forked from M-Labs/nac3
artiq: Improve IR value naming and add documentation
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8373a6cb0f
commit
65d6104d00
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@ -28,9 +28,17 @@ use std::{
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pub struct ArtiqCodeGenerator<'a> {
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name: String,
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/// The size of a `size_t` variable in bits.
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size_t: u32,
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/// Monotonic counter for naming `start`/`stop` variables used by `with parallel` blocks.
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name_counter: u32,
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/// Variable for tracking the start of a `with parallel` block.
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start: Option<Expr<Option<Type>>>,
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/// Variable for tracking the end of a `with parallel` block.
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end: Option<Expr<Option<Type>>>,
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timeline: &'a (dyn TimeFns + Sync),
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}
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@ -102,6 +110,7 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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if let StmtKind::With { items, body, .. } = &stmt.node {
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if items.len() == 1 && items[0].optional_vars.is_none() {
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let item = &items[0];
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// Behavior of parallel and sequential:
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// Each function call (indirectly, can be inside a sequential block) within a parallel
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// block will update the end variable to the maximum now_mu in the block.
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@ -119,11 +128,15 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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if id == &"parallel".into() {
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let old_start = self.start.take();
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let old_end = self.end.take();
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let now = if let Some(old_start) = &old_start {
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self.gen_expr(ctx, old_start)?.unwrap().to_basic_value_enum(ctx, self, old_start.custom.unwrap())?
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self.gen_expr(ctx, old_start)?
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.unwrap()
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.to_basic_value_enum(ctx, self, old_start.custom.unwrap())?
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} else {
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self.timeline.emit_now_mu(ctx)
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};
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// Emulate variable allocation, as we need to use the CodeGenContext
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// HashMap to store our variable due to lifetime limitation
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// Note: we should be able to store variables directly if generic
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@ -157,8 +170,11 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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ctx.builder.build_store(end, now);
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self.end = Some(end_expr);
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self.name_counter += 1;
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gen_block(self, ctx, body.iter())?;
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let current = ctx.builder.get_insert_block().unwrap();
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// if the current block is terminated, move before the terminator
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// we want to set the timeline before reaching the terminator
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// TODO: This may be unsound if there are multiple exit paths in the
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@ -172,6 +188,7 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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} else {
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false
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};
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// set duration
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let end_expr = self.end.take().unwrap();
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let end_val = self
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@ -183,6 +200,7 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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if old_start.is_none() {
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self.timeline.emit_at_mu(ctx, end_val);
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}
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// inside a parallel block, should update the outer max now_mu
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if let Some(old_end) = &old_end {
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let outer_end_val = self
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@ -207,20 +225,25 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
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let outer_end = self.gen_store_target(ctx, old_end, Some("outer_end.addr"))?;
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ctx.builder.build_store(outer_end, max);
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}
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self.start = old_start;
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self.end = old_end;
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if reset_position {
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ctx.builder.position_at_end(current);
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}
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return Ok(());
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} else if id == &"sequential".into() {
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let start = self.start.take();
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gen_block(self, ctx, body.iter())?;
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self.start = start;
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return Ok(());
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}
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}
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}
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// not parallel/sequential
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gen_with(self, ctx, stmt)
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} else {
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@ -1,9 +1,16 @@
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use inkwell::{values::BasicValueEnum, AddressSpace, AtomicOrdering};
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use nac3core::codegen::CodeGenContext;
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/// Functions for manipulating the timeline.
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pub trait TimeFns {
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/// Emits LLVM IR for `now_mu`.
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fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx>;
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/// Emits LLVM IR for `at_mu`.
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fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>);
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/// Emits LLVM IR for `delay_mu`.
