2518889872
Implement "general dynamic", "initial exec" and "local exec" TLS models for
...
X86 32 bits.
llvm-svn: 36283
2007-04-20 21:38:10 +00:00
ff0598de75
rename X86FunctionInfo to X86MachineFunctionInfo to match the header file
...
it is defined in.
llvm-svn: 36196
2007-04-17 17:21:52 +00:00
a8cc1ebae1
Consistency with native compilers
...
llvm-svn: 35532
2007-03-31 13:11:52 +00:00
ddf082082c
Putting more constants which do not contain relocations into .literal{4|8|16}
...
llvm-svn: 35026
2007-03-08 08:31:54 +00:00
13a1d96963
Put constant data to .const, .const_data, .literal{4|8|16} sections.
...
llvm-svn: 35016
2007-03-08 01:07:07 +00:00
af8be4458f
Ensure that fastcall'ed function is correctly mangled & stack is
...
properly aligned
llvm-svn: 34788
2007-03-01 16:29:22 +00:00
0e083d0161
Darwin -static should codegen static ctors / dtors to .constructor / .destructor sections.
...
llvm-svn: 33657
2007-01-30 08:04:53 +00:00
037c867b54
Propagate changes from my local tree. This patch includes:
...
1. New parameter attribute called 'inreg'. It has meaning "place this
parameter in registers, if possible". This is some generalization of
gcc's regparm(n) attribute. It's currently used only in X86-32 backend.
2. Completely rewritten CC handling/lowering code inside X86 backend.
Merged stdcall + c CCs and fastcall + fast CC.
3. Dropped CSRET CC. We cannot add struct return variant for each
target-specific CC (e.g. stdcall + csretcc and so on).
4. Instead of CSRET CC introduced 'sret' parameter attribute. Setting in
on first attribute has meaning 'This is hidden pointer to structure
return. Handle it gently'.
5. Fixed small bug in llvm-extract + add new feature to
FunctionExtraction pass, which relinks all internal-linkaged callees
from deleted function to external linkage. This will allow further
linking everything together.
NOTEs: 1. Documentation will be updated soon.
2. llvm-upgrade should be improved to translate csret => sret.
Before this, there will be some unexpected test fails.
llvm-svn: 33597
2007-01-28 13:31:35 +00:00
a341fab0af
The zerofill directive needs a newline after it.
...
llvm-svn: 33327
2007-01-18 02:30:19 +00:00
4b8d03e084
Minor code clean up.
...
llvm-svn: 33323
2007-01-18 01:49:58 +00:00
f64cc9edd1
restructure code a bit to make use of continue (simplifying things). Generalize
...
the .zerofill directive emission to not be darwin-specific
llvm-svn: 33304
2007-01-17 17:44:25 +00:00
3f6d52834b
* Fix one more bug in PIC codegen: extra load is needed for *all*
...
non-statics.
* Introduce new option to output zero-initialized data to .bss section.
This can reduce size of binaries. Enable it by default for ELF &
Cygwin/Mingw targets. Probably, Darwin should be also added.
llvm-svn: 33299
2007-01-17 10:33:08 +00:00
4f01b783a3
Emit symbol type information for ELF/COFF targets
...
llvm-svn: 33256
2007-01-16 16:41:57 +00:00
8c51bf5bf6
add support for hidden visibility to darwin/x86
...
llvm-svn: 33198
2007-01-14 06:29:53 +00:00
6bbb29ba40
darwin doesn't use .hidden. Disable this until we fix it right.
...
llvm-svn: 33191
2007-01-14 00:50:56 +00:00
a0554d90e8
* PIC codegen for X86/Linux has been implemented
...
* PIC-aware internal structures in X86 Codegen have been refactored
* Visibility (default/weak) has been added
* Docs fixes (external weak linkage, visibility, formatting)
llvm-svn: 33136
2007-01-12 19:20:47 +00:00
4efbbc963f
Really big cleanup.
...
- New target type "mingw" was introduced
- Same things for both mingw & cygwin are marked as "cygming" (as in
gcc)
- .lcomm is supported here, so allow LLVM to use it
- Correctly use underscored versions of setjmp & _longjmp for both mingw
& cygwin
llvm-svn: 32833
2007-01-03 11:43:14 +00:00
1ef9cd400d
eliminate static ctors for Statistic objects.
