From c2fd26a115645c92537719b1a04270e1ba727cbf Mon Sep 17 00:00:00 2001 From: Nikita Popov Date: Fri, 15 Dec 2023 12:14:39 +0100 Subject: Separate immediate and in-memory ScalarPair representation Currently, we assume that ScalarPair is always represented using a two-element struct, both as an immediate value and when stored in memory. This currently works fairly well, but runs into problems with https://github.com/rust-lang/rust/pull/116672, where a ScalarPair involving an i128 type can no longer be represented as a two-element struct in memory. For example, the tuple `(i32, i128)` needs to be represented in-memory as `{ i32, [3 x i32], i128 }` to satisfy alignment requirement. Using `{ i32, i128 }` instead will result in the second element being stored at the wrong offset (prior to LLVM 18). Resolve this issue by no longer requiring that the immediate and in-memory type for ScalarPair are the same. The in-memory type will now look the same as for normal struct types (and will include padding filler and similar), while the immediate type stays a simple two-element struct type. This also means that booleans in immediate ScalarPair are now represented as i1 rather than i8, just like we do everywhere else. The core change here is to llvm_type (which now treats ScalarPair as a normal struct) and immediate_llvm_type (which returns the two-element struct that llvm_type used to produce). The rest is fixing things up to no longer assume these are the same. In particular, this switches places that try to get pointers to the ScalarPair elements to use byte-geps instead of struct-geps. --- tests/codegen/function-arguments.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'tests/codegen/function-arguments.rs') diff --git a/tests/codegen/function-arguments.rs b/tests/codegen/function-arguments.rs index a218596da1d..64ebd3c05af 100644 --- a/tests/codegen/function-arguments.rs +++ b/tests/codegen/function-arguments.rs @@ -275,7 +275,7 @@ pub fn enum_id_1(x: Option>) -> Option> { x } -// CHECK: { i8, i8 } @enum_id_2(i1 noundef zeroext %x.0, i8 %x.1) +// CHECK: { i1, i8 } @enum_id_2(i1 noundef zeroext %x.0, i8 %x.1) #[no_mangle] pub fn enum_id_2(x: Option) -> Option { x -- cgit 1.4.1-3-g733a5