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https://github.com/m-labs/artiq.git
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runtime: remove some redundant libm functions copied inline.
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whitequark
parent
e037d167f4
commit
fee75bd50f
@ -323,8 +323,6 @@ class LLVMIRGenerator:
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llty = ll.FunctionType(llvoid, [])
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elif name == "llvm.floor.f64":
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llty = ll.FunctionType(lldouble, [lldouble])
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elif name == "llvm.round.f64":
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llty = ll.FunctionType(lldouble, [lldouble])
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elif name == "llvm.pow.f64":
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llty = ll.FunctionType(lldouble, [lldouble, lldouble])
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elif name == "llvm.powi.f64":
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@ -349,6 +347,8 @@ class LLVMIRGenerator:
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llty = ll.FunctionType(lli32, [llptr])
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elif name == "strcmp":
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llty = ll.FunctionType(lli32, [llptr, llptr])
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elif name == "lround":
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llty = ll.FunctionType(lli32, [lldouble])
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elif name == "send_rpc":
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llty = ll.FunctionType(llvoid, [lli32, llptr, llptrptr])
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elif name == "recv_rpc":
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@ -1041,9 +1041,8 @@ class LLVMIRGenerator:
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name=insn.name)
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elif insn.op == "round":
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llarg = self.map(insn.operands[0])
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llvalue = self.llbuilder.call(self.llbuiltin("llvm.round.f64"), [llarg])
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return self.llbuilder.fptosi(llvalue, self.llty_of_type(insn.type),
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name=insn.name)
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return self.llbuilder.call(self.llbuiltin("lround"), [llarg],
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name=insn.name)
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elif insn.op == "globalenv":
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def get_outer(llenv, env_ty):
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if "$outer" in env_ty.params:
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@ -1,6 +1,7 @@
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include <generated/csr.h>
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#include <link.h>
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@ -21,8 +22,7 @@
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#define KERNELCPU_LAST_ADDRESS 0x4fffffff
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#define KSUPPORT_HEADER_SIZE 0x80
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double round(double x);
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double sqrt(double x);
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long lround(double x);
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void ksupport_abort(void);
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static void attribute_writeback(void *);
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@ -91,8 +91,8 @@ static const struct symbol runtime_exports[] = {
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{"__powidf2", &__powidf2},
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/* libm */
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{"round", &round},
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{"sqrt", &sqrt},
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{"lround", &lround},
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/* exceptions */
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{"_Unwind_Resume", &_Unwind_Resume},
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@ -144,133 +144,9 @@ static const struct symbol runtime_exports[] = {
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{NULL, NULL}
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};
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double round(double x)
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long lround(double x)
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{
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union {double f; uint64_t i;} u = {x};
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int e = u.i >> 52 & 0x7ff;
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double y;
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if (e >= 0x3ff+52)
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return x;
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if (u.i >> 63)
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x = -x;
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if (e < 0x3ff-1) {
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/* we don't do it in ARTIQ */
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/* raise inexact if x!=0 */
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// FORCE_EVAL(x + 0x1p52);
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return 0*u.f;
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}
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y = (double)(x + 0x1p52) - 0x1p52 - x;
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if (y > 0.5)
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y = y + x - 1;
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else if (y <= -0.5)
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y = y + x + 1;
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else
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y = y + x;
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if (u.i >> 63)
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y = -y;
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return y;
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}
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double sqrt(double x)
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{
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static const double one = 1.0, tiny = 1.0e-300;
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double z;
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int32_t sign = (int)0x80000000;
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int32_t ix0,s0,q,m,t,i;
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uint32_t r,t1,s1,ix1,q1;
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union {double f; struct{uint32_t msw; uint32_t lsw;};} u = {x};
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ix0 = u.msw;
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ix1 = u.lsw;
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/* take care of Inf and NaN */
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if((ix0&0x7ff00000)==0x7ff00000) {
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return x*x+x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
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sqrt(-inf)=sNaN */
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}
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/* take care of zero */
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if(ix0<=0) {
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if(((ix0&(~sign))|ix1)==0) return x;/* sqrt(+-0) = +-0 */
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else if(ix0<0)
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return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
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}
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/* normalize x */
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m = (ix0>>20);
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if(m==0) { /* subnormal x */
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while(ix0==0) {
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m -= 21;
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ix0 |= (ix1>>11); ix1 <<= 21;
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}
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for(i=0;(ix0&0x00100000)==0;i++) ix0<<=1;
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m -= i-1;
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ix0 |= (ix1>>(32-i));
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ix1 <<= i;
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}
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m -= 1023; /* unbias exponent */
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ix0 = (ix0&0x000fffff)|0x00100000;
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if(m&1){ /* odd m, double x to make it even */
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ix0 += ix0 + ((ix1&sign)>>31);
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ix1 += ix1;
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}
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m >>= 1; /* m = [m/2] */
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/* generate sqrt(x) bit by bit */
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ix0 += ix0 + ((ix1&sign)>>31);
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ix1 += ix1;
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q = q1 = s0 = s1 = 0; /* [q,q1] = sqrt(x) */
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r = 0x00200000; /* r = moving bit from right to left */
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while(r!=0) {
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t = s0+r;
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if(t<=ix0) {
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s0 = t+r;
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ix0 -= t;
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q += r;
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}
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ix0 += ix0 + ((ix1&sign)>>31);
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ix1 += ix1;
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r>>=1;
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}
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r = sign;
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while(r!=0) {
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t1 = s1+r;
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t = s0;
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if((t<ix0)||((t==ix0)&&(t1<=ix1))) {
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s1 = t1+r;
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if(((t1&sign)==sign)&&(s1&sign)==0) s0 += 1;
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ix0 -= t;
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if (ix1 < t1) ix0 -= 1;
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ix1 -= t1;
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q1 += r;
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}
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ix0 += ix0 + ((ix1&sign)>>31);
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ix1 += ix1;
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r>>=1;
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}
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/* use floating add to find out rounding direction */
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if((ix0|ix1)!=0) {
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z = one-tiny; /* trigger inexact flag */
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if (z>=one) {
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z = one+tiny;
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if (q1==(uint32_t)0xffffffff) { q1=0; q += 1;}
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else if (z>one) {
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if (q1==(uint32_t)0xfffffffe) q+=1;
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q1+=2;
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} else
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q1 += (q1&1);
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}
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}
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ix0 = (q>>1)+0x3fe00000;
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ix1 = q1>>1;
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if ((q&1)==1) ix1 |= sign;
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ix0 += (m <<20);
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u.msw = ix0;
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u.lsw = ix1;
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return u.f;
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return x < 0 ? floor(x) : ceil(x);
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}
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/* called by libunwind */
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