...
llvm-svn: 32703
2006-12-19 22:59:26 +00:00
d7998d0e6d
move ExtWeakSymbols to AsmPrinter
...
llvm-svn: 32648
2006-12-18 03:37:18 +00:00
b313efb0cd
fix test/Regression/CodeGen/X86/weak.ll
...
if a variable has no initialization, I->getInitializer() will fail
llvm-svn: 32407
2006-12-09 23:14:08 +00:00
700b873130
Detemplatize the Statistic class. The only type it is instantiated with
...
is 'unsigned'.
llvm-svn: 32279
2006-12-06 17:46:33 +00:00
022030a425
Add weak reference directive.
...
llvm-svn: 32091
2006-12-01 20:47:11 +00:00
5fb2c76d59
A initialized global variable cannot be extern weak. However, if a global value's initializer is itself a external weak symbol, emit the weak reference.
...
llvm-svn: 32069
2006-12-01 09:13:26 +00:00
5b020349f2
Minor code clean up.
...
llvm-svn: 32067
2006-12-01 07:38:23 +00:00
db66456285
Fix indentation.
...
llvm-svn: 32066
2006-12-01 07:17:00 +00:00
6476a3b4ba
Darwin X86 external weak linkage support.
...
llvm-svn: 32065
2006-12-01 07:15:24 +00:00
12c94949e0
Introducing external weak linkage. Darwin codegen should be added later.
...
llvm-svn: 32052
2006-12-01 00:25:12 +00:00
a41c2d6432
Nuke dead code.
...
llvm-svn: 31327
2006-10-31 21:53:31 +00:00
aa4c0f9374
1. Clean up code due to changes in SwitchTo*Section(2)
...
2. Added partial debug support for mingw\cygwin targets (the same as
Linux\ELF). Please note, that currently mingw\cygwin uses 'stabs' format
for storing debug info by default, thus many (runtime) libraries has
this information included. These formats shouldn't be mixed in one binary
('stabs' & 'DWARF'), otherwise binutils tools will be confused.
llvm-svn: 31311
2006-10-31 08:31:24 +00:00
49993529eb
Unbreaking static ctors patch.
...
Defaulting second arguments of SwitchTo*Section, this should make things
somehow clearer.
llvm-svn: 31306
2006-10-31 06:11:06 +00:00
2545fe6d93
Make this compile again.
...
llvm-svn: 31304
2006-10-31 01:45:56 +00:00
de5ecd6bc1
Apply Aton's LLVM patch for PR973: Linux ctors / dtors support.
...
llvm-svn: 31303
2006-10-31 01:26:55 +00:00
b51b5c0b1f
Add debug support for X86/ELF targets (Linux). This allows llvm-gcc4
...
generated object modules to be debugged with gdb. Hopefully this helps
pre-release debugging.
llvm-svn: 31299
2006-10-30 22:32:30 +00:00
0d782b4c60
Doh. Must check if GV is constant first.
...
llvm-svn: 31252
2006-10-28 05:56:06 +00:00
392f645783
Put cstrings in .cstring section when compiling for Mac OS X.
...
llvm-svn: 31203
2006-10-26 19:18:18 +00:00
71b99297aa
Move getPreferredAlignmentLog from AsmPrinter to TargetData
...
llvm-svn: 31171
2006-10-24 20:32:14 +00:00
41a83d7871
Do section switching right way for Mingw\Cygwin and Linux.
...
This will allow (after llvm-gcc linkage fix) more dummy tests using
libstdc++ to pass on mingw :)
llvm-svn: 31120
2006-10-22 21:37:13 +00:00
24b7ac303c
Fixed mingw\cygwin linkonce linkage once again.
...
Added workaround for linker bug with linkonce sections.
Changed sections prefix to allow linker merge them
(PE loader doesn't like too much long-named sections :) )
All of this unbreaks libstdc++ on mingw32 allowing (small)
programs to be compiled, linked and run.
llvm-svn: 31033
2006-10-18 09:12:29 +00:00
75b01beb2f
Adding linkonce linkage codegeneration support for mingw32\cygwin
...
targets.
llvm-svn: 31011
2006-10-17 20:29:49 +00:00
34e051d537
Align stack size to DWORD boundary
...
llvm-svn: 30964
2006-10-14 20:53:35 +00:00
104aa5dbc1
Various random and minor code cleanups.
