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rs6000.c (const_load_sequence_p): Handle extra indirection for large and small code models. 

[gcc]

2015-12-01  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (const_load_sequence_p): Handle extra
	indirection for large and small code models.
	(adjust_vperm): Likewise.

[gcc/testsuite]

2015-12-01  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* gcc.target/powerpc/swaps-p8-22.c: New.

From-SVN: r231119
This commit is contained in:
Bill Schmidt 2015-12-01 16:10:45 +00:00 committed by William Schmidt
parent 37d5ad46dd
commit 3b47f4cc10
4 changed files with 55 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-12-01 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
* config/rs6000/rs6000.c (const_load_sequence_p): Handle extra
indirection for large and small code models.
(adjust_vperm): Likewise.
2015-12-01 Julian Brown <julian@codesourcery.com>
Cesar Philippidis <cesar@codesourcery.com>
James Norris <James_Norris@mentor.com>

18
gcc/config/rs6000/rs6000.c
View File

@ -36613,7 +36613,12 @@ const_load_sequence_p (swap_web_entry *insn_entry, rtx insn)
rtx base, offset;
if (GET_CODE (tocrel_body) != SET)
return false;
if (!toc_relative_expr_p (SET_SRC (tocrel_body), false))
/* There is an extra level of indirection for small/large
code models. */
rtx tocrel_expr = SET_SRC (tocrel_body);
if (GET_CODE (tocrel_expr) == MEM)
tocrel_expr = XEXP (tocrel_expr, 0);
if (!toc_relative_expr_p (tocrel_expr, false))
return false;
split_const (XVECEXP (tocrel_base, 0, 0), &base, &offset);
if (GET_CODE (base) != SYMBOL_REF || !CONSTANT_POOL_ADDRESS_P (base))
@ -37294,10 +37299,19 @@ adjust_vperm (rtx_insn *insn)
to set tocrel_base; otherwise it would be unnecessary as we've
already established it will return true. */
rtx base, offset;
if (!toc_relative_expr_p (SET_SRC (PATTERN (tocrel_insn)), false))
rtx tocrel_expr = SET_SRC (PATTERN (tocrel_insn));
/* There is an extra level of indirection for small/large code models. */
if (GET_CODE (tocrel_expr) == MEM)
tocrel_expr = XEXP (tocrel_expr, 0);
if (!toc_relative_expr_p (tocrel_expr, false))
gcc_unreachable ();
split_const (XVECEXP (tocrel_base, 0, 0), &base, &offset);
rtx const_vector = get_pool_constant (base);
/* With the extra indirection, get_pool_constant will produce the
real constant from the reg_equal expression, so get the real
constant. */
if (GET_CODE (const_vector) == SYMBOL_REF)
const_vector = get_pool_constant (const_vector);
gcc_assert (GET_CODE (const_vector) == CONST_VECTOR);
/* Create an adjusted mask from the initial mask. */

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2015-12-01 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
* gcc.target/powerpc/swaps-p8-22.c: New.
2015-12-01 Marek Polacek <polacek@redhat.com>
PR tree-optimization/67916

29
gcc/testsuite/gcc.target/powerpc/swaps-p8-22.c Normal file
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@ -0,0 +1,29 @@
/* { dg-do compile { target { powerpc64le-*-* } } } */
/* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power8" } }
/* { dg-options "-O2 -mcpu=power8 -maltivec -mcmodel=large" } */
/* The expansion for vector character multiply introduces a vperm operation.
This tests that changing the vperm mask allows us to remove all swaps
from the generated code. It is a duplicate of swaps-p8-21.c, except
that it applies the large code model, which requires an extra indirection
in the load of the constant mask. */
#include <altivec.h>
void abort ();
vector unsigned char r;
vector unsigned char v =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
vector unsigned char i =
{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
int main ()
{
int j;
r = v * i;
return 0;
}
/* { dg-final { scan-assembler-times "vperm" 1 } } */
/* { dg-final { scan-assembler-not "xxpermdi" } } */