(link), rn)
}
&Inst::Args { ref args } => {
let mut s = "args".to_string();
@@ -3257,8 +3269,8 @@ impl Inst {
s
}
&Inst::Ret { link, .. } => {
let link = pretty_print_reg(link, allocs);
format!("br {}", link)
debug_assert_eq!(link, gpr(14));
format!("br {}", show_reg(link))
}
&Inst::Jump { dest } => {
let dest = dest.to_string();