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Commit 465e2716 by Geoff Keating Committed by Geoffrey Keating
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rs6000.c (num_insns_constant_wide): Correct for type promotion. 

	* config/rs6000/rs6000.c (num_insns_constant_wide): Correct
	for type promotion.
	(add_operand): Get test correct for 64-bit HOST_WIDE_INT.
	(non_add_cint_operand): Likewise.
	(logical_operand): Likewise.
	(non_logical_cint_operand): Likewise.
	(print_operand): Correct printf()s for 64-bit HOST_WIDE_INT.
	(print_operand_address): Correct printf() for 64-bit HOST_WIDE_INT.
	(rs6000_select_rtx_section): Suppress warning.
	(small_data_operand): Suppress warning.
	(rs6000_got_register): Suppress warning.
	* config/rs6000/rs6000.md (andsi3): HOST_WIDE_INT is a signed
	type, so `J' is generally the wrong constraint for a SImode value;
	use `L' instead.
	(andsi3_internal2): Likewise.
	(andsi3_internal3): Likewise.
	(iorsi3_internal1): Likewise.
	(xorsi3_internal1): Likewise.
	(movsi): Likewise.
	(movsf_softfloat): Likewise.
	various unnamed compare insns: Likewise.
	(movsi+2): Preserve sign bits of SImode constant.
	(floatsidf2_internal+1): Sign-extend SImode constant correctly.
	(movdf+1): Preserve high bits of DFmode constant.
	(movdi_32+1): Sign-extend properly.
	various unnamed compare insns: Sign-extend properly.

	* unroll.c (loop_iterations): Convert HOST_WIDE_INT to unsigned
	properly for mode.
	* expmed.c (expand_mult_highpart): Convert HOST_WIDE_INT from unsigned
	properly for mode.
	(expand_divmod): Likewise.
	* optabs.c (expand_fix): Keep HOST_WIDE_INT constants properly signed.
	(expand_binop): Sometimes there is work to do when changing
	the mode of a CONST_INT.

From-SVN: r28375
parent 3f1d071b
Showing with 111 additions and 56 deletions
gcc/ChangeLog
Sun Jul 25 19:32:58 1999 Geoff Keating <geoffk@cygnus.com>
* config/rs6000/rs6000.c (num_insns_constant_wide): Correct
for type promotion.
(add_operand): Get test correct for 64-bit HOST_WIDE_INT.
(non_add_cint_operand): Likewise.
(logical_operand): Likewise.
(non_logical_cint_operand): Likewise.
(print_operand): Correct printf()s for 64-bit HOST_WIDE_INT.
(print_operand_address): Correct printf() for 64-bit HOST_WIDE_INT.
(rs6000_select_rtx_section): Suppress warning.
(small_data_operand): Suppress warning.
(rs6000_got_register): Suppress warning.
* config/rs6000/rs6000.md (andsi3): HOST_WIDE_INT is a signed
type, so `J' is generally the wrong constraint for a SImode value;
use `L' instead.
(andsi3_internal2): Likewise.
(andsi3_internal3): Likewise.
(iorsi3_internal1): Likewise.
(xorsi3_internal1): Likewise.
(movsi): Likewise.
(movsf_softfloat): Likewise.
various unnamed compare insns: Likewise.
(movsi+2): Preserve sign bits of SImode constant.
(floatsidf2_internal+1): Sign-extend SImode constant correctly.
(movdf+1): Preserve high bits of DFmode constant.
(movdi_32+1): Sign-extend properly.
various unnamed compare insns: Sign-extend properly.
* unroll.c (loop_iterations): Convert HOST_WIDE_INT to unsigned
properly for mode.
* expmed.c (expand_mult_highpart): Convert HOST_WIDE_INT from unsigned
properly for mode.
(expand_divmod): Likewise.
* optabs.c (expand_fix): Keep HOST_WIDE_INT constants properly signed.
