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Don't try to infer where to put loads in lowering. (#3146)

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Trust semantics to have put them in the right places.

Many parts of lowering still need to be updated to use the value
representation chosen at the semantics layer, but this is an incremental
step towards that.
This commit is contained in:
Richard Smith
2023-10-04 19:57:12 +00:00
committed by GitHub
parent 6833652ffa
commit 1ac7002bf6
15 changed files with 325 additions and 92 deletions
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toolchain/lower/testdata/pointer/pointer_to_pointer.carbon
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
fn F(p: i32**) -> i32 {
var a: i32** = p;
var b: i32* = *p;
var c: i32** = &b;
return **c;
}
// CHECK:STDOUT: ; ModuleID = 'pointer_to_pointer.carbon'
// CHECK:STDOUT: source_filename = "pointer_to_pointer.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @F(ptr %p) {
// CHECK:STDOUT: %a = alloca ptr, align 8
// CHECK:STDOUT: store ptr %p, ptr %a, align 8
// CHECK:STDOUT: %b = alloca ptr, align 8
// CHECK:STDOUT: %1 = load ptr, ptr %p, align 8
// CHECK:STDOUT: store ptr %1, ptr %b, align 8
// CHECK:STDOUT: %c = alloca ptr, align 8
// CHECK:STDOUT: store ptr %b, ptr %c, align 8
// CHECK:STDOUT: %2 = load ptr, ptr %c, align 8
// CHECK:STDOUT: %3 = load ptr, ptr %2, align 8
// CHECK:STDOUT: %4 = load i32, ptr %3, align 4
// CHECK:STDOUT: ret i32 %4
// CHECK:STDOUT: }