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mirror of https://github.com/m-labs/artiq.git synced 2024-12-19 16:36:29 +08:00

runtime: remove some redundant libm functions copied inline.

This commit is contained in:
whitequark 2016-10-15 23:38:54 +00:00
parent e037d167f4
commit fee75bd50f
2 changed files with 9 additions and 134 deletions

View File

@ -323,8 +323,6 @@ 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":
@ -349,6 +347,8 @@ 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 == "recv_rpc":
@ -1041,8 +1041,7 @@ class LLVMIRGenerator:
name=insn.name)
elif insn.op == "round":
llarg = self.map(insn.operands[0])
llvalue = self.llbuilder.call(self.llbuiltin("llvm.round.f64"), [llarg])
return self.llbuilder.fptosi(llvalue, self.llty_of_type(insn.type),
return self.llbuilder.call(self.llbuiltin("lround"), [llarg],
name=insn.name)
elif insn.op == "globalenv":
def get_outer(llenv, env_ty):

View File

@ -1,6 +1,7 @@
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <generated/csr.h>
#include <link.h>
@ -21,8 +22,7 @@
#define KERNELCPU_LAST_ADDRESS 0x4fffffff
#define KSUPPORT_HEADER_SIZE 0x80
double round(double x);
double sqrt(double x);
long lround(double x);
void ksupport_abort(void);
static void attribute_writeback(void *);
@ -91,8 +91,8 @@ static const struct symbol runtime_exports[] = {
{"__powidf2", &__powidf2},
/* libm */
{"round", &round},
{"sqrt", &sqrt},
{"lround", &lround},
/* exceptions */
{"_Unwind_Resume", &_Unwind_Resume},
@ -144,133 +144,9 @@ static const struct symbol runtime_exports[] = {
{NULL, NULL}
};
double round(double x)
long lround(double 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;
}
double sqrt(double x)
{
static const double one = 1.0, tiny = 1.0e-300;
double z;
int32_t sign = (int)0x80000000;
int32_t ix0,s0,q,m,t,i;
uint32_t r,t1,s1,ix1,q1;
union {double f; struct{uint32_t msw; uint32_t lsw;};} u = {x};
ix0 = u.msw;
ix1 = u.lsw;
/* take care of Inf and NaN */
if((ix0&0x7ff00000)==0x7ff00000) {
return x*x+x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
sqrt(-inf)=sNaN */
}
/* take care of zero */
if(ix0<=0) {
if(((ix0&(~sign))|ix1)==0) return x;/* sqrt(+-0) = +-0 */
else if(ix0<0)
return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
}
/* normalize x */
m = (ix0>>20);
if(m==0) { /* subnormal x */
while(ix0==0) {
m -= 21;
ix0 |= (ix1>>11); ix1 <<= 21;
}
for(i=0;(ix0&0x00100000)==0;i++) ix0<<=1;
m -= i-1;
ix0 |= (ix1>>(32-i));
ix1 <<= i;
}
m -= 1023; /* unbias exponent */
ix0 = (ix0&0x000fffff)|0x00100000;
if(m&1){ /* odd m, double x to make it even */
ix0 += ix0 + ((ix1&sign)>>31);
ix1 += ix1;
}
m >>= 1; /* m = [m/2] */
/* generate sqrt(x) bit by bit */
ix0 += ix0 + ((ix1&sign)>>31);
ix1 += ix1;
q = q1 = s0 = s1 = 0; /* [q,q1] = sqrt(x) */
r = 0x00200000; /* r = moving bit from right to left */
while(r!=0) {
t = s0+r;
if(t<=ix0) {
s0 = t+r;
ix0 -= t;
q += r;
}
ix0 += ix0 + ((ix1&sign)>>31);
ix1 += ix1;
r>>=1;
}
r = sign;
while(r!=0) {
t1 = s1+r;
t = s0;
if((t<ix0)||((t==ix0)&&(t1<=ix1))) {
s1 = t1+r;
if(((t1&sign)==sign)&&(s1&sign)==0) s0 += 1;
ix0 -= t;
if (ix1 < t1) ix0 -= 1;
ix1 -= t1;
q1 += r;
}
ix0 += ix0 + ((ix1&sign)>>31);
ix1 += ix1;
r>>=1;
}
/* use floating add to find out rounding direction */
if((ix0|ix1)!=0) {
z = one-tiny; /* trigger inexact flag */
if (z>=one) {
z = one+tiny;
if (q1==(uint32_t)0xffffffff) { q1=0; q += 1;}
else if (z>one) {
if (q1==(uint32_t)0xfffffffe) q+=1;
q1+=2;
} else
q1 += (q1&1);
}
}
ix0 = (q>>1)+0x3fe00000;
ix1 = q1>>1;
if ((q&1)==1) ix1 |= sign;
ix0 += (m <<20);
u.msw = ix0;
u.lsw = ix1;
return u.f;
return x < 0 ? floor(x) : ceil(x);
}
/* called by libunwind */