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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/lower/testdata/array/function_param.carbon
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+1 -4
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@@ -30,8 +30,5 @@ fn G() -> i32 {
// CHECK:STDOUT: %array.index2 = getelementptr inbounds [3 x i32], ptr %temp, i32 0, i32 2
// CHECK:STDOUT: store i32 3, ptr %array.index2, align 4
// CHECK:STDOUT: %F = call i32 @F(ptr %temp, i32 1)
// CHECK:STDOUT: %temp3 = alloca i32, align 4
// CHECK:STDOUT: store i32 %F, ptr %temp3, align 4
// CHECK:STDOUT: %1 = load i32, ptr %temp3, align 4
// CHECK:STDOUT: ret i32 %1
// CHECK:STDOUT: ret i32 %F
// CHECK:STDOUT: }