mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-01 22:02:45 +01:00
Richard Smith
6e9d83e746
Basic support for type-checking and lowering of `while` statements, as well as `break` and `continue`.
78 lines
2.6 KiB
Plaintext
78 lines
2.6 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 %0
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// CHECK:STDOUT:
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// CHECK:STDOUT: 0: ; preds = %entry, %2
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// CHECK:STDOUT: %Cond = call i1 @Cond()
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// CHECK:STDOUT: %temp = alloca i1, align 1
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// CHECK:STDOUT: store i1 %Cond, ptr %temp, align 1
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// CHECK:STDOUT: %1 = load i1, ptr %temp, align 1
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// CHECK:STDOUT: br i1 %1, label %2, label %3
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// CHECK:STDOUT:
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// CHECK:STDOUT: 2: ; preds = %0
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// CHECK:STDOUT: call void @F()
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// CHECK:STDOUT: br label %0
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// CHECK:STDOUT:
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// CHECK:STDOUT: 3: ; preds = %0
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// CHECK:STDOUT: %Cond1 = call i1 @Cond()
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// CHECK:STDOUT: %temp2 = alloca i1, align 1
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// CHECK:STDOUT: store i1 %Cond1, ptr %temp2, align 1
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// CHECK:STDOUT: %4 = load i1, ptr %temp2, align 1
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// CHECK:STDOUT: br i1 %4, label %5, label %9
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// CHECK:STDOUT:
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// CHECK:STDOUT: 5: ; preds = %7, %3
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// CHECK:STDOUT: %Cond3 = call i1 @Cond()
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// CHECK:STDOUT: %temp4 = alloca i1, align 1
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// CHECK:STDOUT: store i1 %Cond3, ptr %temp4, align 1
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// CHECK:STDOUT: %6 = load i1, ptr %temp4, align 1
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// CHECK:STDOUT: br i1 %6, label %7, label %8
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// CHECK:STDOUT:
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// CHECK:STDOUT: 7: ; preds = %5
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// CHECK:STDOUT: call void @G()
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// CHECK:STDOUT: br label %5
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// CHECK:STDOUT:
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// CHECK:STDOUT: 8: ; preds = %5
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// CHECK:STDOUT: br label %9
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// CHECK:STDOUT:
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// CHECK:STDOUT: 9: ; preds = %8, %3
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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 %0, { 1, 0 }
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// CHECK:STDOUT: }
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