mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-27 22:02:33 +01:00
Richard Smith
428d11323a
If the initializing representation is the same as the value representation, don't materialize a temporary and perform a value binding. Instead, directly extract the value, using a new `value_of_initializer` node. This removes a lot of redundant `alloca`s from our generated LLVM IR.
69 lines
2.1 KiB
Plaintext
69 lines
2.1 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, %1
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// CHECK:STDOUT: %Cond = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond, label %1, label %2
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// CHECK:STDOUT:
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// CHECK:STDOUT: 1: ; 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: 2: ; preds = %0
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// CHECK:STDOUT: %Cond1 = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond1, label %3, label %6
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// CHECK:STDOUT:
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// CHECK:STDOUT: 3: ; preds = %4, %2
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// CHECK:STDOUT: %Cond2 = call i1 @Cond()
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// CHECK:STDOUT: br i1 %Cond2, label %4, label %5
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// CHECK:STDOUT:
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// CHECK:STDOUT: 4: ; preds = %3
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// CHECK:STDOUT: call void @G()
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// CHECK:STDOUT: br label %3
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// CHECK:STDOUT:
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// CHECK:STDOUT: 5: ; preds = %3
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// CHECK:STDOUT: br label %6
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// CHECK:STDOUT:
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// CHECK:STDOUT: 6: ; preds = %5, %2
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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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