...
llvm-svn: 30608
2006-09-26 03:57:53 +00:00
3c5b3df6a0
Adding codegeneration for StdCall & FastCall calling conventions
...
llvm-svn: 30549
2006-09-20 22:03:51 +00:00
6f7072c66a
Added some eye-candy for Subtarget type checking
...
Added X86 StdCall & FastCall calling conventions. Codegen will follow.
llvm-svn: 30446
2006-09-17 20:25:45 +00:00
d61d39ec53
Adding dllimport, dllexport and external weak linkage types.
...
DLL* linkages got full (I hope) codegeneration support in C & both x86
assembler backends.
External weak linkage added for future use, we don't provide any
codegeneration, etc. support for it.
llvm-svn: 30374
2006-09-14 18:23:27 +00:00
11b0a5dbd4
Committing X86-64 support.
...
llvm-svn: 30177
2006-09-08 06:48:29 +00:00
261779bb45
Make target asm info a property of the target machine.
...
llvm-svn: 30162
2006-09-07 22:06:40 +00:00
c7abe471fe
Make the x86 asm flavor part of the subtarget info.
...
llvm-svn: 30146
2006-09-07 12:23:47 +00:00
a6211dcdad
Separate target specific asm properties from the asm printers.
...
llvm-svn: 30126
2006-09-06 18:34:40 +00:00
984c1a4a8f
Emit .set directives for jump table entries when possible, which reduces
...
the number of relocations in object files, shrinkifying them.
llvm-svn: 29650
2006-08-12 21:29:52 +00:00
3b4866e194
Use the predicate.
...
llvm-svn: 29322
2006-07-27 02:05:13 +00:00
787565024a
Support jump tables when in PIC relocation model
...
llvm-svn: 29318
2006-07-27 01:13:04 +00:00
2e1d01541a
Add an out-of-line virtual method for X86DwarfWriter to give it a home.
...
llvm-svn: 29153
2006-07-14 23:05:05 +00:00
56737d4fe3
Move .literal4 and .literal8 support into AsmPrinter.cpp
...
llvm-svn: 28978
2006-06-29 00:33:06 +00:00
87813744ba
Doh.
...
llvm-svn: 28963
2006-06-28 17:56:43 +00:00
0687b04455
Oops. Need to keep CP index.
...
llvm-svn: 28958
2006-06-28 07:55:24 +00:00
7f88856d95
Darwin puts float and double literal constants into literal4 and literal8 sections.
...
llvm-svn: 28957
2006-06-28 07:35:41 +00:00
0de66677e7
Be consistent with gcc.
...
llvm-svn: 28682
2006-06-04 07:24:07 +00:00
29296b844f
Minor bug caught by Ashwin Chandra
...
llvm-svn: 28491
2006-05-26 06:22:34 +00:00
2554e3d9ba
X86 / Cygwin asm / alignment fixes.
...
Patch contributed by Anton Korobeynikov!
llvm-svn: 28480
2006-05-25 21:59:08 +00:00
d0201946ad
Fix the MASM asmprinter's lies. It does not want to emit code to .text/.data
...
it wants it emitted to _text/_data.
llvm-svn: 28185
2006-05-09 05:12:53 +00:00
8488ba2e41
Split SwitchSection into SwitchTo{Text|Data}Section methods.
...
llvm-svn: 28184
2006-05-09 04:59:56 +00:00
ce9b9fe6eb
Fix some loose ends in MASM support.
...
llvm-svn: 28148
2006-05-06 21:27:14 +00:00
c22d4bede5
Print *some* grouping around inline asm blocks so we know where they are.
...
llvm-svn: 28133
2006-05-05 21:48:50 +00:00
f812a4fa75
Make Intel syntax the default when LLVM is built with VC++.
...
llvm-svn: 28095
2006-05-04 16:19:27 +00:00
20a631fde7
Refactor TargetMachine, pushing handling of TargetData into the target-specific subclasses. This has one caller-visible change: getTargetData() now returns a pointer instead of a reference.
...
