* @author Jose Fonseca <jfonseca@vmware.com>
*/
+#include <float.h>
#include "util/u_debug.h"
#include "lp_bld_const.h"
+unsigned
+lp_mantissa(struct lp_type type)
+{
+ assert(type.floating);
+
+ if(type.floating) {
+ switch(type.width) {
+ case 32:
+ return 23;
+ case 64:
+ return 53;
+ default:
+ assert(0);
+ return 0;
+ }
+ }
+ else {
+ if(type.sign)
+ return type.width - 1;
+ else
+ return type.width;
+ }
+}
+
+
+/**
+ * Shift of the unity.
+ *
+ * Same as lp_const_scale(), but in terms of shifts.
+ */
+unsigned
+lp_const_shift(struct lp_type type)
+{
+ if(type.floating)
+ return 0;
+ else if(type.fixed)
+ return type.width/2;
+ else if(type.norm)
+ return type.sign ? type.width - 1 : type.width;
+ else
+ return 0;
+}
+
+
+unsigned
+lp_const_offset(struct lp_type type)
+{
+ if(type.floating || type.fixed)
+ return 0;
+ else if(type.norm)
+ return 1;
+ else
+ return 0;
+}
+
+
+/**
+ * Scaling factor between the LLVM native value and its interpretation.
+ *
+ * This is 1.0 for all floating types and unnormalized integers, and something
+ * else for the fixed points types and normalized integers.
+ */
+double
+lp_const_scale(struct lp_type type)
+{
+ unsigned long long llscale;
+ double dscale;
+
+ llscale = (unsigned long long)1 << lp_const_shift(type);
+ llscale -= lp_const_offset(type);
+ dscale = (double)llscale;
+ assert((unsigned long long)dscale == llscale);
+
+ return dscale;
+}
+
+
+/**
+ * Minimum value representable by the type.
+ */
+double
+lp_const_min(struct lp_type type)
+{
+ unsigned bits;
+
+ if(!type.sign)
+ return 0.0;
+
+ if(type.norm)
+ return -1.0;
+
+ if (type.floating) {
+ switch(type.width) {
+ case 32:
+ return -FLT_MAX;
+ case 64:
+ return -DBL_MAX;
+ default:
+ assert(0);
+ return 0.0;
+ }
+ }
+
+ if(type.fixed)
+ /* FIXME: consider the fractional bits? */
+ bits = type.width / 2 - 1;
+ else
+ bits = type.width - 1;
+
+ return (double)-((long long)1 << bits);
+}
+
+
+/**
+ * Maximum value representable by the type.
+ */
+double
+lp_const_max(struct lp_type type)
+{
+ unsigned bits;
+
+ if(type.norm)
+ return 1.0;
+
+ if (type.floating) {
+ switch(type.width) {
+ case 32:
+ return FLT_MAX;
+ case 64:
+ return DBL_MAX;
+ default:
+ assert(0);
+ return 0.0;
+ }
+ }
+
+ if(type.fixed)
+ bits = type.width / 2;
+ else
+ bits = type.width;
+
+ if(type.sign)
+ bits -= 1;
+
+ return (double)(((unsigned long long)1 << bits) - 1);
+}
+
+
+double
+lp_const_eps(struct lp_type type)
+{
+ if (type.floating) {
+ switch(type.width) {
+ case 32:
+ return FLT_EPSILON;
+ case 64:
+ return DBL_EPSILON;
+ default:
+ assert(0);
+ return 0.0;
+ }
+ }
+ else {
+ double scale = lp_const_scale(type);
+ return 1.0/scale;
+ }
+}
+
+
LLVMValueRef
-lp_build_undef(union lp_type type)
+lp_build_undef(struct lp_type type)
{
LLVMTypeRef vec_type = lp_build_vec_type(type);
return LLVMGetUndef(vec_type);
LLVMValueRef
-lp_build_zero(union lp_type type)
+lp_build_zero(struct lp_type type)
{
LLVMTypeRef vec_type = lp_build_vec_type(type);
return LLVMConstNull(vec_type);
LLVMValueRef
-lp_build_one(union lp_type type)
+lp_build_one(struct lp_type type)
{
