Hi Jeff,
On 29/07/15 23:38, Jeff Law wrote:
On 07/29/2015 07:49 AM, Kyrill Tkachov wrote:
Hi all,
This patch improves RTL if-conversion on sequences that perform a
conditional select on integer constants.
Most of the smart logic to do that already exists in the
noce_try_store_flag_constants
Hi!
While I still think that a generic libgomp plugin for non-shared memory
host execution is a good idea conceptually, for the following reasons:
On Wed, 19 Feb 2014 17:10:15 +0100, I wrote:
On Thu, 12 Dec 2013 12:31:40 +0100, I wrote:
On Fri, 8 Nov 2013 16:40:00 +0100, Jakub Jelinek
James Greenhalgh wrote:
On Tue, Jul 28, 2015 at 12:25:40PM +0100, Alan Lawrence wrote:
I'd have preferred the unrelated changes here as separate patches. If you
pull them out, they are OK to commit independent of this patch.
Done (r226352 and r226353).
Ah ok, I see what is going on here...
On Wed, Jul 29, 2015 at 11:16:40AM +0100, Richard Earnshaw wrote:
I'm getting a bit worried about the potential performance impact from
all these indirect function call hooks. This is a good example of when
it's probably somewhat unnecessary. I doubt that the compiler could
function
Le 29/07/2015 18:45, Steve Kargl a écrit :
On Wed, Jul 29, 2015 at 02:04:12PM +0200, Richard Biener wrote:
On Wed, Jul 29, 2015 at 1:59 PM, Mikael Morin mikael.mo...@sfr.fr wrote:
Le 29/07/2015 13:22, Richard Biener a écrit :
On Wed, Jul 29, 2015 at 11:34 AM, Mikael Morin mikael.mo...@sfr.fr
Hi,
On Thu, 30 Jul 2015, Richard Biener wrote:
@@ -4174,11 +4267,13 @@ main (int argc, char **argv)
else if (strcmp (argv[i], --generic) == 0)
gimple = false;
else if (strcmp (argv[i], -v) == 0)
- verbose = true;
+ verbose = 1;
If you don't want to start using
On Thu, Jul 30, 2015 at 12:47:20PM +0100, Alan Lawrence wrote:
James Greenhalgh wrote:
On Tue, Jul 28, 2015 at 12:25:40PM +0100, Alan Lawrence wrote:
I'd have preferred the unrelated changes here as separate patches. If you
pull them out, they are OK to commit independent of this patch.
Pretty simple. Both flag-types.h and tree-core.h check to see if the
other header has already defined this enumerated type, and defined it if
not.
Its an unnecessary conditional compilation and dual maintenance of this
small enum. This patch puts it in coretypes.h and makes it always
Hi Benedikt,
On 29/07/15 18:47, Benedikt Huber wrote:
* config/aarch64/aarch64-builtins.c: Builtins for rsqrt and
rsqrtf.
* config/aarch64/aarch64-opts.h: -mrecip has a default value
depending on the core.
* config/aarch64/aarch64-protos.h: Declare.
On Thu, Jul 30, 2015 at 01:47:37PM +0200, Thomas Schwinge wrote:
Here is such a libgomp plugin plus the infrastructure for initial support
of non-shared memory host execution. [...]
... the libgomp plugin as it is currently implemented fails to adequately
provide such functionality:
2015-07-30 0:56 GMT+02:00 Kai Tietz ktiet...@googlemail.com:
2015-07-29 19:48 GMT+02:00 Jason Merrill ja...@redhat.com:
On 07/28/2015 04:10 PM, Kai Tietz wrote:
The change to adjust_temp_type seems to be no more necessary (just
doing tests on it).
Yes, committed it.
@@ -3391,8 +3431,23 @@
This removes the assign RHS part. Likewise tested with an assert.
Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
Just spotted
case GIMPLE_TERNARY_RHS:
/* Try to fold a conditional expression. */
if (gimple_assign_rhs_code (stmt) == COND_EXPR)
{
so
This test is failing on Darwin, it turns out to be because TMPDIR is
set to a symlink, so after changing to that directory current_path()
returns a different path. We should canonicalize the paths before
comparing them.
Tested x86_64-linux, committed to trunk.
commit
expand_builtin_atomic_clear has code to handle an atomic_clear instruction.