This fixes PR 759.
llvm-svn: 28074
2006-05-03 01:29:57 +00:00
287dc5be0d
Hooray, everyone now uses the same printBasicBlockLabel implementation
...
llvm-svn: 28056
2006-05-02 17:34:51 +00:00
b9d4f8324d
Extend printBasicBlockLabel a bit so that it can be used to print all
...
basic block labels, consolidating the code to do so in one place for each
target.
llvm-svn: 28050
2006-05-02 05:37:32 +00:00
4ca2ea5b43
JumpTable support! What this represents is working asm and jit support for
...
x86 and ppc for 100% dense switch statements when relocations are non-PIC.
This support will be extended and enhanced in the coming days to support
PIC, and less dense forms of jump tables.
llvm-svn: 27947
2006-04-22 18:53:45 +00:00
cf0166fbeb
Change interface to DwarfWriter.
...
llvm-svn: 26991
2006-03-23 18:09:44 +00:00
2dd2c652b2
Added getTargetLowering() to TargetMachine. Refactored targets to support this.
...
llvm-svn: 26742
2006-03-13 23:20:37 +00:00
313570fb17
Use "llvm.metadata" section for debug globals. Filter out these globals in the
...
asm printer.
llvm-svn: 26599
2006-03-07 22:00:35 +00:00
a4a4ceb478
- Emit subsections_via_symbols for Darwin.
...
- Conditionalize Dwarf debugging output (Darwin only for now).
llvm-svn: 26582
2006-03-07 02:23:26 +00:00
30d7b70b73
Enable Dwarf debugging info.
...
llvm-svn: 26581
2006-03-07 02:02:57 +00:00
16f08f53b1
"." isn't enough to get a private label on linux, use ".L".
...
llvm-svn: 26327
2006-02-23 05:25:02 +00:00
1f342c2884
PIC related bug fixes.
...
1. Various asm printer bug.
2. Lowering bug. Now TargetGlobalAddress is wrapped in X86ISD::TGAWrapper.
llvm-svn: 26324
2006-02-23 02:43:52 +00:00
2d23c9f1ab
Use .zerofill on x86/darwin.
...
llvm-svn: 26196
2006-02-15 01:56:23 +00:00
2e07d6370a
Darwin doesn't support #APP/#NO_APP
...
llvm-svn: 26066
2006-02-08 23:42:22 +00:00
adeb8fb5a2
Fixed a local common symbol bug.
...
llvm-svn: 26044
2006-02-07 23:32:58 +00:00
ec212fb66d
For ELF, .comm takes alignment value as the optional 3rd argument. It must be
...
specified in bytes.
llvm-svn: 26043
2006-02-07 21:54:08 +00:00
5a76680de1
Darwin ABI issues: weak, linkonce, etc. dynamic-no-pic support is complete.
...
Also fixed a function stub bug. Added weak and linkonce support for
x86 Linux.
llvm-svn: 26038
2006-02-07 08:38:37 +00:00
c070cb685d
Use getPreferredAlignmentLog.
...
llvm-svn: 25980
2006-02-05 01:45:04 +00:00
87079884d1
Use the shared asmprinter code for printing special llvm globals
...
llvm-svn: 24695
2005-12-13 06:32:50 +00:00
4d80f6e52e
Add ELF and darwin support for static ctors and dtors
...
llvm-svn: 24693
2005-12-13 04:53:51 +00:00
ac6cb46429
Use HasDotTypeDotSizeDirective instead of forELF
...
llvm-svn: 24481
2005-11-21 23:06:54 +00:00
78161dbc84
Remove a level of indentation by using a continue.
...
llvm-svn: 24479
2005-11-21 22:48:18 +00:00
99be8f766f
Use subtarget information computed by X86Subtarget instead of rolling our own.
...
llvm-svn: 24477
2005-11-21 22:39:40 +00:00
ebc39f5a9c
Add a forELF flag, allowing the removal of forCygwin and simplification of
...
conditionals.
llvm-svn: 24475
2005-11-21 22:19:48 +00:00
7df25ab429
simplify and genericize this code
...
llvm-svn: 24473
2005-11-21 19:50:31 +00:00
4a7eb5132b
prune #include
...
llvm-svn: 24468
2005-11-21 08:33:17 +00:00
8a5f3c1b68
Switch to using the shared constant pool printer, along with using shorter
...
