https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47815
Adam Warner changed:
What|Removed |Added
Status|NEW |RESOLVED
Resolution|---
: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
Target Milestone: ---
xmm_register_variable_ICE.c:
#include
#include
typedef uint8_t u8x16_t __attribute__ ((vector_size (16)));
int main(void) {
register u8x16_t u8x16 asm
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65436
--- Comment #6 from Adam Warner adam at consulting dot net.nz ---
Sorry, I did not mean to send my previous comment. I updated the title and a
hasty comment I was about to edit got added.
It is unfair to dismiss my enhancement request as invalid
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65436
Adam Warner adam at consulting dot net.nz changed:
What|Removed |Added
Summary|Max number of extended asm |Max number
: enhancement
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html states:
The total number of input + output + goto operands is limited to 30.
It appears a + input
: enhancement
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
There is no way to inform the compiler one is reading a callee-saved register
without the compiler also writing the register
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65247
--- Comment #1 from Adam Warner adam at consulting dot net.nz ---
CLANG bug report:
http://llvm.org/bugs/show_bug.cgi?id=22735
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64119
Adam Warner adam at consulting dot net.nz changed:
What|Removed |Added
Status|RESOLVED|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64119
Adam Warner adam at consulting dot net.nz changed:
What|Removed |Added
Resolution|INVALID |FIXED
Component: inline-asm
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
//asm triggers local register variable data corruption
#include stdio.h
__attribute__((noinline)) void fn(int inputa, int inputb, int inputc) {
register int a asm (rax
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
Created attachment 33502
-- https://gcc.gnu.org/bugzilla/attachment.cgi?id=33502action=edit
ice.c:9:1: internal compiler error: in redirect_jump_1, at jump.c:1515
This may be related to Bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38354
--- Comment #11 from Adam Warner adam at consulting dot net.nz ---
Thank you Joseph for clarifying in Comment 10 why this should be considered an
enhancement request. It would be non-trivial to change the model of what GNU C
considers a constant
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38354
--- Comment #8 from Adam Warner adam at consulting dot net.nz ---
Joseph, you're correct:
4005fa: b8 c6 05 40 00 moveax,0x4005c6
4005ff: 89 05 cf 04 20 00 movDWORD PTR [rip+0x2004cf],eax
# 600ad4
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38354
--- Comment #6 from Adam Warner adam at consulting dot net.nz ---
Just to make sure I understand this correctly:
1. You won't confirm this bug because it violates the C standard.
2. GNU provides extensions to C when the C standard is too
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38354
--- Comment #4 from Adam Warner adam at consulting dot net.nz ---
Why can a compile-time array of 32-bit function pointers (compatible with the
non-large code model) be compiled using g++ but not gcc?
$ g++ -fpermissive
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46219
Adam Warner adam at consulting dot net.nz changed:
What|Removed |Added
Status|RESOLVED|REOPENED
Assignee: unassigned at gcc dot gnu.org
Reporter: adam at consulting dot net.nz
$ gcc-snapshot.sh --version
gcc (Debian 20140814-1) 4.10.0 20140814 (experimental) [trunk revision 213954]
weird_code_gen.c:
#include stdint.h
typedef void (*f_t)(uint64_t rdi, uint64_t rsi, uint64_t rdx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51840
--- Comment #11 from Adam Warner adam at consulting dot net.nz ---
Thank you for the fixed example! Just for the record only toy VM examples can
be implemented using this technique.
GCC documentation used to say that that the extended asm 30
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54445
--- Comment #8 from Adam Warner adam at consulting dot net.nz 2012-09-13
09:01:44 UTC ---
Awesome! Thanks Uros Bizjak and H.J. Lu for locating and fixing the bug.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54445
Bug #: 54445
Summary: TLS array lookup with negative constant is not
combined into a single instruction
Classification: Unclassified
Product: gcc
Version: 4.7.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54445
--- Comment #1 from Adam Warner adam at consulting dot net.nz 2012-09-01
03:00:39 UTC ---
Another example:
$ cat negative_constant_not_combined_into_a_single_instruction_example_2.c
#include stdint.h
__thread uint8_t byte_array[100];
uint64_t
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53623
--- Comment #3 from Adam Warner adam at consulting dot net.nz 2012-06-10
23:32:19 UTC ---
(Off topic Note correction)
In my previous note I suggested the instruction movsbq dh - rdx. There is no
such instruction! One cannot encode register ah/bh
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53623
Bug #: 53623
Summary: [4.7 Regression] sign extension is effectively split
into two x86-64 instructions
Classification: Unclassified
Product: gcc
Version: 4.7.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53133
Bug #: 53133
Summary: XOR AL,AL to zero lower 8 bits of EAX/RAX causes
partial register stall (Intel Core 2)
Classification: Unclassified
Product: gcc
Version: 4.7.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45434
--- Comment #7 from Adam Warner adam at consulting dot net.nz 2012-01-18
03:35:24 UTC ---
It does not appear to be possible to generate inline asm that leaves GCC to
choose the {ah, bh, ch, dh} register:
#include stdint.h
uint64_t u8l(uint64_t
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45434
--- Comment #8 from Adam Warner adam at consulting dot net.nz 2012-01-18
07:00:44 UTC ---
Apologies for the noise. I had my machine constraints around the wrong way.
Here is the fixed version of the code:
#include stdint.h
uint64_t u8l(uint64_t
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51840
Bug #: 51840
Summary: asm goto incorrect code generation at -O2 and -O3
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51840
--- Comment #2 from Adam Warner adam at consulting dot net.nz 2012-01-13
02:08:34 UTC ---
(In reply to comment #1)
I think the problem here is the label references are being moved which is
correct as GCC thinks the labels where the address
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44281
--- Comment #8 from Adam Warner adam at consulting dot net.nz 2011-03-04
10:51:01 UTC ---
Jakub, I fail to see how your conclusion not to do this is supported by the
facts. There are:
(a) six global register variables (though the same effect can
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44281
--- Comment #10 from Adam Warner adam at consulting dot net.nz 2011-03-05
02:01:04 UTC ---
Jakub,
Thanks for the explanation [The weird saving/restoring of %rdi into/from %r10
is because the RA chose to use %rdi for a temporary used
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44281
--- Comment #6 from Adam Warner adam at consulting dot net.nz 2011-03-04
07:22:47 UTC ---
Below is a very simple test case of an ordinary input argument to a function
being:
(a) copied to a spare register
(b) copied back from a spare register
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47815
Summary: Tail call regression with GCC snapshot
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47815
--- Comment #3 from Adam Warner adam at consulting dot net.nz 2011-02-19
13:55:43 UTC ---
OK I finally understand. Tail call optimisation also disappears when the
noreturn attribute is added to the leaf functions when compiled with gcc-4.5.
From
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46551
Summary: Generate complex addressing mode CMP instruction in
x86-64
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46551
--- Comment #1 from Adam Warner adam at consulting dot net.nz 2010-11-19
02:55:18 UTC ---
$ gcc-snapshot.sh --version
gcc (Debian 20101116-1) 4.6.0 20101116 (experimental) [trunk revision 166792]
$ gcc-snapshot.sh -std=gnu99 -O3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46219
Summary: Generate indirect jump instruction on x86-64
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
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