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[PATCH] Allow FSM to thread single block cases too 

* tree-ssa-threadbackward.c (fsm_find_control_statement_thread_paths):
	Allow single block jump threading paths.

	* gcc.dg/tree-ssa/ssa-thread-13.c: New test.

From-SVN: r228757
This commit is contained in:
Jeff Law 2015-10-13 06:20:06 -06:00 committed by Jeff Law
parent 1f600feab0
commit 92a1d1e1d0
4 changed files with 79 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-10-13 Jeff Law <law@redhat.com>
* tree-ssa-threadbackward.c (fsm_find_control_statement_thread_paths):
Allow single block jump threading paths.
2015-10-13 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/67476

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2015-10-13 Jeff Law <law@redhat.com>
* gcc.dg/tree-ssa/ssa-thread-13.c: New test.
2015-10-12 Jeff Law <law@redhat.com>
* gcc.dg/tree-ssa/ssa-thread-12.c: New test.

70
gcc/testsuite/gcc.dg/tree-ssa/ssa-thread-13.c Normal file
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@ -0,0 +1,70 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
/* { dg-final { scan-tree-dump "FSM" "vrp1" } } */
typedef struct rtx_def *rtx;
typedef const struct rtx_def *const_rtx;
enum rtx_code
{
UNKNOWN, VALUE, DEBUG_EXPR, EXPR_LIST, INSN_LIST, SEQUENCE, ADDRESS,
DEBUG_INSN, INSN, JUMP_INSN, CALL_INSN, BARRIER, CODE_LABEL, NOTE,
COND_EXEC, PARALLEL, ASM_INPUT, ASM_OPERANDS, UNSPEC, UNSPEC_VOLATILE,
ADDR_VEC, ADDR_DIFF_VEC, PREFETCH, SET, USE, CLOBBER, CALL, RETURN,
EH_RETURN, TRAP_IF, CONST_INT, CONST_FIXED, CONST_DOUBLE, CONST_VECTOR,
CONST_STRING, CONST, PC, REG, SCRATCH, SUBREG, STRICT_LOW_PART, CONCAT,
CONCATN, MEM, LABEL_REF, SYMBOL_REF, CC0, IF_THEN_ELSE, COMPARE, PLUS,
MINUS, NEG, MULT, SS_MULT, US_MULT, DIV, SS_DIV, US_DIV, MOD, UDIV, UMOD,
AND, IOR, XOR, NOT, ASHIFT, ROTATE, ASHIFTRT, LSHIFTRT, ROTATERT, SMIN,
SMAX, UMIN, UMAX, PRE_DEC, PRE_INC, POST_DEC, POST_INC, PRE_MODIFY,
POST_MODIFY, NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU, LTU, UNORDERED,
ORDERED, UNEQ, UNGE, UNGT, UNLE, UNLT, LTGT, SIGN_EXTEND, ZERO_EXTEND,
TRUNCATE, FLOAT_EXTEND, FLOAT_TRUNCATE, FLOAT, FIX, UNSIGNED_FLOAT,
UNSIGNED_FIX, FRACT_CONVERT, UNSIGNED_FRACT_CONVERT, SAT_FRACT,
UNSIGNED_SAT_FRACT, ABS, SQRT, BSWAP, FFS, CLZ, CTZ, POPCOUNT, PARITY,
SIGN_EXTRACT, ZERO_EXTRACT, HIGH, LO_SUM, VEC_MERGE, VEC_SELECT,
VEC_CONCAT, VEC_DUPLICATE, SS_PLUS, US_PLUS, SS_MINUS, SS_NEG, US_NEG,
SS_ABS, SS_ASHIFT, US_ASHIFT, US_MINUS, SS_TRUNCATE, US_TRUNCATE, FMA,
VAR_LOCATION, DEBUG_IMPLICIT_PTR, ENTRY_VALUE, LAST_AND_UNUSED_RTX_CODE
};
union rtunion_def
{
rtx rt_rtx;
};
typedef union rtunion_def rtunion;
struct rtx_def
{
__extension__ enum rtx_code code:16;
union u
{
rtunion fld[1];
}
u;
};
unsigned int rtx_cost (rtx, enum rtx_code, unsigned char);
rtx single_set_2 (const_rtx, rtx);
unsigned
seq_cost (const_rtx seq, unsigned char speed)
{
unsigned cost = 0;
rtx set;
for (; seq; seq = (((seq)->u.fld[2]).rt_rtx))
{
set =
(((((enum rtx_code) (seq)->code) == INSN)
|| (((enum rtx_code) (seq)->code) == DEBUG_INSN)
|| (((enum rtx_code) (seq)->code) == JUMP_INSN)
|| (((enum rtx_code) (seq)->code) ==
CALL_INSN)) ? (((enum rtx_code) ((((seq)->u.fld[4]).rt_rtx))->
code) ==
SET ? (((seq)->u.fld[4]).
rt_rtx) : single_set_2 (seq,
(((seq)->u.
fld[4]).
rt_rtx))) : (rtx)
0);
if (set)
cost += rtx_cost (set, SET, speed);
}
}

4
gcc/tree-ssa-threadbackward.c
View File

@ -211,10 +211,6 @@ fsm_find_control_statement_thread_paths (tree name,
continue;
int path_length = path->length ();
/* A path with less than 2 basic blocks should not be jump-threaded. */
if (path_length < 2)
continue;
if (path_length > PARAM_VALUE (PARAM_MAX_FSM_THREAD_LENGTH))
{
if (dump_file && (dump_flags & TDF_DETAILS))