(expand_binop): Sometimes there is work to do when changing
the mode of a CONST_INT.
Sun Aug 1 12:55:31 1999 Bernd Schmidt <bernds@cygnus.co.uk>
* stmt.c (emit_filename, emit_lineno, expr_stmts_for_value,
......
gcc/config/rs6000/rs6000.c
......@@ -666,16 +666,11 @@ num_insns_constant_wide (value)
if (((unsigned HOST_WIDE_INT)value + 0x8000) < 0x10000)
return 1;
#if HOST_BITS_PER_WIDE_INT == 32
/* constant loadable with {cau|addis} */
else if ((value & 0xffff) == 0)
return 1;
#else
/* constant loadable with {cau|addis} */
else if ((value & 0xffff) == 0 && (value & ~0xffffffff) == 0)
else if (CONST_OK_FOR_LETTER_P (value, 'L'))
return 1;
#if HOST_BITS_PER_WIDE_INT == 64
else if (TARGET_64BIT)
{
HOST_WIDE_INT low = value & 0xffffffff;
......@@ -880,7 +875,7 @@ mem_or_easy_const_operand (op, mode)
}
/* Return 1 if the operand is either a non-special register or an item
that can be used as the operand of an SI add insn. */
that can be used as the operand of a `mode' add insn. */
int
add_operand (op, mode)
......@@ -889,7 +884,7 @@ add_operand (op, mode)
{
return (reg_or_short_operand (op, mode)
|| (GET_CODE (op) == CONST_INT
&& (INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff0000)) == 0));
&& CONST_OK_FOR_LETTER_P (INTVAL(op), 'L')));
}
/* Return 1 if OP is a constant but not a valid add_operand. */
......@@ -901,7 +896,7 @@ non_add_cint_operand (op, mode)
{
return (GET_CODE (op) == CONST_INT
&& (unsigned HOST_WIDE_INT) (INTVAL (op) + 0x8000) >= 0x10000
&& (INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff0000)) != 0);
&& ! CONST_OK_FOR_LETTER_P (INTVAL(op), 'L'));
}
/* Return 1 if the operand is a non-special register or a constant that
......@@ -914,8 +909,10 @@ logical_operand (op, mode)
{
return (gpc_reg_operand (op, mode)
|| (GET_CODE (op) == CONST_INT
&& ((INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff)) == 0
|| (INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff0000)) == 0)));
&& ((INTVAL (op) & GET_MODE_MASK (mode)
& (~ (HOST_WIDE_INT) 0xffff)) == 0
|| (INTVAL (op) & GET_MODE_MASK (mode)
& (~ (HOST_WIDE_INT) 0xffff0000)) == 0)));
}
/* Return 1 if C is a constant that is not a logical operand (as
......@@ -924,11 +921,13 @@ logical_operand (op, mode)
int
non_logical_cint_operand (op, mode)
register rtx op;
enum machine_mode mode ATTRIBUTE_UNUSED;
enum machine_mode mode;
{
return (GET_CODE (op) == CONST_INT
&& (INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff)) != 0
&& (INTVAL (op) & (~ (HOST_WIDE_INT) 0xffff0000)) != 0);
&& (INTVAL (op) & GET_MODE_MASK (mode) &
(~ (HOST_WIDE_INT) 0xffff)) != 0
&& (INTVAL (op) & GET_MODE_MASK (mode) &
(~ (HOST_WIDE_INT) 0xffff0000)) != 0);
}
/* Return 1 if C is a constant that can be encoded in a 32-bit mask on the
......@@ -1198,7 +1197,7 @@ small_data_operand (op, mode)
enum machine_mode mode ATTRIBUTE_UNUSED;
{
#if TARGET_ELF
rtx sym_ref, const_part;
rtx sym_ref;
if (rs6000_sdata == SDATA_NONE || rs6000_sdata == SDATA_DATA)
return 0;
......@@ -2474,7 +2473,7 @@ ccr_bit (op, scc_p)
struct rtx_def *
rs6000_got_register (value)
rtx value;
rtx value ATTRIBUTE_UNUSED;
{
/* The second flow pass currently (June 1999) can't update regs_ever_live