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fn emit_delay_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, dt: BasicValueEnum<'ctx>);
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}
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@ -20,23 +27,25 @@ impl TimeFns for NowPinningTimeFns64 {
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.get_global("now")
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.unwrap_or_else(|| ctx.module.add_global(i64_type, None, "now"));
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let now_hiptr =
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ctx.builder.build_bitcast(now, i32_type.ptr_type(AddressSpace::default()), "now_hiptr");
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ctx.builder.build_bitcast(now, i32_type.ptr_type(AddressSpace::default()), "now.hi.addr");
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if let BasicValueEnum::PointerValue(now_hiptr) = now_hiptr {
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let now_loptr = unsafe {
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now_gep")
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now.lo.addr")
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};
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if let (BasicValueEnum::IntValue(now_hi), BasicValueEnum::IntValue(now_lo)) = (
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ctx.builder.build_load(now_hiptr, "now_hi"),
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ctx.builder.build_load(now_loptr, "now_lo"),
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ctx.builder.build_load(now_hiptr, "now.hi"),
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ctx.builder.build_load(now_loptr, "now.lo"),
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) {
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let zext_hi = ctx.builder.build_int_z_extend(now_hi, i64_type, "now_zext_hi");
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let zext_hi = ctx.builder.build_int_z_extend(now_hi, i64_type, "");
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let shifted_hi = ctx.builder.build_left_shift(
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zext_hi,
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i64_type.const_int(32, false),
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"now_shifted_zext_hi",
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"",
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);
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let zext_lo = ctx.builder.build_int_z_extend(now_lo, i64_type, "now_zext_lo");
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ctx.builder.build_or(shifted_hi, zext_lo, "now_or").into()
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let zext_lo = ctx.builder.build_int_z_extend(now_lo, i64_type, "");
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ctx.builder.build_or(shifted_hi, zext_lo, "now_mu").into()
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} else {
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unreachable!();
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}
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@ -48,14 +57,15 @@ impl TimeFns for NowPinningTimeFns64 {
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fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>) {
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let i32_type = ctx.ctx.i32_type();
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let i64_type = ctx.ctx.i64_type();
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let i64_32 = i64_type.const_int(32, false);
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if let BasicValueEnum::IntValue(time) = t {
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let time_hi = ctx.builder.build_int_truncate(
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ctx.builder.build_right_shift(time, i64_32, false, "now_lshr"),
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ctx.builder.build_right_shift(time, i64_32, false, "time.hi"),
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i32_type,
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"now_trunc",
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"",
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);
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "now_trunc");
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "time.lo");
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let now = ctx
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.module
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.get_global("now")
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@ -63,11 +73,12 @@ impl TimeFns for NowPinningTimeFns64 {
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let now_hiptr = ctx.builder.build_bitcast(
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now,
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i32_type.ptr_type(AddressSpace::default()),
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"now_bitcast",
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"now.hi.addr",
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);
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if let BasicValueEnum::PointerValue(now_hiptr) = now_hiptr {
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let now_loptr = unsafe {
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now_gep")
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now.lo.addr")
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};
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ctx.builder
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.build_store(now_hiptr, time_hi)
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@ -97,41 +108,43 @@ impl TimeFns for NowPinningTimeFns64 {
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.get_global("now")
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.unwrap_or_else(|| ctx.module.add_global(i64_type, None, "now"));
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let now_hiptr =
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ctx.builder.build_bitcast(now, i32_type.ptr_type(AddressSpace::default()), "now_hiptr");
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ctx.builder.build_bitcast(now, i32_type.ptr_type(AddressSpace::default()), "now.hi.addr");
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if let BasicValueEnum::PointerValue(now_hiptr) = now_hiptr {
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let now_loptr = unsafe {
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now_loptr")
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(2, false)], "now.lo.addr")
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};
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if let (
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BasicValueEnum::IntValue(now_hi),
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BasicValueEnum::IntValue(now_lo),
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BasicValueEnum::IntValue(dt),
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) = (
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ctx.builder.build_load(now_hiptr, "now_hi"),
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ctx.builder.build_load(now_loptr, "now_lo"),
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ctx.builder.build_load(now_hiptr, "now.hi"),
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ctx.builder.build_load(now_loptr, "now.lo"),
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dt,
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) {
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let zext_hi = ctx.builder.build_int_z_extend(now_hi, i64_type, "now_zext_hi");
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let zext_hi = ctx.builder.build_int_z_extend(now_hi, i64_type, "");
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let shifted_hi = ctx.builder.build_left_shift(
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zext_hi,
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i64_type.const_int(32, false),
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"now_shifted_zext_hi",
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"",
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);
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let zext_lo = ctx.builder.build_int_z_extend(now_lo, i64_type, "now_zext_lo");
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let now_val = ctx.builder.build_or(shifted_hi, zext_lo, "now_or");
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let zext_lo = ctx.builder.build_int_z_extend(now_lo, i64_type, "");
