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ARM64 backend, part 8 / 11: integration.

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This patch ties together the new backend infrastructure with the
existing Cranelift codegen APIs.

With all patches in this series up to this patch applied, the ARM64
compiler is now functional and can be used. Two uses of this
functionality -- filecheck-based tests and integration into wasmtime --
will come in subsequent patches.
This commit is contained in:
Chris Fallin
2020-04-09 13:38:58 -07:00
parent a0e629ecfb
commit 60990aeaae
7 changed files with 209 additions and 64 deletions
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17
cranelift/codegen/src/postopt.rs
View File

@@ -360,6 +360,7 @@ fn optimize_complex_addresses(pos: &mut EncCursor, inst: Inst, isa: &dyn TargetI
pub fn do_postopt(func: &mut Function, isa: &dyn TargetIsa) {
let _tt = timing::postopt();
let mut pos = EncCursor::new(func, isa);
let is_mach_backend = isa.get_mach_backend().is_some();
while let Some(_block) = pos.next_block() {
let mut last_flags_clobber = None;
while let Some(inst) = pos.next_inst() {
@@ -367,13 +368,15 @@ pub fn do_postopt(func: &mut Function, isa: &dyn TargetIsa) {
// Optimize instructions to make use of flags.
optimize_cpu_flags(&mut pos, inst, last_flags_clobber, isa);
// Track the most recent seen instruction that clobbers the flags.
if let Some(constraints) = isa
.encoding_info()
.operand_constraints(pos.func.encodings[inst])
{
if constraints.clobbers_flags {
last_flags_clobber = Some(inst)
if !is_mach_backend {
// Track the most recent seen instruction that clobbers the flags.
if let Some(constraints) = isa
.encoding_info()
.operand_constraints(pos.func.encodings[inst])
{
if constraints.clobbers_flags {
last_flags_clobber = Some(inst)
}
}
}
}