without disturbing other parts of the compiler, so update it here to
......@@ -2627,7 +2626,7 @@ print_operand (file, x, code)
if (! INT_P (x))
output_operand_lossage ("invalid %%b value");
fprintf (file, "%d", INT_LOWPART (x) & 0xffff);
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INT_LOWPART (x) & 0xffff);
return;
case 'B':
......@@ -2713,7 +2712,7 @@ print_operand (file, x, code)
/* If constant, output low-order five bits. Otherwise,
write normally. */
if (INT_P (x))
fprintf (file, "%d", INT_LOWPART (x) & 31);
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INT_LOWPART (x) & 31);
else
print_operand (file, x, 0);
return;
......@@ -2722,7 +2721,7 @@ print_operand (file, x, code)
/* If constant, output low-order six bits. Otherwise,
write normally. */
if (INT_P (x))
fprintf (file, "%d", INT_LOWPART (x) & 63);
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INT_LOWPART (x) & 63);
else
print_operand (file, x, 0);
return;
......@@ -2759,7 +2758,7 @@ print_operand (file, x, code)
if (! INT_P (x))
output_operand_lossage ("invalid %%k value");
fprintf (file, "%d", ~ INT_LOWPART (x));
fprintf (file, HOST_WIDE_INT_PRINT_DEC, ~ INT_LOWPART (x));
return;
case 'L':
......@@ -2903,7 +2902,7 @@ print_operand (file, x, code)
if (! INT_P (x))
output_operand_lossage ("invalid %%s value");
fprintf (file, "%d", (32 - INT_LOWPART (x)) & 31);
fprintf (file, HOST_WIDE_INT_PRINT_DEC, (32 - INT_LOWPART (x)) & 31);
return;
case 'S':
......@@ -3006,7 +3005,8 @@ print_operand (file, x, code)
if (! INT_P (x))
output_operand_lossage ("invalid %%u value");
fprintf (file, "0x%x", (INT_LOWPART (x) >> 16) & 0xffff);
fprintf (file, HOST_WIDE_INT_PRINT_HEX,
(INT_LOWPART (x) >> 16) & 0xffff);
return;
case 'v':
......@@ -3076,7 +3076,8 @@ print_operand (file, x, code)
/* If constant, low-order 16 bits of constant, signed. Otherwise, write
normally. */
if (INT_P (x))
fprintf (file, "%d", ((INT_LOWPART (x) & 0xffff) ^ 0x8000) - 0x8000);
fprintf (file, HOST_WIDE_INT_PRINT_DEC,
((INT_LOWPART (x) & 0xffff) ^ 0x8000) - 0x8000);
else
print_operand (file, x, 0);
return;
......@@ -3085,7 +3086,7 @@ print_operand (file, x, code)
/* If constant, low-order 16 bits of constant, unsigned.
Otherwise, write normally. */
if (INT_P (x))
fprintf (file, "%d", INT_LOWPART (x) & 0xffff);
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INT_LOWPART (x) & 0xffff);
else
print_operand (file, x, 0);
return;
......@@ -3221,7 +3222,10 @@ print_operand_address (file, x)
reg_names[ REGNO (XEXP (x, 1)) ]);
}
else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == CONST_INT)
fprintf (file, "%d(%s)", INTVAL (XEXP (x, 1)), reg_names[ REGNO (XEXP (x, 0)) ]);
{
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (XEXP (x, 1)));
fprintf (file, "(%s)", reg_names[ REGNO (XEXP (x, 0)) ]);
}
#if TARGET_ELF
else if (GET_CODE (x) == LO_SUM && GET_CODE (XEXP (x, 0)) == REG
&& CONSTANT_P (XEXP (x, 1)))
......@@ -5649,7 +5653,7 @@ rs6000_longcall_ref (call_ref)
void
rs6000_select_rtx_section (mode, x)
enum machine_mode mode;
enum machine_mode mode ATTRIBUTE_UNUSED;
rtx x;
{
if (ASM_OUTPUT_SPECIAL_POOL_ENTRY_P (x))
......