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let now_val = ctx.builder.build_or(shifted_hi, zext_lo, "now");
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let time = ctx.builder.build_int_add(now_val, dt, "now_add");
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let time = ctx.builder.build_int_add(now_val, dt, "time");
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let time_hi = ctx.builder.build_int_truncate(
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ctx.builder.build_right_shift(
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time,
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i64_type.const_int(32, false),
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false,
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"now_lshr",
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"",
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),
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i32_type,
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"now_trunc",
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"time.hi",
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);
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "now_trunc");
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "time.lo");
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ctx.builder
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.build_store(now_hiptr, time_hi)
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@ -162,11 +175,12 @@ impl TimeFns for NowPinningTimeFns {
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.get_global("now")
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.unwrap_or_else(|| ctx.module.add_global(i64_type, None, "now"));
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let now_raw = ctx.builder.build_load(now.as_pointer_value(), "now");
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if let BasicValueEnum::IntValue(now_raw) = now_raw {
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let i64_32 = i64_type.const_int(32, false);
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let now_lo = ctx.builder.build_left_shift(now_raw, i64_32, "now_shl");
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let now_hi = ctx.builder.build_right_shift(now_raw, i64_32, false, "now_lshr");
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ctx.builder.build_or(now_lo, now_hi, "now_or").into()
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let now_lo = ctx.builder.build_left_shift(now_raw, i64_32, "now.lo");
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let now_hi = ctx.builder.build_right_shift(now_raw, i64_32, false, "now.hi");
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ctx.builder.build_or(now_lo, now_hi, "now_mu").into()
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} else {
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unreachable!();
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}
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@ -176,11 +190,12 @@ impl TimeFns for NowPinningTimeFns {
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let i32_type = ctx.ctx.i32_type();
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let i64_type = ctx.ctx.i64_type();
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let i64_32 = i64_type.const_int(32, false);
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if let BasicValueEnum::IntValue(time) = t {
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let time_hi = ctx.builder.build_int_truncate(
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ctx.builder.build_right_shift(time, i64_32, false, "now_lshr"),
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ctx.builder.build_right_shift(time, i64_32, false, ""),
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i32_type,
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"now_trunc",
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"time.hi",
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);
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "now_trunc");
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let now = ctx
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@ -190,11 +205,12 @@ impl TimeFns for NowPinningTimeFns {
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let now_hiptr = ctx.builder.build_bitcast(
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now,
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i32_type.ptr_type(AddressSpace::default()),
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"now_bitcast",
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"now.hi.addr",
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);
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if let BasicValueEnum::PointerValue(now_hiptr) = now_hiptr {
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let now_loptr = unsafe {
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(1, false)], "now_gep")
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(1, false)], "now.lo.addr")
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};
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ctx.builder
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.build_store(now_hiptr, time_hi)
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@ -224,26 +240,28 @@ impl TimeFns for NowPinningTimeFns {
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.module
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.get_global("now")
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.unwrap_or_else(|| ctx.module.add_global(i64_type, None, "now"));
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let now_raw = ctx.builder.build_load(now.as_pointer_value(), "now");
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let now_raw = ctx.builder.build_load(now.as_pointer_value(), "");
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if let (BasicValueEnum::IntValue(now_raw), BasicValueEnum::IntValue(dt)) = (now_raw, dt) {
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let now_lo = ctx.builder.build_left_shift(now_raw, i64_32, "now_shl");
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let now_hi = ctx.builder.build_right_shift(now_raw, i64_32, false, "now_lshr");
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let now_val = ctx.builder.build_or(now_lo, now_hi, "now_or");
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let time = ctx.builder.build_int_add(now_val, dt, "now_add");
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let now_lo = ctx.builder.build_left_shift(now_raw, i64_32, "now.lo");
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let now_hi = ctx.builder.build_right_shift(now_raw, i64_32, false, "now.hi");
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let now_val = ctx.builder.build_or(now_lo, now_hi, "now_val");
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let time = ctx.builder.build_int_add(now_val, dt, "time");
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let time_hi = ctx.builder.build_int_truncate(
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ctx.builder.build_right_shift(time, i64_32, false, "now_lshr"),
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ctx.builder.build_right_shift(time, i64_32, false, "time.hi"),
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i32_type,
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"now_trunc",
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);
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "now_trunc");
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let time_lo = ctx.builder.build_int_truncate(time, i32_type, "time.lo");
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let now_hiptr = ctx.builder.build_bitcast(
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now,
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i32_type.ptr_type(AddressSpace::default()),
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"now_bitcast",
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"now.hi.addr",
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);
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if let BasicValueEnum::PointerValue(now_hiptr) = now_hiptr {
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let now_loptr = unsafe {
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(1, false)], "now_gep")
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ctx.builder.build_gep(now_hiptr, &[i32_type.const_int(1, false)], "now.lo.addr")
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};
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ctx.builder
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.build_store(now_hiptr, time_hi)
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