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Fix few CSSP bugs

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This commit is contained in:
Dmitry Stogov 2022-04-19 16:45:03 +03:00
parent a1366ebd92
commit e449345514
2 changed files with 112 additions and 5 deletions
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48
ir_sccp.c
View File

@ -244,6 +244,19 @@ static void ir_sccp_replace_insn(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_r
insn->optx = IR_NOP;
}
static void ir_sccp_replace_use(ir_ctx *ctx, ir_ref ref, ir_ref use, ir_ref new_use)
{
ir_use_list *use_list = &ctx->use_lists[ref];
ir_ref i, n, *p;
n = use_list->count;
for (i = 0, p = &ctx->use_edges[use_list->refs]; i < n; i++, p++) {
if (*p == use) {
*p = new_use;
}
}
}
static void ir_sccp_remove_if(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_ref dst)
{
ir_ref j, n, *p, use, next;
@ -259,7 +272,7 @@ static void ir_sccp_remove_if(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_ref
next_insn = &ctx->ir_base[next];
/* remove IF and IF_TRUE/FALSE from double linked control list */
next_insn->op1 = insn->op1;
ctx->use_edges[ctx->use_lists[insn->op1].refs] = next;
ir_sccp_replace_use(ctx, insn->op1, ref, next);
/* remove IF and IF_TRUE/FALSE instructions */
ir_sccp_replace_insn(ctx, _values, ref, IR_UNUSED);
ir_sccp_replace_insn(ctx, _values, use, IR_UNUSED);
@ -303,7 +316,7 @@ static void ir_sccp_remove_unreachable_merge_inputs(ir_ctx *ctx, ir_insn *_value
IR_ASSERT(prev && next);
/* remove MERGE and input END from double linked control list */
next_insn->op1 = prev;
ctx->use_edges[ctx->use_lists[prev].refs] = next;
ir_sccp_replace_use(ctx, prev, input, next);
/* remove MERGE and input END instructions */
ir_sccp_replace_insn(ctx, _values, ref, IR_UNUSED);
ir_sccp_replace_insn(ctx, _values, input, IR_UNUSED);
@ -560,7 +573,13 @@ int ir_sccp(ir_ctx *ctx)
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < n; j++, p++) {
use = *p;
insn = &ctx->ir_base[use];
if (insn->op != IR_PHI || IR_IS_REACHABLE(insn->op1)) {
if ((ir_op_flags[insn->op] & IR_OP_FLAG_DATA)) {
if (insn->op != IR_PHI || IR_IS_REACHABLE(insn->op1)) {
if (!IR_IS_BOTTOM(use)) {
ir_bitset_incl(worklist, use);
}
}
} else if (insn->op == IR_MERGE || insn->op == IR_LOOP_BEGIN || IR_IS_REACHABLE(insn->op1)) {
if (!IR_IS_BOTTOM(use)) {
ir_bitset_incl(worklist, use);
}
@ -600,8 +619,27 @@ int ir_sccp(ir_ctx *ctx)
ir_sccp_replace_insn(ctx, _values, i, _values[i].op1);
#endif
} else if (IR_IS_TOP(i)) {
if (ctx->ir_base[i].op != IR_PARAM && ctx->ir_base[i].op != IR_VAR) {
/* remove unreachable instruction */
/* remove unreachable instruction */
insn = &ctx->ir_base[i];
if (ir_op_flags[insn->op] & IR_OP_FLAG_DATA) {
if (insn->op != IR_PARAM && insn->op != IR_VAR) {
ir_sccp_replace_insn(ctx, _values, i, IR_UNUSED);
}
} else {
if (insn->op == IR_RETURN || insn->op == IR_UNREACHABLE) {
ir_ref ref = ctx->ir_base[1].op1;
if (ref == i) {
ctx->ir_base[1].op1 = insn->op3;
} else {
do {
if (ctx->ir_base[ref].op3 == i) {
ctx->ir_base[ref].op3 = insn->op3;
break;
}
ref = ctx->ir_base[ref].op3;
} while (ref);
}
}
ir_sccp_replace_insn(ctx, _values, i, IR_UNUSED);
}
} else if (_values[i].op == IR_IF) {

69
tests/025.irt Normal file
View File

@ -0,0 +1,69 @@
--TEST--
025: SCCP+DCE (Removing RETURN nodes)
--ARGS--
--save
--CODE--
{
uintptr_t c_1 = 0;
bool c_2 = 0;
bool c_3 = 1;
double c_4 = 0.5;
double c_5 = 0;
int32_t c_6 = 1000;
int32_t c_7 = 1;
double c_8 = 16;
int32_t c_9 = 1000;
l_1 = START(l_35);
double d_2 = PARAM(l_1, "x", 0);
double d_3 = PARAM(l_1, "y", 1);
double d_4 = VAR(l_1, "cr");
double d_5 = SUB(d_3, c_4);
double d_6 = VAR(l_1, "ci");
double d_7 = VAR(l_1, "zi");
double d_8 = VAR(l_1, "zr");
int32_t d_9 = VAR(l_1, "i");
l_10 = END(l_1);
l_11 = LOOP_BEGIN(l_10, l_37);
double d_12 = PHI(l_11, c_5, d_25);
double d_13 = PHI(l_11, c_5, d_23);
int32_t d_14 = PHI(l_11, c_6, d_15);
int32_t d_15 = ADD(d_14, c_7);
double d_16 = VAR(l_11, "temp");
double d_17 = MUL(d_13, d_12);
double d_18 = VAR(l_11, "zr2");
double d_19 = MUL(d_13, d_13);
double d_20 = VAR(l_11, "zi2");
double d_21 = MUL(d_12, d_12);
double d_22 = SUB(d_19, d_21);
double d_23 = ADD(d_22, d_5);
double d_24 = ADD(d_17, d_17);
double d_25 = ADD(d_24, d_2);
double d_26 = ADD(d_21, d_19);
bool d_27 = GT(d_26, c_8);
l_28 = IF(l_11, d_27);
l_29 = IF_TRUE(l_28);
l_30 = RETURN(l_29, d_15);
l_31 = IF_FALSE(l_28);
bool d_32 = GT(d_15, c_9);
l_33 = IF(l_31, d_32);
l_34 = IF_TRUE(l_33);
l_35 = RETURN(l_34, c_6, l_30);
l_36 = IF_FALSE(l_33);
l_37 = LOOP_END(l_36, l_11);
}
--EXPECT--
{
uintptr_t c_1 = 0;
bool c_2 = 0;
bool c_3 = 1;
int32_t c_4 = 1000;
l_1 = START(l_9);
double d_2 = PARAM(l_1, "x", 0);
double d_3 = PARAM(l_1, "y", 1);
double d_4 = VAR(l_1, "cr");
double d_5 = VAR(l_1, "ci");
double d_6 = VAR(l_1, "zi");
double d_7 = VAR(l_1, "zr");
int32_t d_8 = VAR(l_1, "i");
l_9 = RETURN(l_1, c_4);
}