mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 13:51:05 +01:00
Richard Smith
3776c068de
Factor out `SemIR::InstNamer` and also use it when lowering to LLVM IR. Automatically name all instructions created with our `IRBuilder` based on the name computed by the `InstNamer`, and likewise name basic blocks using the label generated by the `InstNamer`. Move some of the existing naming logic out from lower into `InstNamer` so that it's also used in SemIR. In particular, we now name call instructions after their callee, or after the builtin name for calls to builtins. Computing and adding these names isn't completely free. This instruction naming is designed to be optional, so that we can turn it off for builds where the LLVM IR will only be converted to assembly and won't be seen by a human, but so far it's enabled unconditionally. We can tune that later as needed.
69 lines
2.5 KiB
Plaintext
69 lines
2.5 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// AUTOUPDATE
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fn Cond() -> bool;
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fn F();
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fn G();
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// TODO: It would be better to preserve the loop preheader blocks from SemIR
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// into LLVM IR. If we don't, LLVM will recreate them for us as part of loop
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// canonicalization.
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fn While() {
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while (Cond()) {
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F();
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}
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if (Cond()) {
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while (Cond()) {
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G();
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}
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}
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}
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// CHECK:STDOUT: ; ModuleID = 'preheader.carbon'
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// CHECK:STDOUT: source_filename = "preheader.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare i1 @Cond()
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare void @F()
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare void @G()
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @While() {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: br label %while.cond.loc16
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.cond.loc16: ; preds = %entry, %while.body.loc16
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// CHECK:STDOUT: %Cond.call.loc16 = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond.call.loc16, label %while.body.loc16, label %while.done.loc16
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.body.loc16: ; preds = %while.cond.loc16
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// CHECK:STDOUT: call void @F()
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// CHECK:STDOUT: br label %while.cond.loc16
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.done.loc16: ; preds = %while.cond.loc16
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// CHECK:STDOUT: %Cond.call.loc20 = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond.call.loc20, label %while.cond.loc21, label %if.else
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.cond.loc21: ; preds = %while.body.loc21, %while.done.loc16
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// CHECK:STDOUT: %Cond.call.loc21 = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond.call.loc21, label %while.body.loc21, label %while.done.loc21
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.body.loc21: ; preds = %while.cond.loc21
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// CHECK:STDOUT: call void @G()
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// CHECK:STDOUT: br label %while.cond.loc21
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// CHECK:STDOUT:
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// CHECK:STDOUT: while.done.loc21: ; preds = %while.cond.loc21
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// CHECK:STDOUT: br label %if.else
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// CHECK:STDOUT:
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// CHECK:STDOUT: if.else: ; preds = %while.done.loc21, %while.done.loc16
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// CHECK:STDOUT: ret void
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder label %while.cond.loc16, { 1, 0 }
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// CHECK:STDOUT: }
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