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Use small code model for UEFI targets #87124

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Merged
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Jul 17, 2021
+2 −6
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Use small code model for UEFI targets #87124

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8 changes: 2 additions & 6 deletions compiler/rustc_target/src/spec/x86_64_unknown_uefi.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
// The win64 ABI is used. It differs from the sysv64 ABI, so we must use a windows target with
// LLVM. "x86_64-unknown-windows" is used to get the minimal subset of windows-specific features.

use crate::spec::{CodeModel, Target};
use crate::spec::Target;

pub fn target() -> Target {
let mut base = super::uefi_msvc_base::opts();
Expand All @@ -19,15 +19,11 @@ pub fn target() -> Target {
// to leave these uninitialized, thus triggering exceptions if we make use of them. Which is
// why we avoid them and instead use soft-floats. This is also what GRUB and friends did so
// far.
//
// If you initialize FP units yourself, you can override these flags with custom linker
// arguments, thus giving you access to full MMX/SSE acceleration.
base.features = "-mmx,-sse,+soft-float".to_string();

// UEFI systems run without a host OS, hence we cannot assume any code locality. We must tell
// LLVM to expect code to reference any address in the address-space. The "large" code-model
// places no locality-restrictions, so it fits well here.
base.code_model = Some(CodeModel::Large);

Target {
llvm_target: "x86_64-unknown-windows".to_string(),
pointer_width: 64,
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