* [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands
[not found] <7d649d85-73fa-4c37-bd6e-d3527500196b@zmail14.collab.prod.int.phx2.redhat.com>
@ 2011-10-20 14:25 ` Kai Tietz
2011-10-21 9:52 ` Richard Guenther
0 siblings, 1 reply; 4+ messages in thread
From: Kai Tietz @ 2011-10-20 14:25 UTC (permalink / raw)
To: gcc-patches; +Cc: Richard Guenther
Hello,
this patch re-enables the branch-cost optimization on simple boolean-typed operands, which are casted to a wider integral type. This happens due casts from
boolean-types are preserved, but FE might expands simple-expression to wider mode.
I added two tests for already working branch-cost optimization for IA-architecture and
two for explicit checking for boolean-type.
ChangeLog
2011-10-20 Kai Tietz <ktietz@redhat.com>
* fold-const.c (simple_operand_p_2): Handle integral
casts from boolean-operands.
2011-10-20 Kai Tietz <ktietz@redhat.com>
* gcc.target/i386/branch-cost1.c: New test.
* gcc.target/i386/branch-cost2.c: New test.
* gcc.target/i386/branch-cost3.c: New test.
* gcc.target/i386/branch-cost4.c: New test.
Bootstrapped and regression tested on x86_64-unknown-linux-gnu for all languages including Ada and Obj-C++. Ok for apply?
Regards,
Kai
Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
===================================================================
--- /dev/null
+++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
+
+extern int doo (void);
+
+int
+foo (int a, int b)
+{
+ if (a && b)
+ return doo ();
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
+/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
+/* { dg-final { cleanup-tree-dump "gimple" } } */
Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
===================================================================
--- /dev/null
+++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
+
+extern int doo (void);
+
+int
+foo (_Bool a, _Bool b)
+{
+ if (a && b)
+ return doo ();
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
+/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
+/* { dg-final { cleanup-tree-dump "gimple" } } */
Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
===================================================================
--- /dev/null
+++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
+
+extern int doo (void);
+
+int
+foo (_Bool a, _Bool b)
+{
+ if (a && b)
+ return doo ();
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
+/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
+/* { dg-final { cleanup-tree-dump "gimple" } } */
Index: gcc-head/gcc/fold-const.c
===================================================================
--- gcc-head.orig/gcc/fold-const.c
+++ gcc-head/gcc/fold-const.c
@@ -3706,6 +3706,19 @@ simple_operand_p_2 (tree exp)
/* Strip any conversions that don't change the machine mode. */
STRIP_NOPS (exp);
+ /* Handle integral widening casts from boolean-typed
+ expressions as simple. This happens due casts from
+ boolean-types are preserved, but FE might expands
+ simple-expression to wider mode. */
+ if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
+ && CONVERT_EXPR_P (exp)
+ && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0)))
+ == BOOLEAN_TYPE)
+ {
+ exp = TREE_OPERAND (exp, 0);
+ STRIP_NOPS (exp);
+ }
+
code = TREE_CODE (exp);
if (TREE_SIDE_EFFECTS (exp)
Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost1.c
===================================================================
--- /dev/null
+++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
+
+extern int doo (void);
+
+int
+foo (int a, int b)
+{
+ if (a && b)
+ return doo ();
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
+/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
+/* { dg-final { cleanup-tree-dump "gimple" } } */
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands
2011-10-20 14:25 ` [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands Kai Tietz
@ 2011-10-21 9:52 ` Richard Guenther
2011-10-21 12:40 ` Kai Tietz
0 siblings, 1 reply; 4+ messages in thread
From: Richard Guenther @ 2011-10-21 9:52 UTC (permalink / raw)
To: Kai Tietz; +Cc: gcc-patches
On Thu, Oct 20, 2011 at 3:08 PM, Kai Tietz <ktietz@redhat.com> wrote:
> Hello,
>
> this patch re-enables the branch-cost optimization on simple boolean-typed operands, which are casted to a wider integral type. This happens due casts from
> boolean-types are preserved, but FE might expands simple-expression to wider mode.
>
> I added two tests for already working branch-cost optimization for IA-architecture and
> two for explicit checking for boolean-type.
>
> ChangeLog
>
> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>
> * fold-const.c (simple_operand_p_2): Handle integral
> casts from boolean-operands.
>
> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>
> * gcc.target/i386/branch-cost1.c: New test.