However, no target defines such a pattern, and the code wouldn't compile
on any target that tried to define it, since the generator is passed the
memory model enum directly rather than via an rtx wrapper. It seems better
On Thu, Jul 30, 2015 at 3:02 PM, Richard Sandiford
richard.sandif...@arm.com wrote:
expand_builtin_atomic_clear has code to handle an atomic_clear instruction.
However, no target defines such a pattern, and the code wouldn't compile
on any target that tried to define it, since the generator is
On Thu, 30 Jul 2015, Richard Biener wrote:
The following patch avoids folding NaN 0 to false if -ftrapping-math
is in effect.
Bootstrap regtest pending on x86_64-unknown-linux-gnu.
FAIL: gcc.dg/fold-abs-4.c scan-tree-dump-times gimple ABS 0
FAIL: gcc.dg/pr15784-1.c scan-tree-dump-times
On 07/29/15 17:45, Nathan Sidwell wrote:
On 07/29/15 08:24, Nathan Sidwell wrote:
On 07/29/15 05:22, Thomas Schwinge wrote:
Likewise for the other torture testing flags.
Investigating ... (I've seen those failures be intermittent)
Interestingly the fails go away with an unoptimized
Hi all,
I tried bootstrapping on Thumb1 recently and hit an error while building libgcc
and in particular config/arm/crtfastmath.c.
This file generates vmrs instructions which are not allowed in Thumb1, causing
an assembler error.
The fix for that is to gate the file not only on !__SOFTFP__
James Greenhalgh wrote:
(define_mode_attr VRL2 [(V8QI V32QI) (V4HI V16HI)
(V2SI V8SI) (V2SF V8SF)
- (DI V4DI) (DF V4DF)
- (V16QI V32QI) (V8HI V16HI)
- (V4SI V8SI) (V4SF V8SF)
-
Kugan kugan.vivekanandara...@linaro.org writes:
* cse.c (cse_insn): Restoring old behaviour for src_eqv
when dest and value in the REG_EQUAL are same and dest
is STRICT_LOW_PART.
This fixes the regression and doesn't introduce any new one.
Andreas.
--
Andreas Schwab,
When I fixed PR59304, I forgot that a command-line warning can be also
an error if -Werror was enabled. This introduced a regression since
anything enabled in the command-line together with -Werror would get
initially classified as a warning when reaching the first #pragma GCC
diagnostic, and this
On Thu, Jul 30, 2015 at 05:40:15PM +0300, Ilya Verbin wrote:
Sure, but it's not possible to fully test data mapping without non-shared
address space. I've created new check_effective_target, ok for
gomp-4_1-branch?
* testsuite/lib/libgomp.exp
On Thu, 9 Jul 2015, Richard Biener wrote:
On Thu, 9 Jul 2015, Bernhard Reutner-Fischer wrote:
gcc/ChangeLog
2015-07-09 Bernhard Reutner-Fischer al...@gcc.gnu.org
* builtins.c (fold_builtin_tolower, fold_builtin_toupper): New
static functions.
(fold_builtin_1):
On 30/07/15 15:45, Kyrill Tkachov wrote:
Hi all,
I tried bootstrapping on Thumb1 recently and hit an error while building
libgcc and in particular config/arm/crtfastmath.c.
This file generates vmrs instructions which are not allowed in Thumb1,
causing an assembler error.
The fix for
On Thu, Jul 30, 2015 at 04:06:22PM +0100, Alan Lawrence wrote:
James Greenhalgh wrote:
(define_mode_attr VRL2 [(V8QI V32QI) (V4HI V16HI)
(V2SI V8SI) (V2SF V8SF)
- (DI V4DI) (DF V4DF)
- (V16QI V32QI) (V8HI V16HI)
-
On Thu, Jul 30, 2015 at 10:12:59 +0200, Jakub Jelinek wrote:
This test will fail on HSA, you don't assume just that it doesn't
fallback to host, but also non-shared address space.
I think it would be better to start with some check for non-shared address
space, like:
/* This test relies on
Hi Nathan!
On Wed, 29 Jul 2015 17:45:32 -0400, Nathan Sidwell nat...@acm.org wrote:
On 07/29/15 08:24, Nathan Sidwell wrote:
On 07/29/15 05:22, Thomas Schwinge wrote:
Likewise for the other torture testing flags.
