* [PATCH][AArch64][2/3] Implement negcc, notcc optabs
@ 2015-09-01 15:04 Kyrill Tkachov
2015-09-10 8:50 ` James Greenhalgh
0 siblings, 1 reply; 2+ messages in thread
From: Kyrill Tkachov @ 2015-09-01 15:04 UTC (permalink / raw)
To: GCC Patches; +Cc: Marcus Shawcroft, Richard Earnshaw, James Greenhalgh
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Hi all,
This second patch implements the new optabs for aarch64.
The new expander is almost identical to the mov<mode>cc expander
except that operand 2 has a neg or a not before it to reflect the
fact that it should be negated if the comparison in operand 1 holds.
These patterns will eventually match to the CSNEG and CSINV instructions.
The test included shows the kind of code that triggers this.
We will now create a single immediate move followed by a CSNEG (or CSINV)
rather than performing two immediate moves followed by a CSEL.
Bootstrapped and tested on aarch64-none-linux-gnu.
Ok for trunk if the midend changes in 1/3 are approved?
Thanks,
Kyrill
2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/aarch64/aarch64.md (<neg_not_op><mode>cc): New define_expand.
* config/aarch64/iterators.md (NEG_NOT): New code iterator.
(neg_not_op): New code attribute.
2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* gcc.target/aarch64/cond_op_imm_1.c: New test.
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commit 771d788b184d466d1ea9fad87ab200601421f8c0
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Mon Jul 27 15:02:38 2015 +0100
[AArch64][2/3] Implement negcc, notcc optabs
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index c3b985b..77bc7cd 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -3038,6 +3038,24 @@ (define_expand "mov<mode>cc"
}
)
+(define_expand "<neg_not_op><mode>cc"
+ [(set (match_operand:GPI 0 "register_operand" "")
+ (if_then_else:GPI (match_operand 1 "aarch64_comparison_operator" "")
+ (NEG_NOT:GPI (match_operand:GPI 2 "register_operand" ""))
+ (match_operand:GPI 3 "register_operand" "")))]
+ ""
+ {
+ rtx ccreg;
+ enum rtx_code code = GET_CODE (operands[1]);
+
+ if (code == UNEQ || code == LTGT)
+ FAIL;
+
+ ccreg = aarch64_gen_compare_reg (code, XEXP (operands[1], 0),
+ XEXP (operands[1], 1));
+ operands[1] = gen_rtx_fmt_ee (code, VOIDmode, ccreg, const0_rtx);
+ }
+)
;; CRC32 instructions.
(define_insn "aarch64_<crc_variant>"
diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md
index b8a45d1..64f5ade 100644
--- a/gcc/config/aarch64/iterators.md
+++ b/gcc/config/aarch64/iterators.md
@@ -668,6 +668,9 @@ (define_code_iterator LOGICAL [and ior xor])
;; Code iterator for logical operations whose :nlogical works on SIMD registers.
(define_code_iterator NLOGICAL [and ior])
+;; Code iterator for unary negate and bitwise complement.
+(define_code_iterator NEG_NOT [neg not])
+
;; Code iterator for sign/zero extension
(define_code_iterator ANY_EXTEND [sign_extend zero_extend])
@@ -797,6 +800,9 @@ (define_code_attr bfshift [(ashift "ubfiz") (ashiftrt "sbfx")
;; Logical operator instruction mnemonics
(define_code_attr logical [(and "and") (ior "orr") (xor "eor")])
+;; Operation names for negate and bitwise complement.
