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re PR rtl-optimization/13260 (Incorrect optimisation of loop termination condition) 

PR optimization/13260
	* sh-protos.h (sh_expand_t_scc): Declare.
	* sh.h (PREDICATE_CODES): Add cmpsi_operand.
	* sh.c (cmpsi_operand, sh_expand_t_scc): New functions.
	* sh.md (cmpsi): Use cmpsi_operand.  If T_REG is compared to
	something that is not a CONST_INT, copy it into a pseudo register.
	(subc): Fix description of new T value.
	(slt, sgt, sge, sgtu): Don't clobber T after rtl generation is over.
	(sltu, sleu, sgeu): Likewise.
	(seq, sne): Likewise. Use sh_expand_t_scc.

From-SVN: r74294
This commit is contained in:
J"orn Rennecke 2003-12-04 20:10:29 +00:00 committed by Joern Rennecke
parent a0a8f530d9
commit 3db1b43486
5 changed files with 84 additions and 4 deletions
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13
gcc/ChangeLog
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@ -1,3 +1,16 @@
2003-12-04 J"orn Rennecke <joern.rennecke@superh.com>
PR optimization/13260
* sh-protos.h (sh_expand_t_scc): Declare.
* sh.h (PREDICATE_CODES): Add cmpsi_operand.
* sh.c (cmpsi_operand, sh_expand_t_scc): New functions.
* sh.md (cmpsi): Use cmpsi_operand. If T_REG is compared to
something that is not a CONST_INT, copy it into a pseudo register.
(subc): Fix description of new T value.
(slt, sgt, sge, sgtu): Don't clobber T after rtl generation is over.
(sltu, sleu, sgeu): Likewise.
(seq, sne): Likewise. Use sh_expand_t_scc.
2003-12-04 Nathanael Nerode <neroden@gcc.gnu.org>
* configure.in: Generalize the CONFIG_HEADERS pattern under which

1
gcc/config/sh/sh-protos.h
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@ -97,6 +97,7 @@ extern int sh_insn_length_adjustment (rtx);
extern int sh_can_redirect_branch (rtx, rtx);
extern void sh_expand_unop_v2sf (enum rtx_code, rtx, rtx);
extern void sh_expand_binop_v2sf (enum rtx_code, rtx, rtx, rtx);
extern int sh_expand_t_scc (enum rtx_code code, rtx target);
#ifdef TREE_CODE
extern void sh_va_start (tree, rtx);
extern rtx sh_va_arg (tree, tree);

38
gcc/config/sh/sh.c
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@ -8898,6 +8898,15 @@ sh_register_operand (rtx op, enum machine_mode mode)
return register_operand (op, mode);
}
int
cmpsi_operand (rtx op, enum machine_mode mode)
{
if (GET_CODE (op) == REG && REGNO (op) == T_REG
&& GET_MODE (op) == SImode)
return 1;
return arith_operand (op, mode);
}
static rtx emit_load_ptr (rtx, rtx);
static rtx
@ -9129,4 +9138,33 @@ sh_get_pr_initial_val (void)
return val;
}
int
sh_expand_t_scc (enum rtx_code code, rtx target)
{
rtx result = target;
HOST_WIDE_INT val;
if (GET_CODE (sh_compare_op0) != REG || REGNO (sh_compare_op0) != T_REG
|| GET_CODE (sh_compare_op1) != CONST_INT)
return 0;
if (GET_CODE (result) != REG)
result = gen_reg_rtx (SImode);
val = INTVAL (sh_compare_op1);
if ((code == EQ && val == 1) || (code == NE && val == 0))
emit_insn (gen_movt (result));
else if ((code == EQ && val == 0) || (code == NE && val == 1))
{
emit_insn (gen_rtx_CLOBBER (VOIDmode, result));
emit_insn (gen_subc (result, result, result));
emit_insn (gen_addsi3 (result, result, GEN_INT (1)));
}
else if (code == EQ || code == NE)
emit_insn (gen_move_insn (result, GEN_INT (code == NE)));
else
return 0;
if (result != target)
emit_move_insn (target, result);
return 1;
}
#include "gt-sh.h"

