diff options
| -rw-r--r-- | src/librustc_trans/trans/context.rs | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/librustc_trans/trans/context.rs b/src/librustc_trans/trans/context.rs index f2de949ccd5..42e2efa9062 100644 --- a/src/librustc_trans/trans/context.rs +++ b/src/librustc_trans/trans/context.rs @@ -933,11 +933,33 @@ fn declare_intrinsic(ccx: &CrateContext, key: & &'static str) -> Option<ValueRef ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void); ifn!("llvm.expect.i1", fn(i1, i1) -> i1); - ifn!("llvm.assume", fn(i1) -> void); // Some intrinsics were introduced in later versions of LLVM, but they have // fallbacks in libc or libm and such. macro_rules! compatible_ifn { + ($name:expr, noop($cname:ident ($($arg:expr),*) -> void), $llvm_version:expr) => ( + if unsafe { llvm::LLVMVersionMinor() >= $llvm_version } { + // The `if key == $name` is already in ifn! + ifn!($name, fn($($arg),*) -> void); + } else if *key == $name { + let f = declare::declare_cfn(ccx, stringify!($cname), + Type::func(&[$($arg),*], &void), + ty::mk_nil(ccx.tcx())); + llvm::SetLinkage(f, llvm::InternalLinkage); + + let bld = ccx.builder(); + let llbb = unsafe { + llvm::LLVMAppendBasicBlockInContext(ccx.llcx(), f, + "entry-block\0".as_ptr() as *const _) + }; + + bld.position_at_end(llbb); + bld.ret_void(); + + ccx.intrinsics().borrow_mut().insert($name, f.clone()); + return Some(f); + } + ); ($name:expr, $cname:ident ($($arg:expr),*) -> $ret:expr, $llvm_version:expr) => ( if unsafe { llvm::LLVMVersionMinor() >= $llvm_version } { // The `if key == $name` is already in ifn! @@ -952,6 +974,8 @@ fn declare_intrinsic(ccx: &CrateContext, key: & &'static str) -> Option<ValueRef ) } + compatible_ifn!("llvm.assume", noop(llvmcompat_assume(i1) -> void), 6); + if ccx.sess().opts.debuginfo != NoDebugInfo { ifn!("llvm.dbg.declare", fn(Type::metadata(ccx), Type::metadata(ccx)) -> void); ifn!("llvm.dbg.value", fn(Type::metadata(ccx), t_i64, Type::metadata(ccx)) -> void); |