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645c0fddd2
Previously, it was only put on scalars with range validity invariants like bool, was uninit was obviously invalid for those. Since then, we have normatively declared all uninit primitives to be undefined behavior and can therefore put `noundef` on them. The remaining concern was the `mem::uninitialized` function, which cause quite a lot of UB in the older parts of the ecosystem. This function now doesn't return uninit values anymore, making users of it safe from this change. The only real sources of UB where people could encounter uninit primitives are `MaybeUninit::uninit().assume_init()`, which has always be clear in the docs about being UB and from heap allocations (like reading from the spare capacity of a vec. This is hopefully rare enough to not break anything.
42 lines
1.4 KiB
Rust
42 lines
1.4 KiB
Rust
// Checks if the "fastcall" calling convention marks function arguments
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// as "inreg" like the C/C++ compilers for the platforms.
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// x86 only.
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// compile-flags: --target i686-unknown-linux-gnu -O -C no-prepopulate-passes
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// needs-llvm-components: x86
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#![crate_type = "lib"]
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#![no_core]
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#![feature(no_core, lang_items)]
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#[lang = "sized"]
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trait Sized {}
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#[lang = "copy"]
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trait Copy {}
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pub mod tests {
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// CHECK: @f1(i32 inreg noundef %_1, i32 inreg noundef %_2, i32 noundef %_3)
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#[no_mangle]
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pub extern "fastcall" fn f1(_: i32, _: i32, _: i32) {}
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// CHECK: @f2({{i32\*|ptr}} inreg noundef %_1, {{i32\*|ptr}} inreg noundef %_2, {{i32\*|ptr}} noundef %_3)
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#[no_mangle]
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pub extern "fastcall" fn f2(_: *const i32, _: *const i32, _: *const i32) {}
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// CHECK: @f3(float noundef %_1, i32 inreg noundef %_2, i32 inreg noundef %_3, i32 noundef %_4)
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#[no_mangle]
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pub extern "fastcall" fn f3(_: f32, _: i32, _: i32, _: i32) {}
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// CHECK: @f4(i32 inreg noundef %_1, float noundef %_2, i32 inreg noundef %_3, i32 noundef %_4)
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#[no_mangle]
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pub extern "fastcall" fn f4(_: i32, _: f32, _: i32, _: i32) {}
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// CHECK: @f5(i64 noundef %_1, i32 noundef %_2)
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#[no_mangle]
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pub extern "fastcall" fn f5(_: i64, _: i32) {}
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// CHECK: @f6(i1 inreg noundef zeroext %_1, i32 inreg noundef %_2, i32 noundef %_3)
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#[no_mangle]
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pub extern "fastcall" fn f6(_: bool, _: i32, _: i32) {}
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}
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