+(define_code_attr neg_not_op [(neg "neg") (not "not")])
+
;; Similar, but when not(op)
(define_code_attr nlogical [(and "bic") (ior "orn") (xor "eon")])
diff --git a/gcc/testsuite/gcc.target/aarch64/cond_op_imm_1.c b/gcc/testsuite/gcc.target/aarch64/cond_op_imm_1.c
new file mode 100644
index 0000000..e93a693
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/cond_op_imm_1.c
@@ -0,0 +1,99 @@
+/* { dg-do run } */
+/* { dg-options "-save-temps -O2 -fno-inline" } */
+
+extern void abort (void);
+
+#define N 30
+#define M 25089992
+
+int
+foonegsi (int a)
+{
+ return a ? N : -N;
+}
+
+/* { dg-final { scan-assembler "csneg\tw\[0-9\]*.*" } } */
+
+
+int
+fooinvsi (int a)
+{
+ return a ? N : ~N;
+}
+
+/* { dg-final { scan-assembler "csinv\tw\[0-9\]*.*" } } */
+
+
+long long
+foonegdi (long long a)
+{
+ return a ? N : -N;
+}
+
+long long
+largefooneg (long long a)
+{
+ return a ? M : -M;
+}
+
+/* { dg-final { scan-assembler "csneg\tx\[0-9\]*.*" } } */
+
+long long
+fooinvdi (long long a)
+{
+ return a ? N : ~N;
+}
+
+long long
+largefooinv (long long a)
+{
+ return a ? M : ~M;
+}
+
+/* { dg-final { scan-assembler "csinv\tx\[0-9\]*.*" } } */
+
+
+int
+main (void)
+{
+ if (foonegsi (1) != N)
+ abort ();
+
+ if (foonegsi (0) != -N)
+ abort ();
+
+ if (fooinvsi (1) != N)
+ abort ();
+
+ if (fooinvsi (0) != ~N)
+ abort ();
+
+ if (foonegdi (1) != N)
+ abort ();
+
+ if (foonegdi (0) != -N)
+ abort ();
+
+ if (fooinvdi (1) != N)
+ abort ();
+
+ if (fooinvdi (0) != ~N)
+ abort ();
+
+ if (largefooinv (0) != ~M)
+ abort ();
+
+ if (largefooneg (0) != -M)
+ abort ();
+
+ if (largefooinv (1) != M)
+ abort ();
+
+ if (largefooneg (1) != M)
+ abort ();
+
+ return 0;
+}
+
+/* { dg-final { scan-assembler-not "csel\tx\[0-9\]*.*" } } */
+/* { dg-final { scan-assembler-not "csel\tw\[0-9\]*.*" } } */
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH][AArch64][2/3] Implement negcc, notcc optabs
2015-09-01 15:04 [PATCH][AArch64][2/3] Implement negcc, notcc optabs Kyrill Tkachov
@ 2015-09-10 8:50 ` James Greenhalgh
0 siblings, 0 replies; 2+ messages in thread
From: James Greenhalgh @ 2015-09-10 8:50 UTC (permalink / raw)
To: Kyrill Tkachov; +Cc: GCC Patches, Marcus Shawcroft, Richard Earnshaw
On Tue, Sep 01, 2015 at 04:04:37PM +0100, Kyrill Tkachov wrote:
> Hi all,
>
> This second patch implements the new optabs for aarch64.
> The new expander is almost identical to the mov<mode>cc expander
> except that operand 2 has a neg or a not before it to reflect the
> fact that it should be negated if the comparison in operand 1 holds.
> These patterns will eventually match to the CSNEG and CSINV instructions.
>
> The test included shows the kind of code that triggers this.
> We will now create a single immediate move followed by a CSNEG (or CSINV)
> rather than performing two immediate moves followed by a CSEL.
>
> Bootstrapped and tested on aarch64-none-linux-gnu.
> diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
> index c3b985b..77bc7cd 100644
> --- a/gcc/config/aarch64/aarch64.md
> +++ b/gcc/config/aarch64/aarch64.md
> @@ -3038,6 +3038,24 @@ (define_expand "mov<mode>cc"
> }
> )
>
> +(define_expand "<neg_not_op><mode>cc"
> + [(set (match_operand:GPI 0 "register_operand" "")
> + (if_then_else:GPI (match_operand 1 "aarch64_comparison_operator" "")
> + (NEG_NOT:GPI (match_operand:GPI 2 "register_operand" ""))
> + (match_operand:GPI 3 "register_operand" "")))]
> + ""
> + {
> + rtx ccreg;
> + enum rtx_code code = GET_CODE (operands[1]);
> +
> + if (code == UNEQ || code == LTGT)
> + FAIL;
> +
> + ccreg = aarch64_gen_compare_reg (code, XEXP (operands[1], 0),
> + XEXP (operands[1], 1));
> + operands[1] = gen_rtx_fmt_ee (code, VOIDmode, ccreg, const0_rtx);
> + }
> +)
OK. Shame we can't refactor some of this duplicate expansion code...
Thanks,
James
> 2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
>
> * config/aarch64/aarch64.md (<neg_not_op><mode>cc): New define_expand.
> * config/aarch64/iterators.md (NEG_NOT): New code iterator.
> (neg_not_op): New code attribute.
>
> 2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
>
> * gcc.target/aarch64/cond_op_imm_1.c: New test.
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