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re PR rtl-optimization/69806 ([SH] Combine doesn't see constant) 

gcc/
	PR target/69806
	PR target/54089
	* config/sh/sh.c (sh_lshrsi_clobbers_t_reg_p, sh_dynamicalize_shift_p):
	Handle negative shift counts.
	* config/sh/sh.md (ashlsi3, lshrsi3_n, lshrsi3_n_clobbers_t): Don't use
	force_reg on the shift constant.
	(lshrsi3): Likewise.  Expand into lshrsi3_n* instead of lshrsi3_d.
	(lshrsi3_d): Handle negative shift counts.

gcc/testsuite/
	PR target/69806
	PR target/54089
	* gcc.target/sh/pr54089-10.c: New.

From-SVN: r233601
This commit is contained in:
Oleg Endo 2016-02-22 13:33:31 +00:00
parent bddb7adb44
commit f88d45dc17
5 changed files with 190 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gcc/ChangeLog
View File

@ -1,3 +1,14 @@
2016-02-22 Oleg Endo <olegendo@gcc.gnu.org>
PR target/69806
PR target/54089
* config/sh/sh.c (sh_lshrsi_clobbers_t_reg_p, sh_dynamicalize_shift_p):
Handle negative shift counts.
* config/sh/sh.md (ashlsi3, lshrsi3_n, lshrsi3_n_clobbers_t): Don't use
force_reg on the shift constant.
(lshrsi3): Likewise. Expand into lshrsi3_n* instead of lshrsi3_d.
(lshrsi3_d): Handle negative shift counts.
2016-02-22 Richard Biener <rguenther@suse.de>
Tom de Vries <tom@codesourcery.com>

6
gcc/config/sh/sh.c
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@ -3259,7 +3259,8 @@ sh_lshrsi_clobbers_t_reg_p (rtx shift_amount)
{
gcc_assert (CONST_INT_P (shift_amount));
const int shift_amount_i = INTVAL (shift_amount) & 31;
/* For right shifts the constant might be negative. */
const int shift_amount_i = std::abs (INTVAL (shift_amount)) & 31;
/* Special case for shift count of 31: use shll-movt sequence. */
if (shift_amount_i == 31)
@ -3278,7 +3279,8 @@ sh_dynamicalize_shift_p (rtx count)
{
gcc_assert (CONST_INT_P (count));
const int shift_amount_i = INTVAL (count) & 31;
/* For right shifts the constant might be negative. */
const int shift_amount_i = std::abs (INTVAL (count)) & 31;
int insn_count;
/* For left and right shifts, there are shorter 2 insn sequences for