gcc/config/rs6000/rs6000.md
......@@ -1938,7 +1938,7 @@
(define_insn "andsi3"
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r")
(and:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r")
(match_operand:SI 2 "and_operand" "?r,T,K,J")))
(match_operand:SI 2 "and_operand" "?r,T,K,L")))
(clobber (match_scratch:CC 3 "=X,X,x,x"))]
""
"@
......@@ -1955,7 +1955,7 @@
(define_insn "*andsi3_internal2"
[(set (match_operand:CC 0 "cc_reg_operand" "=x,x,x,x,?y,??y,??y,?y")
(compare:CC (and:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r,r,r,r")
(match_operand:SI 2 "and_operand" "r,K,J,T,r,K,J,T"))
(match_operand:SI 2 "and_operand" "r,K,L,T,r,K,L,T"))
(const_int 0)))
(clobber (match_scratch:SI 3 "=r,r,r,r,r,r,r,r"))
(clobber (match_scratch:CC 4 "=X,X,X,X,X,x,x,X"))]
......@@ -1992,7 +1992,7 @@
(define_insn "*andsi3_internal3"
[(set (match_operand:CC 3 "cc_reg_operand" "=x,x,x,x,?y,??y,??y,?y")
(compare:CC (and:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r,r,r,r")
(match_operand:SI 2 "and_operand" "r,K,J,T,r,K,J,T"))
(match_operand:SI 2 "and_operand" "r,K,L,T,r,K,L,T"))
(const_int 0)))
(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r,r,r,r")
(and:SI (match_dup 1)
......@@ -2054,7 +2054,7 @@
(define_insn "*iorsi3_internal1"
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r")
(ior:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r")
(match_operand:SI 2 "logical_operand" "r,K,J")))]
(match_operand:SI 2 "logical_operand" "r,K,L")))]
""
"@
or %0,%1,%2
......@@ -2161,7 +2161,7 @@
(define_insn "*xorsi3_internal1"
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r")
(xor:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r")
(match_operand:SI 2 "logical_operand" "r,K,J")))]
(match_operand:SI 2 "logical_operand" "r,K,L")))]
""
"@
xor %0,%1,%2
......@@ -4226,7 +4226,7 @@
(match_dup 3)))]
"
{
operands[6] = GEN_INT (0x80000000);
operands[6] = GEN_INT (~ (HOST_WIDE_INT) 0x7fffffff);
operands[7] = gen_rtx_REG (DFmode, FPMEM_REGNUM);
}")
......@@ -6127,7 +6127,7 @@
(match_dup 3)))]
"
{
operands[2] = GEN_INT (INTVAL (operands[1]) & 0xffff0000);
operands[2] = GEN_INT (INTVAL (operands[1]) & (~ (HOST_WIDE_INT) 0xffff));
operands[3] = GEN_INT (INTVAL (operands[1]) & 0xffff);
}")
......@@ -6383,7 +6383,7 @@
int endian = (WORDS_BIG_ENDIAN == 0);
operands[2] = operand_subword (operands[0], endian, 0, DFmode);
operands[3] = operand_subword (operands[0], 1 - endian, 0, DFmode);
operands[4] = (INTVAL (operands[1]) & 0x80000000) ? constm1_rtx : const0_rtx;
operands[4] = GEN_INT(INTVAL (operands[1]) >> 31 >> 1);
}")
(define_split
......@@ -6740,13 +6740,14 @@
(set (match_dup 3) (match_dup 1))]
"
{
HOST_WIDE_INT value = INTVAL (operands[1]);
operands[2] = gen_rtx_SUBREG (SImode, operands[0], WORDS_BIG_ENDIAN == 0);
operands[3] = gen_rtx_SUBREG (SImode, operands[0], WORDS_BIG_ENDIAN != 0);
#if HOST_BITS_PER_WIDE_INT == 32
operands[4] = (INTVAL (operands[1]) & 0x80000000) ? constm1_rtx : const0_rtx;
operands[4] = (value & 0x80000000) ? constm1_rtx : const0_rtx;
#else
operands[4] = GEN_INT ((HOST_WIDE_INT) INTVAL (operands[1]) >> 32);
operands[1] = GEN_INT (INTVAL (operands[1]) & 0xffffffff);
operands[4] = GEN_INT (value >> 32);
operands[1] = GEN_INT ((value & 0x7fffffff) - (value & 0x80000000));
