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Make log use the slightly improved algorithm for small values.

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This commit is contained in:
Dale Weiler 2013-11-25 14:08:05 -05:00
parent 9749ec350a
commit bf127088ca
1 changed files with 112 additions and 7 deletions
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119
intrin.c
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@ -1310,7 +1310,7 @@ static ast_expression *intrin_nan(intrin_t *intrin) {
static ast_expression *intrin_inf(intrin_t *intrin) {
/*
* float nan(void) {
* float inf(void) {
* float x = 1.0f;
* float y = 0.0f;
* return x / y;
@ -1389,8 +1389,18 @@ static ast_expression *intrin_ln(intrin_t *intrin) {
* nth = 0.0f;
*
* while (whole >= base) {
* whole /= base;
* nth++;
* float base2 = base;
* float n2 = 1.0f;
* float newbase2 = base2 * base2;
*
* while (whole >= newbase2) {
* base2 = newbase2;
* n2 *= 2;
* newbase2 *= newbase2;
* }
*
* whole /= base2;
* nth += n2;
* }
*
* float b_iplus1 = n;
@ -1426,12 +1436,16 @@ static ast_expression *intrin_ln(intrin_t *intrin) {
ast_value *A_iplus1 = ast_value_new(intrin_ctx(intrin), "A_iplus1", TYPE_FLOAT);
ast_value *B_iplus1 = ast_value_new(intrin_ctx(intrin), "B_iplus1", TYPE_FLOAT);
ast_value *eps = ast_value_new(intrin_ctx(intrin), "eps", TYPE_FLOAT);
ast_value *base2 = ast_value_new(intrin_ctx(intrin), "base2", TYPE_FLOAT);
ast_value *n2 = ast_value_new(intrin_ctx(intrin), "n2", TYPE_FLOAT);
ast_value *newbase2 = ast_value_new(intrin_ctx(intrin), "newbase2", TYPE_FLOAT);
ast_block *block = ast_block_new(intrin_ctx(intrin));
ast_block *plt1orblt1 = ast_block_new(intrin_ctx(intrin)); /* (power <= 1.0f || base <= 1.0f) */
ast_block *plt1 = ast_block_new(intrin_ctx(intrin)); /* (power < 1.0f) */
ast_block *blt1 = ast_block_new(intrin_ctx(intrin)); /* (base < 1.0f) */
ast_block *forloop = ast_block_new(intrin_ctx(intrin)); /* for(;;) */
ast_block *whileloop = ast_block_new(intrin_ctx(intrin)); /* while (whole >= base) */
ast_block *nestwhile = ast_block_new(intrin_ctx(intrin)); /* while (whole >= newbase2) */
ast_function *func = intrin_value(intrin, &value, "ln", TYPE_FLOAT);
size_t i;
@ -1605,25 +1619,116 @@ static ast_expression *intrin_ln(intrin_t *intrin) {
)
);
/* whole /= base; */
/* base2 = base; */
vec_push(whileloop->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)base2,
(ast_expression*)base
)
);
/* n2 = 1.0f; */
vec_push(whileloop->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)n2,
(ast_expression*)intrin->fold->imm_float[1]
)
);
/* newbase2 = base2 * base2; */
vec_push(whileloop->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)newbase2,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_MUL_F,
(ast_expression*)base2,
(ast_expression*)base2
)
)
);
/* while loop locals */
vec_push(whileloop->locals, base2);
vec_push(whileloop->locals, n2);
vec_push(whileloop->locals, newbase2);
/* base2 = newbase2; */
vec_push(nestwhile->exprs,
(ast_expression*)ast_store_new(
intrin_ctx(intrin),
INSTR_STORE_F,
(ast_expression*)base2,
(ast_expression*)newbase2
)
);
/* n2 *= 2; */
vec_push(nestwhile->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)n2,
(ast_expression*)intrin->fold->imm_float[3] /* 2.0f */
)
);
/* newbase2 *= newbase2; */
vec_push(nestwhile->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_MUL_F,
(ast_expression*)newbase2,
(ast_expression*)newbase2
)
);
/* while (whole >= newbase2) */
vec_push(whileloop->exprs,
(ast_expression*)ast_loop_new(
intrin_ctx(intrin),
NULL,
(ast_expression*)ast_binary_new(
intrin_ctx(intrin),
INSTR_GE,
(ast_expression*)whole,
(ast_expression*)newbase2
),
false,
NULL,
false,
NULL,
(ast_expression*)nestwhile
)
);
/* whole /= base2; */
vec_push(whileloop->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_DIV_F,
(ast_expression*)whole,
(ast_expression*)base
(ast_expression*)base2
)
);
/* nth ++; */
/* nth += n2; */
vec_push(whileloop->exprs,
(ast_expression*)ast_binstore_new(
intrin_ctx(intrin),
INSTR_STORE_F,
INSTR_ADD_F,
(ast_expression*)nth,
(ast_expression*)intrin->fold->imm_float[1]
(ast_expression*)n2
)
);