24
gcc/config/sh/sh.md
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@ -5011,7 +5011,10 @@ label:
}
if (TARGET_DYNSHIFT
&& CONST_INT_P (operands[2]) && sh_dynamicalize_shift_p (operands[2]))
operands[2] = force_reg (SImode, operands[2]);
{
/* Don't force the constant into a reg yet. Some other optimizations
might not see through the reg that holds the shift count. */
}
/* If the ashlsi3_* insn is going to clobber the T_REG it must be
expanded here. */
@ -5567,9 +5570,12 @@ label:
if (TARGET_DYNSHIFT
&& CONST_INT_P (operands[2]) && sh_dynamicalize_shift_p (operands[2]))
{
rtx neg_count = force_reg (SImode,
gen_int_mode (- INTVAL (operands[2]), SImode));
emit_insn (gen_lshrsi3_d (operands[0], operands[1], neg_count));
/* Don't force the constant into a reg yet. Some other optimizations
might not see through the reg that holds the shift count. */
if (sh_lshrsi_clobbers_t_reg_p (operands[2]))
emit_insn (gen_lshrsi3_n_clobbers_t (operands[0], operands[1], operands[2]));
else
emit_insn (gen_lshrsi3_n (operands[0], operands[1], operands[2]));
DONE;
}
@ -5621,6 +5627,10 @@ label:
&& ! sh_lshrsi_clobbers_t_reg_p (operands[2])"
[(const_int 0)]
{
/* The shift count const_int is a negative value for all dynamic
right shift insns. */
operands[2] = GEN_INT (- INTVAL (operands[2]));
if (satisfies_constraint_P27 (operands[2]))
{
/* This will not be done for a shift amount of 1, because it would
@ -5679,8 +5689,7 @@ label:
{
/* If this pattern was picked and dynamic shifts are supported, switch
to dynamic shift pattern before reload. */
operands[2] = force_reg (SImode,
gen_int_mode (- INTVAL (operands[2]), SImode));
operands[2] = GEN_INT (- INTVAL (operands[2]));
emit_insn (gen_lshrsi3_d (operands[0], operands[1], operands[2]));
}
else
@ -5711,8 +5720,7 @@ label:
{
/* If this pattern was picked and dynamic shifts are supported, switch
to dynamic shift pattern before reload. */
operands[2] = force_reg (SImode,
gen_int_mode (- INTVAL (operands[2]), SImode));
operands[2] = GEN_INT (- INTVAL (operands[2]));
emit_insn (gen_lshrsi3_d (operands[0], operands[1], operands[2]));
}
else

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2016-02-22 Oleg Endo <olegendo@gcc.gnu.org>
PR target/69806
PR target/54089
* gcc.target/sh/pr54089-10.c: New.
2016-02-20 Paul Thomas <pault@gcc.gnu.org>
PR fortran/69423

153
gcc/testsuite/gcc.target/sh/pr54089-10.c Normal file
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@ -0,0 +1,153 @@
/* Check that there are no redundant zero extensions around logical right
shifts. */
/* { dg-do compile } */
/* { dg-options "-O1" } */
/* { dg-final { scan-assembler-times "extu" 20 } } */
/* { dg-final { scan-assembler-times "shll" 2 { target { "! sh2a" && has_dyn_shift } } } } */
/* { dg-final { scan-assembler-times "shll" 3 { target { "! sh2a" && "! has_dyn_shift" } } } } */
/* { dg-final { scan-assembler-times "movt" 2 { target { ! sh2a } } } } */
/* { dg-final { scan-assembler-times "bld" 1 { target { sh2a } } } } */
/* { dg-final { scan-assembler-times "movt" 1 { target { sh2a } } } } */
/* { dg-final { scan-assembler-times "movrt" 1 { target { sh2a } } } } */
/* { dg-final { scan-assembler-times "cmp/pz" 1 { target { sh2a } } } } */
/* { dg-final { scan-assembler-times "shld" 9 { target { has_dyn_shift } } } } */
void
test_0 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 1;
}
void
test_1 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 2;
}
void
test_2 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 3;
}
void
test_3 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 4;
}
void
test_4 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 5;
}
void
test_5 (unsigned char* x, unsigned int* y)
{
y[0] = x[1] >> 6;
}
void
test_6 (unsigned char* x, unsigned int* y)
{
/* non-SH2A: shll, movt
SH2A: bld, movt */
y[0] = x[1] >> 7;
}
void
test_100 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 1;
}
void
test_101 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 2;
}
void
test_102 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 3;
}
void
test_103 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 4;
}
void
test_104 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 5;
}
void
test_105 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 6;
}
void
test_106 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 7;
}
void
test_107 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 8;
}
void
test_108 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 9;
}
void
test_109 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 10;
}
void
test_110 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 11;
}
void
test_111 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 12;
}
void
test_112 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 13;
}
void
test_113 (unsigned short* x, unsigned int* y)
{
y[0] = x[1] >> 14;
}
void
test_114 (unsigned short* x, unsigned int* y)
{
/* non-SH2A: shll, movt
SH2A: cmp/pz, movrt */
y[0] = x[1] >> 15;
}