Investigating ... (I've seen those failures be intermittent)
(For me,
2015-07-30 18:52 GMT+02:00 Jason Merrill ja...@redhat.com:
On 07/29/2015 06:56 PM, Kai Tietz wrote:
@@ -1430,6 +1438,8 @@ cxx_eval_call_expression (const
constexpr_ctx
*ctx,
tree t,
bool
reduced_constant_expression_p (tree t)
{
+ /* Make sure we remove useless initial
David Edelsohn dje@gmail.com writes:
On Wed, Jul 29, 2015 at 11:16:40AM +0100, Richard Earnshaw wrote:
I'm getting a bit worried about the potential performance impact from
all these indirect function call hooks. This is a good example of when
it's probably somewhat unnecessary. I doubt
Seger pointed out that the altivec_high_bit insn was not safe if it was called
when it could not allocate pseudos. I have removed that insn in this patch. I
will revise the patch. I had meant to tie it in with easy_altivec_constant
originally, and I will do a patch with that change.
Is this
Trevor Saunders tbsau...@tbsaunde.org writes:
On Wed, Jul 29, 2015 at 09:11:21AM +0100, Richard Sandiford wrote:
Trevor Saunders tbsau...@tbsaunde.org writes:
On Tue, Jul 28, 2015 at 09:24:17PM +0100, Richard Sandiford wrote:
Trevor Saunders tbsau...@tbsaunde.org writes:
On Mon, Jul 27,
I've committed this to gomp4. It adds spinlock builtins, which will be
necessary for complete reduction implementation. There is a single global and a
single .shared lock variable (of course the latter is per-cta). We lazily emit
these declarations, if locks are taken during compilation.
On Thu, Jul 30, 2015 at 10:12:59 +0200, Jakub Jelinek wrote:
On Wed, Jul 29, 2015 at 10:06:52PM +0300, Ilya Verbin wrote:
@@ -1241,6 +1245,62 @@ GOMP_target_update (int device, const void *unused,
size_t mapnum,
gomp_update (devicep, mapnum, hostaddrs, sizes, kinds, false);
}
It seems that this patch results in unresolved symbols.
I am quite sure that the code is right but build system should be adapted.
I noticed that *_cow.cc files are built with -fimplicit-templates. I try
to apply the same with the old abi but I still experiment unresolved
symbols.
Any help is
On Thu, Jul 30, 2015 at 10:44:33PM +0300, Ilya Verbin wrote:
libgomp/
* libgomp.h (enum gomp_map_vars_kind): New.
(gomp_map_vars): Change type of the argument from bool to enum
gomp_map_vars_kind.
* oacc-mem.c (acc_map_data, present_create_copy,
On 29 July 2015 at 16:03, Kyrill Tkachov kyrylo.tkac...@arm.com wrote:
Hi Prathamesh,
This is probably not appropriate for -Os optimisation.
And for speed optimisation I imagine it can vary a lot on the target the
code is run.
Do you have any benchmark results for this patch?
Hi Kyrill,
The attached patch fixes a problem identified in PR66870 with
split stack on ppc64 and ppc64le. If flag_split_stack is true, but
the function being processed has the no_split_stack attribute, then
the split stack prologue should not be generated.
Bootstrapped on ppc64le-linux and ppc64-linux,
On Thu, Jul 30, 2015 at 10:46 AM, Lynn A. Boger
labo...@linux.vnet.ibm.com wrote:
Can this patch be submitted to fix the ppc 32 bootstrap error?
On 06/19/2015 07:58 AM, Andreas Schwab wrote:
* go-lang.c (go_langhook_init_options_struct): Don't set
x_flag_split_stack.
On 07/30/2015 05:00 PM, Kai Tietz wrote:
2015-07-30 18:52 GMT+02:00 Jason Merrill ja...@redhat.com:
On 07/29/2015 06:56 PM, Kai Tietz wrote:
@@ -1430,6 +1438,8 @@ cxx_eval_call_expression (const
constexpr_ctx
*ctx,
tree t,
bool
reduced_constant_expression_p (tree t)
{
+ /*
New command-line options need documenting in invoke.texi.
