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re PR target/87079 (nios2 optimization for size - case of regression relatively to 5.3.0)

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2018-11-03  Sandra Loosemore  <sandra@codesourcery.com>

	PR target/87079

	gcc/
	* config/nios2/nios2.c (nios2_rtx_costs): Recognize <mul>sidi3
	pattern.

	gcc/testsuite/
	* gcc.target/nios2/pr87079-1.c: New.	
	* gcc.target/nios2/pr87079-2.c: New.

From-SVN: r265770
This commit is contained in:
Sandra Loosemore 2018-11-03 14:12:44 -04:00 committed by Sandra Loosemore
parent b15ed67b3d
commit 2eae232fc5
5 changed files with 95 additions and 0 deletions
gcc
ChangeLog
config/nios2
nios2.c
testsuite
ChangeLog
gcc.target/nios2
pr87079-1.cpr87079-2.c

7
gcc/ChangeLog

@ -1,3 +1,10 @@
2018-11-03 Sandra Loosemore <sandra@codesourcery.com>
PR target/87079
* config/nios2/nios2.c (nios2_rtx_costs): Recognize <mul>sidi3
pattern.
2018-11-02 Aaron Sawdey <acsawdey@linux.ibm.com>
* config/rs6000/rs6000-string.c (expand_strncmp_gpr_sequence): Pay

13
gcc/config/nios2/nios2.c

@ -1539,6 +1539,19 @@ nios2_rtx_costs (rtx x, machine_mode mode,
*total = COSTS_N_INSNS (2); /* Latency adjustment. */
else
*total = COSTS_N_INSNS (1);
if (TARGET_HAS_MULX && GET_MODE (x) == DImode)
{
enum rtx_code c0 = GET_CODE (XEXP (x, 0));
enum rtx_code c1 = GET_CODE (XEXP (x, 1));
if ((c0 == SIGN_EXTEND && c1 == SIGN_EXTEND)
|| (c0 == ZERO_EXTEND && c1 == ZERO_EXTEND))
/* This is the <mul>sidi3 pattern, which expands into 4 insns,
2 multiplies and 2 moves. */
{
*total = *total * 2 + COSTS_N_INSNS (2);
return true;
}
}
return false;
}

7
gcc/testsuite/ChangeLog

@ -1,3 +1,10 @@
2018-11-03 Sandra Loosemore <sandra@codesourcery.com>
PR target/87079
* gcc.target/nios2/pr87079-1.c: New.
* gcc.target/nios2/pr87079-2.c: New.
2018-11-02 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* gcc.dg/compat/pr83487-1_y.c: Move dg-skip-if ...

34
gcc/testsuite/gcc.target/nios2/pr87079-1.c Normal file

@ -0,0 +1,34 @@
/* { dg-do compile } */
/* { dg-options "-Os -mhw-div -mhw-mul -mhw-mulx" } */
#include <stdint.h>
#include <stddef.h>
void foo(const uint8_t* str, uint32_t* res)
{
uint32_t rdVal0, rdVal1, rdVal2;
rdVal0 = rdVal1 = rdVal2 = 0;
unsigned c;
for (;;) {
c = *str++;
unsigned dig = c - '0';
if (dig > 9)
break; // non-digit
uint64_t x10;
x10 = (uint64_t)rdVal0*10 + dig;
rdVal0 = (uint32_t)x10;
dig = (uint32_t)(x10 >> 32);
x10 = (uint64_t)rdVal1*10 + dig;
rdVal1 = (uint32_t)x10;
dig = (uint32_t)(x10 >> 32);
rdVal2 = rdVal2*10 + dig;
}
res[0] = rdVal0;
res[1] = rdVal1;
res[2] = rdVal2;
}
/* { dg-final { scan-assembler-times "mulxuu\t" 2 } } */

34
gcc/testsuite/gcc.target/nios2/pr87079-2.c Normal file

@ -0,0 +1,34 @@
/* { dg-do compile } */
/* { dg-options "-O2 -mhw-div -mhw-mul -mhw-mulx" } */
#include <stdint.h>
#include <stddef.h>
void foo(const uint8_t* str, uint32_t* res)
{
uint32_t rdVal0, rdVal1, rdVal2;
rdVal0 = rdVal1 = rdVal2 = 0;
unsigned c;
for (;;) {
c = *str++;
unsigned dig = c - '0';
if (dig > 9)
break; // non-digit
uint64_t x10;
x10 = (uint64_t)rdVal0*10 + dig;
rdVal0 = (uint32_t)x10;
dig = (uint32_t)(x10 >> 32);
x10 = (uint64_t)rdVal1*10 + dig;
rdVal1 = (uint32_t)x10;
dig = (uint32_t)(x10 >> 32);
rdVal2 = rdVal2*10 + dig;
}
res[0] = rdVal0;
res[1] = rdVal1;
res[2] = rdVal2;
}
/* { dg-final { scan-assembler-times "mulxuu\t" 2 } } */