+ case ir_unop_find_msb:
+ for (unsigned c = 0; c < components; c++) {
+ int v = op[0]->value.i[c];
+
+ if (v == 0 || (op[0]->type->base_type == GLSL_TYPE_INT && v == -1))
+ data.i[c] = -1;
+ else {
+ int count = 0;
+ int top_bit = op[0]->type->base_type == GLSL_TYPE_UINT
+ ? 0 : v & (1 << 31);
+
+ while (((v & (1 << 31)) == top_bit) && count != 32) {
+ count++;
+ v <<= 1;
+ }
+
+ data.i[c] = count;
Assuming the bits are numbered from the LSB, this probably wants to be
data.i[c] = 32 - count;
-- Chris
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