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glsl: Avoid division-by-zero during constant-folding

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Avoid division-by-zero when constant-folding the following expression
types:
    ir_unop_rsq
    ir_binop_div
    ir_binop_mod

Fixes bugs:
https://bugs.freedesktop.org//show_bug.cgi?id=33306
https://bugs.freedesktop.org//show_bug.cgi?id=33508

Fixes Piglit tests:
glslparsertest/glsl2/div-by-zero-01.frag
glslparsertest/glsl2/div-by-zero-02.frag
glslparsertest/glsl2/div-by-zero-03.frag
glslparsertest/glsl2/modulus-zero-01.frag
glslparsertest/glsl2/modulus-zero-02.frag

NOTE: This is a candidate for the 7.9 and 7.10 branches.
This commit is contained in:
Chad Versace
2011-02-01 10:14:28 -08:00
parent b3cf92aa91
commit e7c1f058d1
1 changed files with 19 additions and 1 deletions
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20
src/glsl/ir_constant_expression.cpp
View File

@@ -314,9 +314,13 @@ ir_expression::constant_expression_value()
break;
case ir_unop_rsq:
/* FINISHME: Emit warning when division-by-zero is detected. */
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < op[0]->type->components(); c++) {
data.f[c] = 1.0F / sqrtf(op[0]->value.f[c]);
float s = sqrtf(op[0]->value.f[c]);
if (s == 0)
return NULL;
data.f[c] = 1.0F / s;
}
break;
@@ -511,6 +515,7 @@ ir_expression::constant_expression_value()
break;
case ir_binop_div:
/* FINISHME: Emit warning when division-by-zero is detected. */
assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
@@ -518,12 +523,18 @@ ir_expression::constant_expression_value()
switch (op[0]->type->base_type) {
case GLSL_TYPE_UINT:
if (op[1]->value.u[c1] == 0)
return NULL;
data.u[c] = op[0]->value.u[c0] / op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
if (op[1]->value.i[c1] == 0)
return NULL;
data.i[c] = op[0]->value.i[c0] / op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
if (op[1]->value.f[c1] == 0)
return NULL;
data.f[c] = op[0]->value.f[c0] / op[1]->value.f[c1];
break;
default:
@@ -533,6 +544,7 @@ ir_expression::constant_expression_value()
break;
case ir_binop_mod:
/* FINISHME: Emit warning when division-by-zero is detected. */
assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
@@ -540,12 +552,18 @@ ir_expression::constant_expression_value()
switch (op[0]->type->base_type) {
case GLSL_TYPE_UINT:
if (op[1]->value.u[c1] == 0)
return NULL;
data.u[c] = op[0]->value.u[c0] % op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
if (op[1]->value.i[c1] == 0)
return NULL;
data.i[c] = op[0]->value.i[c0] % op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
if (op[1]->value.f[c1] == 0)
return NULL;
/* We don't use fmod because it rounds toward zero; GLSL specifies
* the use of floor.
*/