CPI ids
llvm-svn: 24467
2005-11-21 08:32:23 +00:00
99946fb63f
Adjust to capitalized AsmPrinter method names
...
llvm-svn: 24456
2005-11-21 07:51:23 +00:00
050bf2faf8
convert the rest of this over to use SwitchSection
...
llvm-svn: 24448
2005-11-21 07:16:34 +00:00
024e32e118
Start using the AsmPrinter shared SwitchSection code. This allows the X86
...
backend to implement global variables in sections.
llvm-svn: 24447
2005-11-21 07:11:11 +00:00
2c0b435ba6
Rename SwitchSection -> switchSection to avoid conflicting with a future
...
change.
llvm-svn: 24443
2005-11-21 06:55:27 +00:00
618981fd03
Naturally align doubles in the constant pool, set PrivateGlobalPrefix on
...
darwin, use it when printing the constant pool indices so the labels are
appropriately private, emit cp entries to .const instead of .data on darwin
and only emit a single .section for the constant pool, not one for each
entry.
llvm-svn: 24440
2005-11-21 06:46:22 +00:00
5f4ef3c5a8
Eliminate all remaining tabs and trailing spaces.
...
llvm-svn: 22523
2005-07-27 06:12:32 +00:00
57b9ed522d
A couple more darwinisms
...
llvm-svn: 22450
2005-07-16 01:59:47 +00:00
83b492b83c
Commit some pending darwin changes before subtarget support.
...
llvm-svn: 22388
2005-07-12 01:37:28 +00:00
0d2f043c41
Fix crazy indentation
...
llvm-svn: 22380
2005-07-11 06:25:47 +00:00
b62a4c8da6
Add support for assembling .s files on mac os x for intel
...
Add support for running bugpoint on mac os x for intel
llvm-svn: 22351
2005-07-08 00:23:26 +00:00
9a1dc72729
The statistic needs to be in the correct namespace.
...
llvm-svn: 22327
2005-07-01 23:56:38 +00:00
b97404687a
Refactor X86AsmPrinter.cpp into multiple files. Patch contributed
...
by Aaron Gray, cleaned up by me.
llvm-svn: 22324
2005-07-01 22:44:09 +00:00
718387e491
Make the x86 asm printer darwin-aware. This mostly entails doing the same
...
thing as cygwin most of the time, and printing our alignments in log2
rather than number of bytes.
llvm-svn: 22316
2005-06-30 00:53:20 +00:00
9cb5a82cdc
Fixed indentation.
...
llvm-svn: 22270
2005-06-20 19:59:22 +00:00
c88330ad13
* Remove trailing whitespace
...
* Convert tabs to spaces
llvm-svn: 21426
2005-04-21 23:38:14 +00:00
7b9020a059
Fix the missing symbols problem Bill was hitting. Patch contributed by
...
Bill Wendling!!
llvm-svn: 20649
2005-03-17 15:38:16 +00:00
531f9e92d4
This mega patch converts us from using Function::a{iterator|begin|end} to
...
using Function::arg_{iterator|begin|end}. Likewise Module::g* -> Module::global_*.
This patch is contributed by Gabor Greif, thanks!
llvm-svn: 20597
2005-03-15 04:54:21 +00:00
00658b80fb
Patch to make assembly output compatible with mingw compilation (identical
...
to cygwin)
llvm-svn: 20520
2005-03-08 17:02:05 +00:00
30226da5b3
Support Cygwin assembly generation. The cygwin version of Gnu ASsembler
...
doesn't support certain directives and symbols on cygwin are prefixed with
an underscore. This patch makes the necessary adjustments to the output.
llvm-svn: 19775
2005-01-23 03:52:14 +00:00
bb4c14f270
Print a load of a null pointer (in intel mode) like this:
...
mov %AX, WORD PTR [0]
instead of like this:
mov %AX, WORD PTR []
llvm-svn: 19501
2005-01-12 04:07:11 +00:00
b372fab2be
Print a load of a null pointer like this:
...
movw 0, %ax
instead of like this:
movw , %ax
llvm-svn: 19500
2005-01-12 04:05:19 +00:00
20d74fd986
Adjust to changes in asmwriter filenames
...
llvm-svn: 18987
2004-12-16 17:33:24 +00:00
7f245d47c5
GhostLinkage should not reach asm printing stage
...
llvm-svn: 17750
2004-11-14 21:03:49 +00:00
56c4c99cca
Don't print unneeded labels
...
llvm-svn: 17714
2004-11-13 23:27:11 +00:00
af19d396ac
Give the asmprinter the ability to print memrefs with a constant pool index,
...
index reg and scale
llvm-svn: 17081
2004-10-17 07:16:32 +00:00
19025d5ad0
Give the X86 asm printer the ability to print out addressing modes that have
...
constant displacements from global variables. Patch by Jeff Cohen!
llvm-svn: 17009
2004-10-15 04:44:53 +00:00
d1ab378be5
* Prune #includes
...
