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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +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.
57 lines
2.7 KiB
Plaintext
57 lines
2.7 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 F(arr: [i32; 3], i: i32) -> i32 {
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return arr[i];
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}
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fn G() -> i32 {
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return F((1, 2, 3), 1);
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}
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// CHECK:STDOUT: file "function_param.carbon" {
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// CHECK:STDOUT: %F: <function> = fn_decl @F
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// CHECK:STDOUT: %G: <function> = fn_decl @G
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F(%arr: [i32; 3], %i: i32) -> i32 {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %.loc7: type = ptr_type [i32; 3]
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// CHECK:STDOUT: %arr.ref: [i32; 3] = name_reference "arr", %arr
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// CHECK:STDOUT: %i.ref: i32 = name_reference "i", %i
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// CHECK:STDOUT: %.loc8_15.1: ref [i32; 3] = value_as_reference %arr.ref
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// CHECK:STDOUT: %.loc8_15.2: ref i32 = array_index %.loc8_15.1, %i.ref
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// CHECK:STDOUT: %.loc8_15.3: i32 = bind_value %.loc8_15.2
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// CHECK:STDOUT: return %.loc8_15.3
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @G() -> i32 {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %F.ref: <function> = name_reference "F", file.%F
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// CHECK:STDOUT: %.loc12_13: i32 = int_literal 1
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// CHECK:STDOUT: %.loc12_16: i32 = int_literal 2
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// CHECK:STDOUT: %.loc12_19: i32 = int_literal 3
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// CHECK:STDOUT: %.loc12_20.1: type = tuple_type (i32, i32, i32)
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// CHECK:STDOUT: %.loc12_20.2: (i32, i32, i32) = tuple_literal (%.loc12_13, %.loc12_16, %.loc12_19)
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// CHECK:STDOUT: %.loc12_23: i32 = int_literal 1
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// CHECK:STDOUT: %.loc12_20.3: ref [i32; 3] = temporary_storage
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// CHECK:STDOUT: %.loc12_20.4: i32 = int_literal 0
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// CHECK:STDOUT: %.loc12_20.5: ref i32 = array_index %.loc12_20.3, %.loc12_20.4
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// CHECK:STDOUT: %.loc12_20.6: init i32 = initialize_from %.loc12_13 to %.loc12_20.5
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// CHECK:STDOUT: %.loc12_20.7: i32 = int_literal 1
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// CHECK:STDOUT: %.loc12_20.8: ref i32 = array_index %.loc12_20.3, %.loc12_20.7
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// CHECK:STDOUT: %.loc12_20.9: init i32 = initialize_from %.loc12_16 to %.loc12_20.8
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// CHECK:STDOUT: %.loc12_20.10: i32 = int_literal 2
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// CHECK:STDOUT: %.loc12_20.11: ref i32 = array_index %.loc12_20.3, %.loc12_20.10
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// CHECK:STDOUT: %.loc12_20.12: init i32 = initialize_from %.loc12_19 to %.loc12_20.11
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// CHECK:STDOUT: %.loc12_20.13: init [i32; 3] = array_init %.loc12_20.2, (%.loc12_20.6, %.loc12_20.9, %.loc12_20.12) to %.loc12_20.3
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// CHECK:STDOUT: %.loc12_20.14: ref [i32; 3] = temporary %.loc12_20.3, %.loc12_20.13
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// CHECK:STDOUT: %.loc12_20.15: [i32; 3] = bind_value %.loc12_20.14
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// CHECK:STDOUT: %.loc12_11: init i32 = call %F.ref(%.loc12_20.15, %.loc12_23)
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// CHECK:STDOUT: %.loc12_25: i32 = value_of_initializer %.loc12_11
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// CHECK:STDOUT: return %.loc12_25
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// CHECK:STDOUT: }
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