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Revert "runtime: remove some redundant libm functions copied inline."

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This reverts commit fee75bd50f.

LLVM does not have lround as a libcall and this inhibits LICM.
This commit is contained in:
whitequark 2016-11-08 11:53:26 +00:00
parent 6e77f65d50
commit 798a5f70df
3 changed files with 32 additions and 8 deletions
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7
artiq/compiler/transforms/llvm_ir_generator.py
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@ -323,6 +323,8 @@ class LLVMIRGenerator:
llty = ll.FunctionType(llvoid, [])
elif name == "llvm.floor.f64":
llty = ll.FunctionType(lldouble, [lldouble])
elif name == "llvm.round.f64":
llty = ll.FunctionType(lldouble, [lldouble])
elif name == "llvm.pow.f64":
llty = ll.FunctionType(lldouble, [lldouble, lldouble])
elif name == "llvm.powi.f64":
@ -347,8 +349,6 @@ class LLVMIRGenerator:
llty = ll.FunctionType(lli32, [llptr])
elif name == "strcmp":
llty = ll.FunctionType(lli32, [llptr, llptr])
elif name == "lround":
llty = ll.FunctionType(lli32, [lldouble])
elif name == "send_rpc":
llty = ll.FunctionType(llvoid, [lli32, llptr, llptrptr])
elif name == "send_async_rpc":
@ -1044,7 +1044,8 @@ class LLVMIRGenerator:
name=insn.name)
elif insn.op == "round":
llarg = self.map(insn.operands[0])
return self.llbuilder.call(self.llbuiltin("lround"), [llarg],
llvalue = self.llbuilder.call(self.llbuiltin("llvm.round.f64"), [llarg])
return self.llbuilder.fptosi(llvalue, self.llty_of_type(insn.type),
name=insn.name)
elif insn.op == "globalenv":
def get_outer(llenv, env_ty):

2
artiq/runtime.rs/libksupport/api.rs
View File

@ -74,7 +74,7 @@ static mut API: &'static [(&'static str, *const ())] = &[
/* libm */
api!(sqrt),
api!(lround),
api!(round),
/* exceptions */
api!(_Unwind_Resume),

29
artiq/runtime/ksupport_glue.c
View File

@ -70,10 +70,33 @@ int dl_iterate_phdr (int (*callback)(struct dl_phdr_info *, size_t, void *), voi
}
/* called by kernel */
long lround(double x);
long lround(double x)
double round(double x);
double round(double x)
{
return x < 0 ? floor(x) : ceil(x);
union {double f; uint64_t i;} u = {x};
int e = u.i >> 52 & 0x7ff;
double y;
if (e >= 0x3ff+52)
return x;
if (u.i >> 63)
x = -x;
if (e < 0x3ff-1) {
/* we don't do it in ARTIQ */
/* raise inexact if x!=0 */
// FORCE_EVAL(x + 0x1p52);
return 0*u.f;
}
y = (double)(x + 0x1p52) - 0x1p52 - x;
if (y > 0.5)
y = y + x - 1;
else if (y <= -0.5)
y = y + x + 1;
else
y = y + x;
if (u.i >> 63)
y = -y;
return y;
}
/* called by kernel */