* Update comments
* Rearrange code a bit
* Finally ELIMINATE the GAS workaround emitter for Intel mode. woot!
llvm-svn: 16647
2004-10-04 07:31:08 +00:00
68ab0beb1b
Add support for emitting AT&T style .s files, and make it the default. Users
...
may now choose their output format with the -x86-asm-syntax={intel|att} flag.
llvm-svn: 16646
2004-10-04 07:24:48 +00:00
5683260187
Add support for the -x86-asm-syntax flag, which can be used to choose between
...
Intel and AT&T style assembly language. The ultimate goal of this is to
eliminate the GasBugWorkaroundEmitter class, but for now AT&T style emission
is not fully operational.
llvm-svn: 16639
2004-10-03 20:36:57 +00:00
7c16caa336
Changes For Bug 352
...
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.
llvm-svn: 16137
2004-09-01 22:55:40 +00:00
10262ab3f1
Rename var
...
llvm-svn: 15897
2004-08-18 02:22:55 +00:00
866b58d2ef
Start using alignment output routines from AsmPrinter.
...
Changes to make this more similar to the ppc asmprinter
llvm-svn: 15890
2004-08-17 19:25:42 +00:00
b3739ceb6e
Use the AsmPrinter emitGlobalConstant.
...
llvm-svn: 15872
2004-08-17 06:48:55 +00:00
9cf46456cb
Start using the AsmPrinter to emit our first class constants. This also
...
drops our half-assed support for cygwin, which noone uses and doesn't work
anyway.
llvm-svn: 15839
2004-08-16 23:16:06 +00:00
085663c4ec
Remove a dead method
...
llvm-svn: 15659
2004-08-11 07:07:14 +00:00
d1bee6ee12
Finally, the entire instruction asmprinter is now generated from tblgen, woo!
...
llvm-svn: 15658
2004-08-11 07:02:04 +00:00
a0bafce127
Add asmprintergen support for the last X86 instruction that needs it: pcrelative calls.
...
llvm-svn: 15657
2004-08-11 06:59:12 +00:00
b975636f71
Move hacks up
...
llvm-svn: 15654
2004-08-11 06:09:55 +00:00
09ee05bcdf
Convert asmprinter to new style of instruction printer
...
Start asmprintergen'ifying machine instrs with memory operands.
llvm-svn: 15646
2004-08-11 02:25:00 +00:00
832437255d
Stop using getValues().
...
llvm-svn: 15487
2004-08-04 08:44:43 +00:00
e42675f5af
Get rid of 3 of the 4 'printimplicit' flags. Implicit operands are now
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explicitly listed in the asm string.
llvm-svn: 15397
2004-08-01 08:22:29 +00:00
06cf67ee14
Handle registers a bit more efficiently
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llvm-svn: 15395
2004-08-01 08:12:41 +00:00
d5540021fc
The tblgen'erated asmparser wants a way to print operands.
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llvm-svn: 15392
2004-08-01 07:43:46 +00:00
9520d20c83
Rename the Printer class -> X86AsmPrinter.
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Include the tablegenerated assembly writer.
llvm-svn: 15389
2004-08-01 06:02:08 +00:00
a332a646a0
Fix indentation: should be 2 spaces.
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llvm-svn: 15240
2004-07-26 18:48:58 +00:00
cf7d3af07f
Fix file header as it has been renamed.
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llvm-svn: 15239
2004-07-26 18:45:48 +00:00
bca562404c
Renamed files to have the `X86' prefix for uniqueness purposes.
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All CVS history was renamed, the *,v were copied over. No worries.
llvm-svn: 15238
2004-07-26 18:43:11 +00:00
Lauro Ramos Venancio