1
gcc/config/sh/sh.h
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@ -3145,6 +3145,7 @@ extern int rtx_equal_function_value_matters;
{"arith_reg_or_0_operand", {SUBREG, REG, CONST_INT, CONST_VECTOR}}, \
{"binary_float_operator", {PLUS, MINUS, MULT, DIV}}, \
{"binary_logical_operator", {AND, IOR, XOR}}, \
{"cmpsi_operand", {SUBREG, REG, CONST_INT}}, \
{"commutative_float_operator", {PLUS, MULT}}, \
{"equality_comparison_operator", {EQ,NE}}, \
{"extend_reg_operand", {SUBREG, REG, TRUNCATE}}, \

35
gcc/config/sh/sh.md
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@ -705,11 +705,14 @@
(define_expand "cmpsi"
[(set (reg:SI T_REG)
(compare (match_operand:SI 0 "arith_operand" "")
(compare (match_operand:SI 0 "cmpsi_operand" "")
(match_operand:SI 1 "arith_operand" "")))]
"TARGET_SH1"
"
{
if (GET_CODE (operands[0]) == REG && REGNO (operands[0]) == T_REG
&& GET_CODE (operands[1]) != CONST_INT)
operands[0] = copy_to_mode_reg (SImode, operands[0]);
sh_compare_op0 = operands[0];
sh_compare_op1 = operands[1];
DONE;
@ -1167,7 +1170,9 @@
(match_operand:SI 2 "arith_reg_operand" "r"))
(reg:SI T_REG)))
(set (reg:SI T_REG)
(gtu:SI (minus:SI (match_dup 1) (match_dup 2)) (match_dup 1)))]
(gtu:SI (minus:SI (minus:SI (match_dup 1) (match_dup 2))
(reg:SI T_REG))
(match_dup 1)))]
"TARGET_SH1"
"subc %2,%0"
[(set_attr "type" "arith")])
@ -7446,6 +7451,10 @@ mov.l\\t1f,r0\\n\\
}
DONE;
}
if (sh_expand_t_scc (EQ, operands[0]))
DONE;
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (EQ);
}")
@ -7492,6 +7501,8 @@ mov.l\\t1f,r0\\n\\
}
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (LT);
}")
@ -7594,6 +7605,8 @@ mov.l\\t1f,r0\\n\\
}
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (GT);
}")
@ -7646,6 +7659,8 @@ mov.l\\t1f,r0\\n\\
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
if (GET_MODE_CLASS (GET_MODE (sh_compare_op0)) == MODE_FLOAT)
{
if (TARGET_IEEE)
@ -7685,6 +7700,8 @@ mov.l\\t1f,r0\\n\\
sh_compare_op0, sh_compare_op1));
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (GTU);
}")
@ -7709,6 +7726,8 @@ mov.l\\t1f,r0\\n\\
sh_compare_op1, sh_compare_op0));
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (LTU);
}")
@ -7738,6 +7757,8 @@ mov.l\\t1f,r0\\n\\
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (LEU);
}")
@ -7768,6 +7789,8 @@ mov.l\\t1f,r0\\n\\
DONE;
}
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (GEU);
}")
@ -7815,8 +7838,12 @@ mov.l\\t1f,r0\\n\\
DONE;
}
operands[1] = prepare_scc_operands (EQ);
operands[2] = gen_reg_rtx (SImode);
if (sh_expand_t_scc (NE, operands[0]))
DONE;
if (! rtx_equal_function_value_matters)
FAIL;
operands[1] = prepare_scc_operands (EQ);
operands[2] = gen_reg_rtx (SImode);
}")
(define_expand "sunordered"