#endif
}")
......@@ -8893,9 +8894,9 @@
sign-extended to 16 bits. Then see what constant could be XOR'ed
with C to get the sign-extended value. */
int c = INTVAL (operands[2]);
int sextc = (c << 16) >> 16;
int xorv = c ^ sextc;
HOST_WIDE_INT c = INTVAL (operands[2]);
HOST_WIDE_INT sextc = (c & 0x7fff) - (c & 0x8000);
HOST_WIDE_INT xorv = c ^ sextc;
operands[4] = GEN_INT (xorv);
operands[5] = GEN_INT (sextc);
......@@ -9128,7 +9129,7 @@
(define_insn ""
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r")
(eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I")))
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I")))
(clobber (match_scratch:SI 3 "=r,&r,r,r,r"))]
""
"@
......@@ -9157,7 +9158,7 @@
[(set (match_operand:CC 4 "cc_reg_operand" "=x,x,x,x,x")
(compare:CC
(eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I"))
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I"))
(const_int 0)))
(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r")
(eq:SI (match_dup 1) (match_dup 2)))
......@@ -9209,7 +9210,7 @@
(define_insn ""
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r")
(plus:SI (eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I"))
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I"))
(match_operand:SI 3 "gpc_reg_operand" "r,r,r,r,r")))
(clobber (match_scratch:SI 4 "=&r,&r,&r,&r,&r"))]
""
......@@ -9226,7 +9227,7 @@
(compare:CC
(plus:SI
(eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I"))
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I"))
(match_operand:SI 3 "gpc_reg_operand" "r,r,r,r,r"))
(const_int 0)))
(clobber (match_scratch:SI 4 "=&r,&r,&r,&r,&r"))]
......@@ -9245,7 +9246,7 @@
(compare:CC
(plus:SI
(eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I"))
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I"))
(match_operand:SI 3 "gpc_reg_operand" "r,r,r,r,r"))
(const_int 0)))
(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r")
......@@ -9264,7 +9265,7 @@
(define_insn ""
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r,r,r,r")
(neg:SI (eq:SI (match_operand:SI 1 "gpc_reg_operand" "%r,r,r,r,r")
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,J,I"))))]
(match_operand:SI 2 "reg_or_cint_operand" "r,O,K,L,I"))))]
""
"@
xor %0,%1,%2\;{ai|addic} %0,%0,-1\;{sfe|subfe} %0,%0,%0
......
gcc/expmed.c
......@@ -2718,13 +2718,13 @@ expand_mult_highpart (mode, op0, cnst1, target, unsignedp, max_cost)
int size = GET_MODE_BITSIZE (mode);
rtx op1, wide_op1;
/* We can't support modes wider than HOST_BITS_PER_INT. */
/* We can't support modes wider than HOST_BITS_PER_WIDE_INT. */
if (size > HOST_BITS_PER_WIDE_INT)
abort ();
op1 = GEN_INT (cnst1);
op1 = GEN_INT (cnst1 | -(cnst1 & ((HOST_WIDE_INT) 1 << (size - 1))));
if (GET_MODE_BITSIZE (wider_mode) <= HOST_BITS_PER_INT)
if (GET_MODE_BITSIZE (wider_mode) <= HOST_BITS_PER_WIDE_INT)
wide_op1 = op1;
else
wide_op1
......@@ -3726,6 +3726,8 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
post_shift = floor_log2 (d & -d);
ml = invert_mod2n (d >> post_shift, size);
/* Sign-extend ml for compute_mode. */
ml |= -(ml & (1 << (GET_MODE_BITSIZE (compute_mode)-1)));
t1 = expand_mult (compute_mode, op0, GEN_INT (ml), NULL_RTX,
unsignedp);
quotient = expand_shift (RSHIFT_EXPR, compute_mode, t1,
......
