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aarch64: Exclude FP intrinsics on +nofp or +nosimd #344

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Feb 28, 2020
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aarch64: Exclude FP intrinsics on +nofp or +nosimd #344

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57 changes: 40 additions & 17 deletions build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,7 @@ fn main() {
// time). This can probably be removed in the future
if !target.contains("wasm32") && !target.contains("nvptx") && !target.starts_with("riscv") {
#[cfg(feature = "c")]
c::compile(&llvm_target);
c::compile(&llvm_target, &target);
}
}

Expand Down Expand Up @@ -121,13 +121,28 @@ mod c {
}

/// Compile intrinsics from the compiler-rt C source code
pub fn compile(llvm_target: &[&str]) {
pub fn compile(llvm_target: &[&str], target: &String) {
let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
let mut consider_float_intrinsics = true;
let cfg = &mut cc::Build::new();

// AArch64 GCCs exit with an error condition when they encounter any kind of floating point
// code if the `nofp` and/or `nosimd` compiler flags have been set.
//
// Therefore, evaluate if those flags are present and set a boolean that causes any
// compiler-rt intrinsics that contain floating point source to be excluded for this target.
if target_arch == "aarch64" {
let cflags_key = String::from("CFLAGS_") + &(target.to_owned().replace("-", "_"));
if let Ok(cflags_value) = env::var(cflags_key) {
if cflags_value.contains("+nofp") || cflags_value.contains("+nosimd") {
consider_float_intrinsics = false;
}
}
}

cfg.warnings(false);

if target_env == "msvc" {
Expand Down Expand Up @@ -166,34 +181,39 @@ mod c {
("__cmpdi2", "cmpdi2.c"),
("__ctzdi2", "ctzdi2.c"),
("__ctzsi2", "ctzsi2.c"),
("__divdc3", "divdc3.c"),
("__divsc3", "divsc3.c"),
("__divxc3", "divxc3.c"),
("__extendhfsf2", "extendhfsf2.c"),
("__int_util", "int_util.c"),
("__muldc3", "muldc3.c"),
("__mulsc3", "mulsc3.c"),
("__mulvdi3", "mulvdi3.c"),
("__mulvsi3", "mulvsi3.c"),
("__mulxc3", "mulxc3.c"),
("__negdf2", "negdf2.c"),
("__negdi2", "negdi2.c"),
("__negsf2", "negsf2.c"),
("__negvdi2", "negvdi2.c"),
("__negvsi2", "negvsi2.c"),
("__paritydi2", "paritydi2.c"),
("__paritysi2", "paritysi2.c"),
("__popcountdi2", "popcountdi2.c"),
("__popcountsi2", "popcountsi2.c"),
("__powixf2", "powixf2.c"),
("__subvdi3", "subvdi3.c"),
("__subvsi3", "subvsi3.c"),
("__truncdfhf2", "truncdfhf2.c"),
("__truncdfsf2", "truncdfsf2.c"),
("__truncsfhf2", "truncsfhf2.c"),
("__ucmpdi2", "ucmpdi2.c"),
]);

if consider_float_intrinsics {
sources.extend(&[
("__divdc3", "divdc3.c"),
("__divsc3", "divsc3.c"),
("__divxc3", "divxc3.c"),
("__extendhfsf2", "extendhfsf2.c"),
("__muldc3", "muldc3.c"),
("__mulsc3", "mulsc3.c"),
("__mulxc3", "mulxc3.c"),
("__negdf2", "negdf2.c"),
("__negsf2", "negsf2.c"),
("__powixf2", "powixf2.c"),
("__truncdfhf2", "truncdfhf2.c"),
("__truncdfsf2", "truncdfsf2.c"),
("__truncsfhf2", "truncsfhf2.c"),
]);
}

// When compiling in rustbuild (the rust-lang/rust repo) this library
// also needs to satisfy intrinsics that jemalloc or C in general may
// need, so include a few more that aren't typically needed by
Expand All @@ -214,12 +234,15 @@ mod c {
("__ffsti2", "ffsti2.c"),
("__mulvti3", "mulvti3.c"),
("__negti2", "negti2.c"),
("__negvti2", "negvti2.c"),
("__parityti2", "parityti2.c"),
("__popcountti2", "popcountti2.c"),
("__subvti3", "subvti3.c"),
("__ucmpti2", "ucmpti2.c"),
]);

if consider_float_intrinsics {
sources.extend(&[("__negvti2", "negvti2.c")]);
}
}

if target_vendor == "apple" {
Expand Down Expand Up @@ -372,7 +395,7 @@ mod c {
]);
}

if target_arch == "aarch64" {
if target_arch == "aarch64" && consider_float_intrinsics {
sources.extend(&[
("__comparetf2", "comparetf2.c"),
("__extenddftf2", "extenddftf2.c"),
Expand Down