If we have this situation:
jCC L1
jmp L2
L1:
...
L2:
...
We can get a small performance boost by emitting this instead:
jnCC L2
L1:
...
L2:
...
This testcase shows an example of this:
float func(float x, float y) {
double product = (double)x * y;
if (product == 0.0)
return product;
return product - 1.0;
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101075 91177308-0d34-0410-b5e6-96231b3b80d8
libEnhancedDisassembly, so we now build the
static library in all cases (although the shared
library is only built when requested/possible).
Also, fixed a bug where edis wasn't properly
initializing the targets it uses.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101072 91177308-0d34-0410-b5e6-96231b3b80d8
expression is a UDiv and it doesn't appear that the UDiv came from
the user's source.
ScalarEvolution has recently figured out how to compute a tripcount
expression for the inner loop in
SingleSource/Benchmarks/Shootout/sieve.c, using a udiv. Emitting a
udiv instruction dramatically slows down the enclosing loop.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101068 91177308-0d34-0410-b5e6-96231b3b80d8
time I use the LIBS variable, which is not subject
to a %.a -> -l% transformation, to link llvm-mc
against libEnhancedDisassembly.
llvm-mc -edis works the same as llvm-mc
-disassemble, but outputs tokens and operands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101058 91177308-0d34-0410-b5e6-96231b3b80d8
ARM_AM::getSoImmVal(V) with a legitimate so_imm value: #245 rotate right by 2.
Introduce ARM_AM::getSOImmValOneOrNoRotate(unsigned Arg) which is called from
ARMInstPrinter.cpp's printSOImm() function, replacing ARM_AM::getSOImmVal(V).
[12:44:43] johnny:/Volumes/data/llvm/git/trunk (local-trunk) $ gdb Debug/bin/llvm-mc
GNU gdb 6.3.50-20050815 (Apple version gdb-1346) (Fri Sep 18 20:40:51 UTC 2009)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries ... done
(gdb) set args -triple=arm-apple-darwin9 -debug-only=arm-disassembler --disassemble
(gdb) r
Starting program: /Volumes/data/llvm/git/trunk/Debug/bin/llvm-mc -triple=arm-apple-darwin9 -debug-only=arm-disassembler --disassemble
Reading symbols for shared libraries ++. done
0xf5 0x71 0xf0 0x53
Opcode=201 Name=MVNi Format=ARM_FORMAT_DPFRM(4)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
-------------------------------------------------------------------------------------------------
| 0: 1: 0: 1| 0: 0: 1: 1| 1: 1: 1: 1| 0: 0: 0: 0| 0: 1: 1: 1| 0: 0: 0: 1| 1: 1: 1: 1| 0: 1: 0: 1|
-------------------------------------------------------------------------------------------------
mvnpls r7, Assertion failed: (V != -1 && "Not a valid so_imm value!"), function printSOImm, file ARMInstPrinter.cpp, line 229.
Program received signal SIGABRT, Aborted.
0x00007fff88c65886 in __kill ()
(gdb) bt
#0 0x00007fff88c65886 in __kill ()
#1 0x00007fff88d05eae in abort ()
#2 0x00007fff88cf2ef0 in __assert_rtn ()
#3 0x000000010020e422 in printSOImm (O=@0x1010bdf80, V=-1, VerboseAsm=false, MAI=0x1020106d0) at ARMInstPrinter.cpp:229
#4 0x000000010020e5fe in llvm::ARMInstPrinter::printSOImmOperand (this=0x1020107e0, MI=0x7fff5fbfee70, OpNum=1, O=@0x1010bdf80) at ARMInstPrinter.cpp:254
#5 0x00000001001ffbc0 in llvm::ARMInstPrinter::printInstruction (this=0x1020107e0, MI=0x7fff5fbfee70, O=@0x1010bdf80) at ARMGenAsmWriter.inc:3236
#6 0x000000010020c27c in llvm::ARMInstPrinter::printInst (this=0x1020107e0, MI=0x7fff5fbfee70, O=@0x1010bdf80) at ARMInstPrinter.cpp:182
#7 0x000000010003cbff in PrintInsts (DisAsm=@0x10200f4e0, Printer=@0x1020107e0, Bytes=@0x7fff5fbff060, SM=@0x7fff5fbff078) at Disassembler.cpp:65
#8 0x000000010003c8b4 in llvm::Disassembler::disassemble (T=@0x1010c13c0, Triple=@0x1010b6798, Buffer=@0x102010690) at Disassembler.cpp:153
#9 0x000000010004095c in DisassembleInput (ProgName=0x7fff5fbff3f0 "/Volumes/data/llvm/git/trunk/Debug/bin/llvm-mc") at llvm-mc.cpp:347
#10 0x000000010003eefb in main (argc=4, argv=0x7fff5fbff298) at llvm-mc.cpp:374
(gdb) q
The program is running. Exit anyway? (y or n) y
[13:36:26] johnny:/Volumes/data/llvm/git/trunk (local-trunk) $
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101053 91177308-0d34-0410-b5e6-96231b3b80d8
The information is already available with "opt -analyze". The DominatorTree
does also not have this in its runOnFunction. So they behave now
more consistent.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101038 91177308-0d34-0410-b5e6-96231b3b80d8
a ScalarEvolution bug with overflow handling is fixed, the normal analysis
code will automatically decline to operate on the icmp instructions which
are responsible for the loop exit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101032 91177308-0d34-0410-b5e6-96231b3b80d8
AddRecs so that it checks for overflow in the computation that it is
performing, rather than just checking hasNo{Signed,Unsigned}Wrap, since
those flags are for a different computation. This fixes a bug that
impacts an upcoming change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101028 91177308-0d34-0410-b5e6-96231b3b80d8
instead of deleting just the user. This makes it more consistent with
other code in IndVarSimplify, and theoretically can eliminate more users
earlier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101027 91177308-0d34-0410-b5e6-96231b3b80d8
the loop exit test. This usually doesn't come up for a variety of
reasons, but it isn't impossible, so make IndVarSimplify handle it
conservatively.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101008 91177308-0d34-0410-b5e6-96231b3b80d8
variables. For example, with code like this:
for (i=0;i<n;++i)
if (i<n)
x[i] = 0;
IndVarSimplify will now recognize that i is always less than n inside
the loop, and eliminate the if.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101000 91177308-0d34-0410-b5e6-96231b3b80d8
parameters in the CBE by implicitly adding a fixed argument.
This allows eliminating a work-around from DAE. Patch by
Sylvere Teissier!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100944 91177308-0d34-0410-b5e6-96231b3b80d8
in r86005 and unintentionally changed the default from -O3 to -O2.
- It's odd the things automated perf testing turns up! :)
- Also, the configure diff is messed up slightly. It looks like someone either
didn't regenerate configure correctly (or I didn't), or autoconf has some
funnyness in it. Eric, any ideas?
This has been at -O2 for so long, that I am slightly nervous that this change
will uncover miscompiles of LLVM on other systems. If that is the case, I think
we should just set the default universally at -O3, and let developers/vendors
use -O3 if they want it and have tested it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100941 91177308-0d34-0410-b5e6-96231b3b80d8
