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Directly convert from an initializer to a value where possible. (#3306)

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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.
This commit is contained in:
Richard Smith
2023-10-31 20:59:28 +00:00
committed by GitHub
parent bc8db9406d
commit 428d11323a
32 changed files with 214 additions and 290 deletions
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toolchain/check/testdata/array/function_param.carbon
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+3 -5
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@@ -50,9 +50,7 @@ fn G() -> i32 {
// 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
// CHECK:STDOUT: %.loc12_20.14: ref [i32; 3] = temporary %.loc12_20.3, %.loc12_20.13
// CHECK:STDOUT: %.loc12_20.15: [i32; 3] = bind_value %.loc12_20.14
// CHECK:STDOUT: %.loc12_11.1: init i32 = call %F.ref(%.loc12_20.15, %.loc12_23)
// CHECK:STDOUT: %.loc12_11.2: ref i32 = temporary_storage
// CHECK:STDOUT: %.loc12_11.3: ref i32 = temporary %.loc12_11.2, %.loc12_11.1
// CHECK:STDOUT: %.loc12_11.4: i32 = bind_value %.loc12_11.3
// CHECK:STDOUT: return %.loc12_11.4
// CHECK:STDOUT: %.loc12_11: init i32 = call %F.ref(%.loc12_20.15, %.loc12_23)
// CHECK:STDOUT: %.loc12_25: i32 = value_of_initializer %.loc12_11
// CHECK:STDOUT: return %.loc12_25
// CHECK:STDOUT: }