95 lines
1.5 KiB
C
95 lines
1.5 KiB
C
#include "mcg.h"
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static ARRAYOF(struct ir) allirs;
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static ARRAYOF(struct ir) rootirs;
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static void addall(struct ir* ir)
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{
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if (array_appendu(&allirs, ir))
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return;
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if (ir->left)
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addall(ir->left);
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if (ir->right)
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addall(ir->right);
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}
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static void collect_irs(void)
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{
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int i;
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allirs.count = rootirs.count = 0;
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for (i=0; i<current_proc->blocks.count; i++)
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{
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struct basicblock* bb = current_proc->blocks.item[i];
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int j;
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for (j=0; j<bb->irs.count; j++)
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{
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struct ir* ir = bb->irs.item[j];
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addall(ir);
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array_append(&rootirs, ir);
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}
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}
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}
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static void clear_roots(void)
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{
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int i;
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for (i=0; i<allirs.count; i++)
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{
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struct ir* ir = allirs.item[i];
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ir->root = NULL;
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}
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}
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static void find_roots(void)
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{
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int i;
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for (i=0; i<rootirs.count; i++)
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{
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struct ir* ir = rootirs.item[i];
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assert(!ir->root);
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ir->root = ir;
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}
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}
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static void recursively_mark_root(struct ir* node, struct ir* root)
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{
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if (node != root)
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{
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if (node->root)
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return;
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node->root = root;
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}
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if (node->left)
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recursively_mark_root(node->left, root);
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if (node->right)
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recursively_mark_root(node->right, root);
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}
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static void find_non_roots(void)
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{
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int i;
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for (i=0; i<rootirs.count; i++)
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{
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struct ir* ir = rootirs.item[i];
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recursively_mark_root(ir, ir);
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}
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}
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void pass_group_irs(void)
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{
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collect_irs();
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clear_roots();
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find_roots();
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find_non_roots();
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}
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/* vim: set sw=4 ts=4 expandtab : */
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