--
Joseph S. Myers
jos...@codesourcery.com
Hi All,
The patch enables new attribute 'ctarget',
The attribute force compiler to create clones of a function with the attribute.
For example:
__attribute__((ctarget(avx,arch=slm,arch=core-avx2,default)))
int
foo ()
will create 3 clones of foo() optimized for corresponding targets and
replace
You can't apply both 'ctarget' and 'target' attributes to a function.
The patch uses same target specific methods to create dispatcher and
target clones.
On Fri, Jul 31, 2015 at 1:30 AM, Andrew Pinski pins...@gmail.com wrote:
On Thu, Jul 30, 2015 at 3:19 PM, Evgeny Stupachenko evstu...@gmail.com
On Fri, 31 Jul 2015, Evgeny Stupachenko wrote:
The patch enables new attribute 'ctarget',
Attributes should be documented in extend.texi.
--
Joseph S. Myers
jos...@codesourcery.com
On Thu, Jul 30, 2015 at 3:19 PM, Evgeny Stupachenko evstu...@gmail.com wrote:
Hi All,
The patch enables new attribute 'ctarget',
The attribute force compiler to create clones of a function with the
attribute.
For example:
__attribute__((ctarget(avx,arch=slm,arch=core-avx2,default)))
int
On Fri, 24 Jul 2015, tbsaunde+...@tbsaunde.org wrote:
From: Trevor Saunders tbsaunde+...@tbsaunde.org
gcc/ChangeLog:
2015-07-24 Trevor Saunders tbsaunde+...@tbsaunde.org
* config/rs6000/aix43.h (TARGET_DEFERRED_OUTPUT_DEFS): Remove.
* defaults.h
On 07/30/2015 05:02 PM, Jason Merrill wrote:
Actually ME deals with none-cannonical form too. It just asserts on
it at this place. After delayed-folding work I will continue work
(Jeff pushed first parts of this work already to ML) on eliminating
use of shorten_compare completely, and move
On 07/30/2015 04:19 PM, Evgeny Stupachenko wrote:
Hi All,
The patch enables new attribute 'ctarget',
The attribute force compiler to create clones of a function with the attribute.
For example:
__attribute__((ctarget(avx,arch=slm,arch=core-avx2,default)))
int
foo ()
will create 3 clones of
On 07/30/2015 03:01 AM, Jakub Jelinek wrote:
On Wed, Jul 29, 2015 at 04:48:23PM -0700, Aldy Hernandez wrote:
@@ -7490,8 +7503,12 @@ gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
== TREE_VEC_LENGTH (OMP_FOR_COND (for_stmt)));
gcc_assert (TREE_VEC_LENGTH (OMP_FOR_INIT
On Thu, Jul 30, 2015 at 03:30:12PM -0500, Lynn A. Boger wrote:
PR66870
* gcc/config/rs6000/rs6000.c: Add check for no_split_stack
function attribute along with flag_split_stack check to
determine when to generate split stack
On Thu, Jul 30, 2015 at 1:05 AM, Nathan Sidwell nat...@acm.org wrote:
Jakub,
this patch augments the lto wrapper to print out the arguments to spawned
commands when verbose. I found this useful in debugging recent development.
ok for trunk?
Err - fork_execute through collect_execute already
On Wed, Jul 29, 2015 at 10:06:52PM +0300, Ilya Verbin wrote:
@@ -1241,6 +1245,62 @@ GOMP_target_update (int device, const void *unused,
size_t mapnum,
gomp_update (devicep, mapnum, hostaddrs, sizes, kinds, false);
}
+static void
+gomp_exit_data (struct gomp_device_descr *devicep,
On Thu, Jul 30, 2015 at 10:15 AM, Jakub Jelinek ja...@redhat.com wrote:
On Thu, Jul 30, 2015 at 10:09:05AM +0200, Richard Biener wrote:
On Thu, Jul 30, 2015 at 1:05 AM, Nathan Sidwell nat...@acm.org wrote:
Jakub,
this patch augments the lto wrapper to print out the arguments to spawned
On Wed, Jul 29, 2015 at 04:44:46PM -0600, Jeff Law wrote:
On 07/29/2015 08:08 AM, Marek Polacek wrote:
As discussed elsewhere, -Wtautological-compare shouldn't warn about
floating-point types because of the way NaN behave.