gcc/md.texi
......@@ -1384,13 +1384,14 @@ Floating point register
Signed 16 bit constant
@item J
Constant whose low 16 bits are 0
Unsigned 16 bit constant shifted left 16 bits (use @samp{L} instead for
@code{SImode} constants)
@item K
Constant whose high 16 bits are 0
Unsigned 16 bit constant
@item L
Constant suitable as a mask operand
Signed 16 bit constant shifted left 16 bits
@item M
Constant larger than 31
......@@ -1418,6 +1419,9 @@ AIX TOC entry
@item S
Constant suitable as a 64-bit mask operand
@item T
Constant suitable as a 32-bit mask operand
@item U
System V Release 4 small data area reference
@end table
......
gcc/optabs.c
......@@ -857,12 +857,12 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
/* In case the insn wants input operands in modes different from
the result, convert the operands. */
if (GET_MODE (op0) != VOIDmode
if ((GET_MODE (op0) != VOIDmode || GET_CODE (op0) == CONST_INT)
&& GET_MODE (op0) != mode0
&& mode0 != VOIDmode)
xop0 = convert_to_mode (mode0, xop0, unsignedp);
if (GET_MODE (xop1) != VOIDmode
if ((GET_MODE (xop1) != VOIDmode || GET_CODE (xop1) == CONST_INT)
&& GET_MODE (xop1) != mode1
&& mode1 != VOIDmode)
xop1 = convert_to_mode (mode1, xop1, unsignedp);
......@@ -4231,7 +4231,7 @@ expand_fix (to, from, unsignedp)
NULL_RTX, 0, OPTAB_LIB_WIDEN);
expand_fix (to, target, 0);
target = expand_binop (GET_MODE (to), xor_optab, to,
GEN_INT ((HOST_WIDE_INT) 1 << (bitsize - 1)),
GEN_INT ((HOST_WIDE_INT) -1 << (bitsize - 1)),
to, 1, OPTAB_LIB_WIDEN);
if (target != to)
......
gcc/unroll.c
......@@ -3588,6 +3588,7 @@ loop_iterations (loop_start, loop_end, loop_info)
rtx comparison, comparison_value;
rtx iteration_var, initial_value, increment, final_value;
enum rtx_code comparison_code;
enum machine_mode comparison_mode;
HOST_WIDE_INT abs_inc;
unsigned HOST_WIDE_INT abs_diff;
int off_by_one;
......@@ -3652,6 +3653,7 @@ loop_iterations (loop_start, loop_end, loop_info)
invariant register when it canonicalizes the comparison. */
comparison_code = GET_CODE (comparison);
comparison_mode = GET_MODE (comparison);
iteration_var = XEXP (comparison, 0);
comparison_value = XEXP (comparison, 1);
......@@ -3991,6 +3993,10 @@ loop_iterations (loop_start, loop_end, loop_info)
else
abort ();
/* It may be that comparison_mode is smaller than a HOST_WIDE_INT,
for instance on a 64-bit host when comparison_mode is SImode. */
abs_diff &= GET_MODE_MASK (comparison_mode);
/* For NE tests, make sure that the iteration variable won't miss
the final value. If abs_diff mod abs_incr is not zero, then the
iteration variable will overflow before the loop exits, and we
......
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