> * gcc.target/i386/branch-cost2.c: New test.
> * gcc.target/i386/branch-cost3.c: New test.
> * gcc.target/i386/branch-cost4.c: New test.
>
> Bootstrapped and regression tested on x86_64-unknown-linux-gnu for all languages including Ada and Obj-C++. Ok for apply?
>
> Regards,
> Kai
>
> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
> ===================================================================
> --- /dev/null
> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
> @@ -0,0 +1,16 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
> +
> +extern int doo (void);
> +
> +int
> +foo (int a, int b)
> +{
> + if (a && b)
> + return doo ();
> + return 0;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
> +/* { dg-final { cleanup-tree-dump "gimple" } } */
> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
> ===================================================================
> --- /dev/null
> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
> @@ -0,0 +1,16 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
> +
> +extern int doo (void);
> +
> +int
> +foo (_Bool a, _Bool b)
> +{
> + if (a && b)
> + return doo ();
> + return 0;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
> +/* { dg-final { cleanup-tree-dump "gimple" } } */
> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
> ===================================================================
> --- /dev/null
> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
> @@ -0,0 +1,16 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
> +
> +extern int doo (void);
> +
> +int
> +foo (_Bool a, _Bool b)
> +{
> + if (a && b)
> + return doo ();
> + return 0;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
> +/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
> +/* { dg-final { cleanup-tree-dump "gimple" } } */
> Index: gcc-head/gcc/fold-const.c
> ===================================================================
> --- gcc-head.orig/gcc/fold-const.c
> +++ gcc-head/gcc/fold-const.c
> @@ -3706,6 +3706,19 @@ simple_operand_p_2 (tree exp)
> /* Strip any conversions that don't change the machine mode. */
> STRIP_NOPS (exp);
>
> + /* Handle integral widening casts from boolean-typed
> + expressions as simple. This happens due casts from
> + boolean-types are preserved, but FE might expands
> + simple-expression to wider mode. */
> + if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
> + && CONVERT_EXPR_P (exp)
> + && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0)))
> + == BOOLEAN_TYPE)
> + {
> + exp = TREE_OPERAND (exp, 0);
> + STRIP_NOPS (exp);
> + }
> +
Huh, well. I think the above is just too special and you instead should
replace the existing STRIP_NOPS by
while (CONVERT_EXPR_P (exp))
exp = TREE_OPERAND (exp, 0);
with a comment that conversions are considered simple.
Ok with that change, if it bootstraps & tests ok.
Richard.
> code = TREE_CODE (exp);
>
> if (TREE_SIDE_EFFECTS (exp)
> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost1.c
> ===================================================================
> --- /dev/null
> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost1.c
> @@ -0,0 +1,16 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
> +
> +extern int doo (void);
> +
> +int
> +foo (int a, int b)
> +{
> + if (a && b)
> + return doo ();
> + return 0;
> +}
> +
> +/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
> +/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands
2011-10-21 9:52 ` Richard Guenther
@ 2011-10-21 12:40 ` Kai Tietz
2011-10-23 10:11 ` Richard Guenther
0 siblings, 1 reply; 4+ messages in thread
From: Kai Tietz @ 2011-10-21 12:40 UTC (permalink / raw)
To: Richard Guenther; +Cc: Kai Tietz, gcc-patches
2011/10/21 Richard Guenther <richard.guenther@gmail.com>:
> On Thu, Oct 20, 2011 at 3:08 PM, Kai Tietz <ktietz@redhat.com> wrote:
>> Hello,
>>
>> this patch re-enables the branch-cost optimization on simple boolean-typed operands, which are casted to a wider integral type. This happens due casts from
>> boolean-types are preserved, but FE might expands simple-expression to wider mode.
>>
>> I added two tests for already working branch-cost optimization for IA-architecture and
>> two for explicit checking for boolean-type.
>>
>> ChangeLog
>>
>> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>>
>> * fold-const.c (simple_operand_p_2): Handle integral
>> casts from boolean-operands.
>>
>> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>>
>> * gcc.target/i386/branch-cost1.c: New test.
>> * gcc.target/i386/branch-cost2.c: New test.
>> * gcc.target/i386/branch-cost3.c: New test.
>> * gcc.target/i386/branch-cost4.c: New test.