LLVMTypeRef elem_type;
LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
elems[0] = LLVMConstInt(elem_type, 1LL << (type.width/2), 0);
else if(!type.norm)
elems[0] = LLVMConstInt(elem_type, 1, 0);
+ else if(type.sign)
+ elems[0] = LLVMConstInt(elem_type, (1LL << (type.width - 1)) - 1, 0);
else {
/* special case' -- 1.0 for normalized types is more easily attained if
* we start with a vector consisting of all bits set */
LLVMTypeRef vec_type = LLVMVectorType(elem_type, type.length);
LLVMValueRef vec = LLVMConstAllOnes(vec_type);
+#if 0
if(type.sign)
- vec = LLVMConstLShr(vec, LLVMConstInt(LLVMInt32Type(), 1, 0));
+ /* TODO: Unfortunately this caused "Tried to create a shift operation
+ * on a non-integer type!" */
+ vec = LLVMConstLShr(vec, lp_build_int_const_scalar(type, 1));
+#endif
return vec;
}
LLVMValueRef
-lp_build_const_aos(union lp_type type,
+lp_build_const_scalar(struct lp_type type,
+ double val)
+{
+ LLVMTypeRef elem_type = lp_build_elem_type(type);
+ LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
+ unsigned i;
+
+ assert(type.length <= LP_MAX_VECTOR_LENGTH);
+
+ if(type.floating) {
+ elems[0] = LLVMConstReal(elem_type, val);
+ }
+ else {
+ double dscale = lp_const_scale(type);
+
+ elems[0] = LLVMConstInt(elem_type, val*dscale + 0.5, 0);
+ }
+
+ for(i = 1; i < type.length; ++i)
+ elems[i] = elems[0];
+
+ return LLVMConstVector(elems, type.length);
+}
+
+
+LLVMValueRef
+lp_build_int_const_scalar(struct lp_type type,
+ long long val)
+{
+ LLVMTypeRef elem_type = lp_build_int_elem_type(type);
+ LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
+ unsigned i;
+
+ assert(type.length <= LP_MAX_VECTOR_LENGTH);
+
+ for(i = 0; i < type.length; ++i)
+ elems[i] = LLVMConstInt(elem_type, val, type.sign ? 1 : 0);
+
+ return LLVMConstVector(elems, type.length);
+}
+
+
+LLVMValueRef
+lp_build_const_aos(struct lp_type type,
double r, double g, double b, double a,
const unsigned char *swizzle)
{
elems[swizzle[3]] = LLVMConstReal(elem_type, a);
}
else {
- unsigned shift;
- long long llscale;
- double dscale;
-
- if(type.fixed)
- shift = type.width/2;
- else if(type.norm)
- shift = type.sign ? type.width - 1 : type.width;
- else
- shift = 0;
-
- llscale = (long long)1 << shift;
- dscale = (double)llscale;
- assert((long long)dscale == llscale);
+ double dscale = lp_const_scale(type);
elems[swizzle[0]] = LLVMConstInt(elem_type, r*dscale + 0.5, 0);
elems[swizzle[1]] = LLVMConstInt(elem_type, g*dscale + 0.5, 0);
LLVMValueRef
-lp_build_const_shift(union lp_type type,
- int c)
-{
- LLVMTypeRef elem_type = LLVMIntType(type.width);
- LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
- unsigned i;
-
- assert(type.length <= LP_MAX_VECTOR_LENGTH);
-
- for(i = 0; i < type.length; ++i)
- elems[i] = LLVMConstInt(elem_type, c, 0);
-
- return LLVMConstVector(elems, type.length);
-}
-
-
-LLVMValueRef
-lp_build_const_mask_aos(union lp_type type,
- boolean cond[4])
+lp_build_const_mask_aos(struct lp_type type,
+ const boolean cond[4])
{
LLVMTypeRef elem_type = LLVMIntType(type.width);
LLVMValueRef masks[LP_MAX_VECTOR_LENGTH];
projects / mesa.git / blobdiff