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Handle Win64 builtins ABI change in LLVM 14 #455

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Feb 16, 2022
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Handle Win64 builtins ABI change in LLVM 14 #455

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116 changes: 81 additions & 35 deletions src/float/conv.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -109,16 +109,6 @@ intrinsics! {
}
}

#[unadjusted_on_win64]
pub extern "C" fn __floattisf(i: i128) -> f32 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floattidf(i: i128) -> f64 {
int_to_float(i)
}

#[arm_aeabi_alias = __aeabi_ui2f]
pub extern "C" fn __floatunsisf(i: u32) -> f32 {
int_to_float(i)
Expand All @@ -140,16 +130,6 @@ intrinsics! {
pub extern "C" fn __floatundidf(i: u64) -> f64 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floatuntisf(i: u128) -> f32 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floatuntidf(i: u128) -> f64 {
int_to_float(i)
}
}

fn float_to_int<F: Float, I: Int>(f: F) -> I
Expand Down Expand Up @@ -224,11 +204,6 @@ intrinsics! {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixsfti(f: f32) -> i128 {
float_to_int(f)
}

#[arm_aeabi_alias = __aeabi_d2iz]
pub extern "C" fn __fixdfsi(f: f64) -> i32 {
float_to_int(f)
Expand All @@ -239,11 +214,6 @@ intrinsics! {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixdfti(f: f64) -> i128 {
float_to_int(f)
}

#[arm_aeabi_alias = __aeabi_f2uiz]
pub extern "C" fn __fixunssfsi(f: f32) -> u32 {
float_to_int(f)
Expand All @@ -254,11 +224,6 @@ intrinsics! {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixunssfti(f: f32) -> u128 {
float_to_int(f)
}

#[arm_aeabi_alias = __aeabi_d2uiz]
pub extern "C" fn __fixunsdfsi(f: f64) -> u32 {
float_to_int(f)
Expand All @@ -268,6 +233,87 @@ intrinsics! {
pub extern "C" fn __fixunsdfdi(f: f64) -> u64 {
float_to_int(f)
}
}

// The ABI for the following intrinsics changed in LLVM 14. On Win64, they now
// use Win64 ABI rather than unadjusted ABI. Pick the correct ABI based on the
// llvm14-builtins-abi target feature.

#[cfg(target_feature = "llvm14-builtins-abi")]
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Should this target feature be behind a feature gate?

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Apparently, we don't feature-gate #[cfg(target_feature)] (though we do gate #[target_feature]). cfg(target_feature) exposes all unstable target features on nightly builds.

intrinsics! {
pub extern "C" fn __floattisf(i: i128) -> f32 {
int_to_float(i)
}

pub extern "C" fn __floattidf(i: i128) -> f64 {
int_to_float(i)
}

pub extern "C" fn __floatuntisf(i: u128) -> f32 {
int_to_float(i)
}

pub extern "C" fn __floatuntidf(i: u128) -> f64 {
int_to_float(i)
}

#[win64_128bit_abi_hack]
pub extern "C" fn __fixsfti(f: f32) -> i128 {
float_to_int(f)
}

#[win64_128bit_abi_hack]
pub extern "C" fn __fixdfti(f: f64) -> i128 {
float_to_int(f)
}

#[win64_128bit_abi_hack]
pub extern "C" fn __fixunssfti(f: f32) -> u128 {
float_to_int(f)
}

#[win64_128bit_abi_hack]
pub extern "C" fn __fixunsdfti(f: f64) -> u128 {
float_to_int(f)
}
}

#[cfg(not(target_feature = "llvm14-builtins-abi"))]
intrinsics! {
#[unadjusted_on_win64]
pub extern "C" fn __floattisf(i: i128) -> f32 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floattidf(i: i128) -> f64 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floatuntisf(i: u128) -> f32 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __floatuntidf(i: u128) -> f64 {
int_to_float(i)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixsfti(f: f32) -> i128 {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixdfti(f: f64) -> i128 {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixunssfti(f: f32) -> u128 {
float_to_int(f)
}

#[unadjusted_on_win64]
pub extern "C" fn __fixunsdfti(f: f64) -> u128 {
Expand Down