I've been meaning to commit this one as obvious, but I'm not sure
This adds warnings when a pattern requires inputs to have no side-effects
to match for GENERIC code-gen. It also improves on some obvious cases
like escapes through predicates or a few special cases such as
TREE_REAL_CST.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.
On Thu, Jul 30, 2015 at 10:09:05AM +0200, Richard Biener wrote:
On Thu, Jul 30, 2015 at 1:05 AM, Nathan Sidwell nat...@acm.org wrote:
Jakub,
this patch augments the lto wrapper to print out the arguments to spawned
commands when verbose. I found this useful in debugging recent development.
Hello, gentle maintainer.
This is a message from the Translation Project robot.
A revised PO file for textual domain 'cpplib' has been submitted
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Hello, gentle maintainer.
This is a message from the Translation Project robot.
A revised PO file for textual domain 'gcc' has been submitted
by the Swedish team of translators. The file is available at:
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Hi Renlin,
On 30/07/15 16:50, Renlin Li wrote:
Hi all,
This insn should match the following similar rtx pattern and remove the
redundant zero_extend operation if the width of zero_extract and
inner-size of zero_extend totally match.
(set (zero_extract:SI (reg/i:SI 0 x0)
Dominik Vogt schrieb:
The attached patch fixes a glicht in the error message generated
for invalid values of enum options.
IMHO, the patch is incomplete.
diff --git a/gcc/opts-common.c b/gcc/opts-common.c
index 8e51974..3bcbaf1 100644
--- a/gcc/opts-common.c
+++ b/gcc/opts-common.c
@@
On Tue, Jul 21, 2015 at 02:45:39PM -0700, H.J. Lu wrote:
When __builtin_frame_address is used to retrieve the address of the
function stack frame, the frame pointer is always kept, which wastes one
register and 2 instructions. For x86-32, one less register means
significant negative impact on
On Wed, Jul 29, 2015 at 09:11:21AM +0100, Richard Sandiford wrote:
Trevor Saunders tbsau...@tbsaunde.org writes:
On Tue, Jul 28, 2015 at 09:24:17PM +0100, Richard Sandiford wrote:
Trevor Saunders tbsau...@tbsaunde.org writes:
On Mon, Jul 27, 2015 at 09:05:08PM +0100, Richard Sandiford
Hi Uros,
You seems committing the test case in the wrong directory. I found it
in testsuite/gcc.target/pr66648.c.
Regards,
Renlin
On Sat, Jul 25, 2015 at 10:23 AM, Uros Bizjak ubiz...@gmail.com wrote:
We have to emit check for main loop execution UNLESS we guarantee that
min_size is at least
Hi all,
This insn should match the following similar rtx pattern and remove the
redundant zero_extend operation if the width of zero_extract and
inner-size of zero_extend totally match.
(set (zero_extract:SI (reg/i:SI 0 x0)
(const_int 8 [0x8])
On Thu, Jul 30, 2015 at 6:01 PM, Renlin Li renlin@gmail.com wrote:
Hi Uros,
You seems committing the test case in the wrong directory. I found it
in testsuite/gcc.target/pr66648.c.
Thanks, I have moved the test to the correct place.
Uros.
On 07/29/2015 06:56 PM, Kai Tietz wrote:
@@ -1430,6 +1438,8 @@ cxx_eval_call_expression (const constexpr_ctx
*ctx,
tree t,
bool
reduced_constant_expression_p (tree t)
{
+ /* Make sure we remove useless initial NOP_EXPRs. */
+ STRIP_NOPS (t);
Checked, and removing those
On Wed, Jul 29, 2015 at 1:23 PM, H.J. Lu hjl.to...@gmail.com wrote:
On Wed, Jul 29, 2015 at 1:13 PM, Alexandre Oliva aol...@redhat.com wrote:
On Jul 23, 2015, H.J. Lu hjl.to...@gmail.com wrote:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66978
Forget C++ tests.
On Fri, Jul 31, 2015 at 1:19 AM, Evgeny Stupachenko evstu...@gmail.com wrote:
Hi All,
The patch enables new attribute 'ctarget',
The attribute force compiler to create clones of a function with the
attribute.