>>
>> Bootstrapped and regression tested on x86_64-unknown-linux-gnu for all languages including Ada and Obj-C++. Ok for apply?
>>
>> Regards,
>> Kai
>>
>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
>> ===================================================================
>> --- /dev/null
>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
>> @@ -0,0 +1,16 @@
>> +/* { dg-do compile } */
>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
>> +
>> +extern int doo (void);
>> +
>> +int
>> +foo (int a, int b)
>> +{
>> + if (a && b)
>> + return doo ();
>> + return 0;
>> +}
>> +
>> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
>> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
>> ===================================================================
>> --- /dev/null
>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
>> @@ -0,0 +1,16 @@
>> +/* { dg-do compile } */
>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
>> +
>> +extern int doo (void);
>> +
>> +int
>> +foo (_Bool a, _Bool b)
>> +{
>> + if (a && b)
>> + return doo ();
>> + return 0;
>> +}
>> +
>> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
>> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
>> ===================================================================
>> --- /dev/null
>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
>> @@ -0,0 +1,16 @@
>> +/* { dg-do compile } */
>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
>> +
>> +extern int doo (void);
>> +
>> +int
>> +foo (_Bool a, _Bool b)
>> +{
>> + if (a && b)
>> + return doo ();
>> + return 0;
>> +}
>> +
>> +/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
>> +/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>> Index: gcc-head/gcc/fold-const.c
>> ===================================================================
>> --- gcc-head.orig/gcc/fold-const.c
>> +++ gcc-head/gcc/fold-const.c
>> @@ -3706,6 +3706,19 @@ simple_operand_p_2 (tree exp)
>> /* Strip any conversions that don't change the machine mode. */
>> STRIP_NOPS (exp);
>>
>> + /* Handle integral widening casts from boolean-typed
>> + expressions as simple. This happens due casts from
>> + boolean-types are preserved, but FE might expands
>> + simple-expression to wider mode. */
>> + if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
>> + && CONVERT_EXPR_P (exp)
>> + && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0)))
>> + == BOOLEAN_TYPE)
>> + {
>> + exp = TREE_OPERAND (exp, 0);
>> + STRIP_NOPS (exp);
>> + }
>> +
>
> Huh, well. I think the above is just too special and you instead should
> replace the existing STRIP_NOPS by
>
> while (CONVERT_EXPR_P (exp))
> exp = TREE_OPERAND (exp, 0);
>
> with a comment that conversions are considered simple.
>
> Ok with that change, if it bootstraps & tests ok.
>
> Richard.
Ok, bootstrapped and regression-tested on x86_64-unknown-linux-gnu and
applied to trunk with modifying as you suggested.
One question I have about handling of TRUTH-binaries in general in
fold-const.c. Why aren't we enforcing already here in fold_binary for
those operations, that operands get boolean-type? I see here some
advantages of C-AST folding. I've tested it and saw that even later
in SSA-passes we get slightly better results on that.
Regards,
Kai
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands
2011-10-21 12:40 ` Kai Tietz
@ 2011-10-23 10:11 ` Richard Guenther
0 siblings, 0 replies; 4+ messages in thread
From: Richard Guenther @ 2011-10-23 10:11 UTC (permalink / raw)
To: Kai Tietz; +Cc: Kai Tietz, gcc-patches
On Fri, Oct 21, 2011 at 2:19 PM, Kai Tietz <ktietz70@googlemail.com> wrote:
> 2011/10/21 Richard Guenther <richard.guenther@gmail.com>:
>> On Thu, Oct 20, 2011 at 3:08 PM, Kai Tietz <ktietz@redhat.com> wrote:
>>> Hello,
>>>
>>> this patch re-enables the branch-cost optimization on simple boolean-typed operands, which are casted to a wider integral type. This happens due casts from
>>> boolean-types are preserved, but FE might expands simple-expression to wider mode.
>>>
>>> I added two tests for already working branch-cost optimization for IA-architecture and
>>> two for explicit checking for boolean-type.
>>>
>>> ChangeLog
>>>
>>> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>>>
>>> * fold-const.c (simple_operand_p_2): Handle integral
>>> casts from boolean-operands.
>>>
>>> 2011-10-20 Kai Tietz <ktietz@redhat.com>
>>>
>>> * gcc.target/i386/branch-cost1.c: New test.
>>> * gcc.target/i386/branch-cost2.c: New test.
