+static void lp_exec_bgnloop(struct lp_exec_mask *mask)
+{
+
+ if (mask->cont_stack_size == 0)
+ mask->cont_mask = LLVMConstAllOnes(mask->int_vec_type);
+ if (mask->break_stack_size == 0)
+ mask->break_mask = LLVMConstAllOnes(mask->int_vec_type);
+ if (mask->cond_stack_size == 0)
+ mask->cond_mask = LLVMConstAllOnes(mask->int_vec_type);
+
+ mask->break_stack[mask->break_stack_size++] = mask->break_mask;
+ mask->cont_stack[mask->cont_stack_size++] = mask->cont_mask;
+ mask->loop_stack[mask->loop_stack_size++] = mask->loop_block;
+ mask->loop_block = lp_build_insert_new_block(mask->bld->builder, "bgnloop");
+ LLVMBuildBr(mask->bld->builder, mask->loop_block);
+ LLVMPositionBuilderAtEnd(mask->bld->builder, mask->loop_block);
+
+ lp_exec_mask_update(mask);
+}
+
+static void lp_exec_break(struct lp_exec_mask *mask)
+{
+ LLVMValueRef exec_mask = LLVMBuildNot(mask->bld->builder,
+ mask->exec_mask,
+ "break");
+
+ /* mask->break_stack_size > 1 implies that we encountered a break
+ * statemant already and if that's the case we want to make sure
+ * our mask is a combination of the previous break and the current
+ * execution mask */
+ if (mask->break_stack_size > 1) {
+ mask->break_mask = LLVMBuildAnd(mask->bld->builder,
+ mask->break_mask,
+ exec_mask, "break_full");
+ } else
+ mask->break_mask = exec_mask;
+
+ lp_exec_mask_update(mask);
+}
+
+static void lp_exec_continue(struct lp_exec_mask *mask)
+{
+ LLVMValueRef exec_mask = LLVMBuildNot(mask->bld->builder,
+ mask->exec_mask,
+ "");
+
+ if (mask->cont_stack_size > 1) {
+ mask->cont_mask = LLVMBuildAnd(mask->bld->builder,
+ mask->cont_mask,
+ exec_mask, "");
+ } else
+ mask->cont_mask = exec_mask;
+
+ lp_exec_mask_update(mask);
+}
+
+
+static void lp_exec_endloop(struct lp_exec_mask *mask)
+{
+ LLVMBasicBlockRef endloop;
+ LLVMTypeRef reg_type = LLVMIntType(mask->bld->type.width*
+ mask->bld->type.length);
+ LLVMValueRef i1cond;
+
+ assert(mask->break_mask);
+
+ /* i1cond = (mask == 0) */
+ i1cond = LLVMBuildICmp(
+ mask->bld->builder,
+ LLVMIntNE,
+ LLVMBuildBitCast(mask->bld->builder, mask->break_mask, reg_type, ""),
+ LLVMConstNull(reg_type), "");
+
+ endloop = lp_build_insert_new_block(mask->bld->builder, "endloop");
+
+ LLVMBuildCondBr(mask->bld->builder,
+ i1cond, mask->loop_block, endloop);
+
+ LLVMPositionBuilderAtEnd(mask->bld->builder, endloop);
+
+ mask->loop_block = mask->loop_stack[--mask->loop_stack_size];
+ /* pop the cont mask */
+ if (mask->cont_stack_size) {
+ mask->cont_mask = mask->cont_stack[--mask->cont_stack_size];
+ }
+ /* pop the break mask */
+ if (mask->break_stack_size) {
+ mask->break_mask = mask->break_stack[--mask->break_stack_size];
+ }
+
+ lp_exec_mask_update(mask);
+}
+
+/* stores val into an address pointed to by dst.
+ * mask->exec_mask is used to figure out which bits of val
+ * should be stored into the address
+ * (0 means don't store this bit, 1 means do store).
+ */