For example:
On Wed, 29 Jul 2015, Michael Meissner wrote:
#6 Add support for using different names for the 64/128-bit integer
conversion to IBM extended double, to allow a future version to
switch the default for what long double is. It is not expected that GCC
6.x will make this
Can this patch be submitted to fix the ppc 32 bootstrap error?
On 06/19/2015 07:58 AM, Andreas Schwab wrote:
* go-lang.c (go_langhook_init_options_struct): Don't set
x_flag_split_stack.
(go_langhook_post_options): Set it here instead.
---
gcc/go/go-lang.c | 9 +
On 07/30/2015 10:52 AM, Jason Merrill wrote:
This hunk is necessary as we don't use canonical-form produced by
shorten_compare anymore. Therefore special operand can occur on
right-hand side too.
That seems like a problem, if the middle end is expecting the canonical
form. What is your plan
I noticed that on the concepts branch we were printing an extra '*' when
dumping an expression involving references, but haven't been able to
come up with a testcase for the trunk.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit c81115210bdc4dbc5614a1fea4dca59fa9f42af9
Author: Jason
On 29/07/15 22:08 +0200, François Dumont wrote:
Hi
Here is a patch to add irreflexive debug check.
Awesome!
You can add PR libstdc++/60519 to the changelog.
Standard algos signatures are such that there is no guaranty that
the operator or predicate to compare the iterator value
This refactors things to remove duplicated code and make it easier
to add more of it.
Bootstrap on x86_64-unknown-linux-gnu running, no changes in generated
code.
Richard.
2015-07-30 Richard Biener rguent...@suse.de
* genmatch.c (decision_tree::gen_gimple): Merge with ...
On Wed, Jul 29, 2015 at 04:48:23PM -0700, Aldy Hernandez wrote:
@@ -7490,8 +7503,12 @@ gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
== TREE_VEC_LENGTH (OMP_FOR_COND (for_stmt)));
gcc_assert (TREE_VEC_LENGTH (OMP_FOR_INIT (for_stmt))
== TREE_VEC_LENGTH
When I fixed any's copying of non-trivial types I broke the
self-assignment case. This adds an explicit check for it.
Thanks to Axel Menzel for noticing the bug.
Tested ppc64le-linux, committed to trunk.
commit 8a9db2d69b88c72ca0fd794c1058918069787f83
Author: Jonathan Wakely jwak...@redhat.com
On 29/07/15 21:55 -0700, Tim Shen wrote:
- typedef _Matchertypename _TraitsT::char_type _MatcherT;
+ typedef _Matcher_Char_type _MatcherT;
+ static_assert(sizeof(_MatcherT) == sizeof(_Matcherchar),
+ The aussmption std::functionbool(char) has
+
On Thu, Jul 30, 2015 at 10:29 AM, Marek Polacek pola...@redhat.com wrote:
On Wed, Jul 29, 2015 at 04:44:46PM -0600, Jeff Law wrote:
On 07/29/2015 08:08 AM, Marek Polacek wrote:
As discussed elsewhere, -Wtautological-compare shouldn't warn about
floating-point types because of the way NaN
Hi,
for the time being this is the last installment. As anticipated, in some
cases (4 overall) I'm using location_of instead of the simple
DECL_SOURCE_LOCATION: in the case of note_name_declared_in_class the
testsuite would pass anyway, but I prefer to be safe.
Tested x86_64-linux.
Thanks,
On 07/30/15 04:28, Richard Biener wrote:
On Thu, Jul 30, 2015 at 10:15 AM, Jakub Jelinek ja...@redhat.com wrote:
On Thu, Jul 30, 2015 at 10:09:05AM +0200, Richard Biener wrote:
On Thu, Jul 30, 2015 at 1:05 AM, Nathan Sidwell nat...@acm.org wrote:
Jakub,
this patch augments the lto wrapper to
The following patch avoids folding NaN 0 to false if -ftrapping-math
is in effect.
Bootstrap regtest pending on x86_64-unknown-linux-gnu.
Richard.
2015-07-30 Richard Biener rguent...@suse.de
PR middle-end/67052
* fold-const.c (fold_binary_loc): Do not fold NaN 0 to false
I've committed this to gomp4 branch.
The vector neutering code already has machinery to generate DI/DF shuffles from
the SI underlying instruction. This generalizes that machinery and changes the
shuffle-down machinery to use it. Less code duplication - yay! Also added a DF
mode shuffle
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