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librustc: add default per arch clobbers for asm.

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This commit is contained in:
Luqman Aden 2013-03-27 15:37:28 -07:00
parent b867fe41de
commit 778f84524b
1 changed files with 26 additions and 4 deletions
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30
src/librustc/middle/trans/asm.rs
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@ -84,11 +84,18 @@ pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block {
let mut constraints = str::connect(constraints, ",");
// Add the clobbers to our constraints list
if *ia.clobbers != ~"" && constraints != ~"" {
constraints += ~"," + *ia.clobbers;
let mut clobbers = getClobbers();
if *ia.clobbers != ~"" && clobbers != ~"" {
clobbers = *ia.clobbers + ~"," + clobbers;
} else {
constraints += *ia.clobbers;
clobbers += *ia.clobbers;
};
// Add the clobbers to our constraints list
if clobbers != ~"" && constraints != ~"" {
constraints += ~"," + clobbers;
} else {
constraints += clobbers;
}
debug!("Asm Constraints: %?", constraints);
@ -131,3 +138,18 @@ pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block {
return bcx;
}
// Default per-arch clobbers
// Basically what clang does
#[cfg(target_arch = "arm")]
#[cfg(target_arch = "mips")]
fn getClobbers() -> ~str {
~""
}
#[cfg(target_arch = "x86")]
#[cfg(target_arch = "x86_64")]
fn getClobbers() -> ~str {
~"~{dirflag},~{fpsr},~{flags}"
}