>>> * gcc.target/i386/branch-cost3.c: New test.
>>> * gcc.target/i386/branch-cost4.c: New test.
>>>
>>> Bootstrapped and regression tested on x86_64-unknown-linux-gnu for all languages including Ada and Obj-C++. Ok for apply?
>>>
>>> Regards,
>>> Kai
>>>
>>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
>>> ===================================================================
>>> --- /dev/null
>>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost2.c
>>> @@ -0,0 +1,16 @@
>>> +/* { dg-do compile } */
>>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
>>> +
>>> +extern int doo (void);
>>> +
>>> +int
>>> +foo (int a, int b)
>>> +{
>>> + if (a && b)
>>> + return doo ();
>>> + return 0;
>>> +}
>>> +
>>> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
>>> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
>>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
>>> ===================================================================
>>> --- /dev/null
>>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost3.c
>>> @@ -0,0 +1,16 @@
>>> +/* { dg-do compile } */
>>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=2" } */
>>> +
>>> +extern int doo (void);
>>> +
>>> +int
>>> +foo (_Bool a, _Bool b)
>>> +{
>>> + if (a && b)
>>> + return doo ();
>>> + return 0;
>>> +}
>>> +
>>> +/* { dg-final { scan-tree-dump-times "if " 1 "gimple" } } */
>>> +/* { dg-final { scan-tree-dump-times " & " 1 "gimple" } } */
>>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>>> Index: gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
>>> ===================================================================
>>> --- /dev/null
>>> +++ gcc-head/gcc/testsuite/gcc.target/i386/branch-cost4.c
>>> @@ -0,0 +1,16 @@
>>> +/* { dg-do compile } */
>>> +/* { dg-options "-O2 -fdump-tree-gimple -mbranch-cost=0" } */
>>> +
>>> +extern int doo (void);
>>> +
>>> +int
>>> +foo (_Bool a, _Bool b)
>>> +{
>>> + if (a && b)
>>> + return doo ();
>>> + return 0;
>>> +}
>>> +
>>> +/* { dg-final { scan-tree-dump-times "if " 2 "gimple" } } */
>>> +/* { dg-final { scan-tree-dump-not " & " "gimple" } } */
>>> +/* { dg-final { cleanup-tree-dump "gimple" } } */
>>> Index: gcc-head/gcc/fold-const.c
>>> ===================================================================
>>> --- gcc-head.orig/gcc/fold-const.c
>>> +++ gcc-head/gcc/fold-const.c
>>> @@ -3706,6 +3706,19 @@ simple_operand_p_2 (tree exp)
>>> /* Strip any conversions that don't change the machine mode. */
>>> STRIP_NOPS (exp);
>>>
>>> + /* Handle integral widening casts from boolean-typed
>>> + expressions as simple. This happens due casts from
>>> + boolean-types are preserved, but FE might expands
>>> + simple-expression to wider mode. */
>>> + if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
>>> + && CONVERT_EXPR_P (exp)
>>> + && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0)))
>>> + == BOOLEAN_TYPE)
>>> + {
>>> + exp = TREE_OPERAND (exp, 0);
>>> + STRIP_NOPS (exp);
>>> + }
>>> +
>>
>> Huh, well. I think the above is just too special and you instead should
>> replace the existing STRIP_NOPS by
>>
>> while (CONVERT_EXPR_P (exp))
>> exp = TREE_OPERAND (exp, 0);
>>
>> with a comment that conversions are considered simple.
>>
>> Ok with that change, if it bootstraps & tests ok.
>>
>> Richard.
>
> Ok, bootstrapped and regression-tested on x86_64-unknown-linux-gnu and
> applied to trunk with modifying as you suggested.
>
> One question I have about handling of TRUTH-binaries in general in
> fold-const.c. Why aren't we enforcing already here in fold_binary for
> those operations, that operands get boolean-type? I see here some
> advantages of C-AST folding. I've tested it and saw that even later
> in SSA-passes we get slightly better results on that.
Because we do not want to mess with the Frontends AST.
Richard.
> Regards,
> Kai
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2011-10-20 14:25 ` [patch tree-optimization]: allow branch-cost optimization for truth-and/or on mode-expanded simple boolean-operands Kai Tietz
2011-10-21 9:52 ` Richard Guenther
2011-10-21 12:40 ` Kai Tietz
2011-10-23 10:11 ` Richard Guenther
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