009280c5e3
When passing a 16 (or higher) aligned struct by value on ppc64le, it needs to be passed as an array of `i128` rather than an array of `i64`. This will force the use of an even starting register. For the case of a 16 byte struct with alignment 16 it is important that `[1 x i128]` is used instead of `i128` -- apparently, the latter will get treated similarly to `[2 x i64]`, not exhibiting the correct ABI. Add a `force_array` flag to `Uniform` to support this. The relevant clang code can be found here:fe2119a7b0/clang/lib/CodeGen/Targets/PPC.cpp (L878-L884)fe2119a7b0/clang/lib/CodeGen/Targets/PPC.cpp (L780-L784)I think the corresponding psABI wording is this: > Fixed size aggregates and unions passed by value are mapped to as > many doublewords of the parameter save area as the value uses in > memory. Aggregrates and unions are aligned according to their > alignment requirements. This may result in doublewords being > skipped for alignment. In particular the last sentence. Fixes https://github.com/rust-lang/rust/issues/122767.
94 lines
1.7 KiB
Rust
94 lines
1.7 KiB
Rust
// Test that structs aligned to 128 bits are passed with the correct ABI on powerpc64le.
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// This is similar to aarch64-struct-align-128.rs, but for ppc.
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//@ compile-flags: --target powerpc64le-unknown-linux-gnu
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//@ needs-llvm-components: powerpc
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#![feature(no_core, lang_items)]
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#![crate_type = "lib"]
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#![no_core]
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#[lang="sized"]
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trait Sized { }
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#[lang="freeze"]
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trait Freeze { }
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#[lang="copy"]
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trait Copy { }
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#[repr(C)]
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pub struct Align8 {
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pub a: u64,
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pub b: u64,
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}
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#[repr(transparent)]
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pub struct Transparent8 {
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a: Align8
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}
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#[repr(C)]
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pub struct Wrapped8 {
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a: Align8,
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}
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extern "C" {
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// CHECK: declare void @test_8([2 x i64], [2 x i64], [2 x i64])
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fn test_8(a: Align8, b: Transparent8, c: Wrapped8);
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}
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#[repr(C)]
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#[repr(align(16))]
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pub struct Align16 {
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pub a: u64,
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pub b: u64,
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}
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#[repr(transparent)]
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pub struct Transparent16 {
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a: Align16
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}
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#[repr(C)]
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pub struct Wrapped16 {
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pub a: Align16,
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}
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extern "C" {
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// It's important that this produces [1 x i128] rather than just i128!
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// CHECK: declare void @test_16([1 x i128], [1 x i128], [1 x i128])
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fn test_16(a: Align16, b: Transparent16, c: Wrapped16);
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}
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#[repr(C)]
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#[repr(align(32))]
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pub struct Align32 {
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pub a: u64,
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pub b: u64,
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pub c: u64,
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}
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#[repr(transparent)]
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pub struct Transparent32 {
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a: Align32
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}
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#[repr(C)]
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pub struct Wrapped32 {
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pub a: Align32,
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}
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extern "C" {
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// CHECK: declare void @test_32([2 x i128], [2 x i128], [2 x i128])
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fn test_32(a: Align32, b: Transparent32, c: Wrapped32);
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}
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pub unsafe fn main(
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a1: Align8, a2: Transparent8, a3: Wrapped8,
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b1: Align16, b2: Transparent16, b3: Wrapped16,
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c1: Align32, c2: Transparent32, c3: Wrapped32,
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) {
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test_8(a1, a2, a3);
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test_16(b1, b2, b3);
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test_32(c1, c2, c3);
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}
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