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aarch64.c (aarch64_select_cc_mode): Return CC_SWP for comparison with negated operand.

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[gcc/]
2013-09-09  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/aarch64/aarch64.c (aarch64_select_cc_mode): Return CC_SWP for
	comparison with negated operand.
	* config/aarch64/aarch64.md (compare_neg<mode>): Match canonical RTL form.

[gcc/testsuite/]	
2013-09-09  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* gcc.target/aarch64/cmn-neg.c: New test.

From-SVN: r202400
This commit is contained in:
Kyrylo Tkachov 2013-09-09 13:32:50 +00:00 committed by Kyrylo Tkachov
parent 467a3558ef
commit 274b253236
5 changed files with 51 additions and 7 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2013-09-09 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/aarch64/aarch64.c (aarch64_select_cc_mode): Return CC_SWP for
comparison with negated operand.
* config/aarch64/aarch64.md (compare_neg<mode>): Match canonical RTL form.
2013-09-09 Richard Biener <rguenther@suse.de>
PR middle-end/58326

5
gcc/config/aarch64/aarch64.c
View File

@ -3313,14 +3313,15 @@ aarch64_select_cc_mode (RTX_CODE code, rtx x, rtx y)
|| GET_CODE (x) == NEG))
return CC_NZmode;
/* A compare with a shifted operand. Because of canonicalization,
/* A compare with a shifted or negated operand. Because of canonicalization,
the comparison will have to be swapped when we emit the assembly
code. */
if ((GET_MODE (x) == SImode || GET_MODE (x) == DImode)
&& (GET_CODE (y) == REG || GET_CODE (y) == SUBREG)
&& (GET_CODE (x) == ASHIFT || GET_CODE (x) == ASHIFTRT
|| GET_CODE (x) == LSHIFTRT
|| GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND))
|| GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND
|| GET_CODE (x) == NEG))
return CC_SWPmode;
/* A compare of a mode narrower than SI mode against zero can be done

10
gcc/config/aarch64/aarch64.md
View File

@ -1480,12 +1480,12 @@
)
(define_insn "*compare_neg<mode>"
[(set (reg:CC CC_REGNUM)
(compare:CC
(match_operand:GPI 0 "register_operand" "r")
(neg:GPI (match_operand:GPI 1 "register_operand" "r"))))]
[(set (reg:CC_SWP CC_REGNUM)
(compare:CC_SWP
(neg:GPI (match_operand:GPI 0 "register_operand" "r"))
(match_operand:GPI 1 "register_operand" "r")))]
""
"cmn\\t%<w>0, %<w>1"
"cmn\\t%<w>1, %<w>0"
[(set_attr "v8type" "alus")
(set_attr "type" "alus_reg")
(set_attr "mode" "<MODE>")]

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2013-09-09 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* gcc.target/aarch64/cmn-neg.c: New test.
2013-09-09 Richard Biener <rguenther@suse.de>
PR middle-end/58326

33
gcc/testsuite/gcc.target/aarch64/cmn-neg.c Normal file
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@ -0,0 +1,33 @@
/* { dg-do run } */
/* { dg-options "-O2 --save-temps" } */
extern void abort (void);
void __attribute__ ((noinline))
foo_s32 (int a, int b)
{
if (a < -b)
abort ();
}
/* { dg-final { scan-assembler "cmn\tw\[0-9\]" } } */
void __attribute__ ((noinline))
foo_s64 (long long a, long long b)
{
if (a < -b)
abort ();
}
/* { dg-final { scan-assembler "cmn\tx\[0-9\]" } } */
int
main (void)
{
int a = 30;
int b = 42;
foo_s32 (a, b);
foo_s64 (a, b);
return 0;
}
/* { dg-final { cleanup-saved-temps } } */