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170 Commits

Author SHA1 Message Date
Duncan Sands
cdd4f8c7cb Correct bogus module triple specifications. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112469 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 10:48:29 +00:00
Dan Gohman
7a4994356b Instead, teach SimplifyCFG to trim non-address-taken blocks from 
indirectbr destination lists.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111122 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-16 14:41:14 +00:00
Dan Gohman
e2c6d131d1 Teach SimplifyCFG how to simplify indirectbr instructions. 
- Eliminate redundant successors.
 - Convert an indirectbr with one successor into a direct branch.

Also, generalize SimplifyCFG to be able to be run on a function entry block.
It knows quite a few simplifications which are applicable to the entry
block, and it only needs a few checks to avoid trouble with the entry block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111060 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-14 00:29:42 +00:00
Benjamin Kramer
c125fedcc7 Test case for r105914. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105915 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-13 16:16:54 +00:00
Chris Lattner
c7d7e0cbe0 make simplifycfg insert an llvm.trap before the 'unreachable' it introduces 
when it detects undefined behavior.  llvm.trap generally codegens into some
thing really small (e.g. a 2 byte ud2 instruction on x86) and debugging this
sort of thing is "nontrivial".  For example, we now compile:

void foo() { *(int*)0 = 42; }

into:

_foo:
	pushl	%ebp
	movl	%esp, %ebp
	ud2

Some may even claim that this is a security hole, though that seems dubious
to me.  This addresses rdar://7958343 - Optimizing away null dereference 
potentially allows arbitrary code execution


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103356 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-08 22:15:59 +00:00
Gabor Greif
4e86da71b3 testcase for r99914, provided by baldrick! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100043 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-31 20:37:13 +00:00
Dan Gohman
a9445e11c5 Floating-point add, sub, and mul are now spelled fadd, fsub, and fmul, 
respectively.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97531 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-02 01:11:08 +00:00
Jakob Stoklund Olesen
58e9ee85fd Teach SimplifyCFG about magic pointer constants. 
Weird code sometimes uses pointer constants other than null. This patch
teaches SimplifyCFG to build switch instructions in those cases.

Code like this:

void f(const char *x) {
  if (!x)
    puts("null");
  else if ((uintptr_t)x == 1)
    puts("one");
  else if (x == (char*)2 || x == (char*)3)
    puts("two");
  else if ((intptr_t)x == 4)
    puts("four");
  else
    puts(x);
}

Now becomes a switch:

define void @f(i8* %x) nounwind ssp {
entry:
  %magicptr23 = ptrtoint i8* %x to i64            ; <i64> [#uses=1]
  switch i64 %magicptr23, label %if.else16 [
    i64 0, label %if.then
    i64 1, label %if.then2
    i64 2, label %if.then9
    i64 3, label %if.then9
    i64 4, label %if.then14
  ]

Note that LLVM's own DenseMap uses magic pointers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95439 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-05 22:03:18 +00:00
Dan Gohman
aceba31b7a Delete useless trailing semicolons. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92740 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-05 17:55:26 +00:00
Chris Lattner
c17e2849d1 fix two bogus tests that the asmparser now rejects. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92303 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-30 05:54:51 +00:00
Chris Lattner
1a0e7081c3 Implement PR5795 by merging duplicated return blocks. This could go further 
by merging all returns in a function into a single one, but simplifycfg 
currently likes to duplicate the return (an unfortunate choice!)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91890 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-22 06:07:30 +00:00
Chris Lattner
42385b03aa convert to filecheck 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91889 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-22 06:04:26 +00:00
Dan Gohman
14bbbf3168 Optimize test more. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86714 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-10 21:02:18 +00:00
Chris Lattner
8fb02511d2 optimize test 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86672 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-10 07:44:36 +00:00
Dan Gohman
438b583dbd Revert r85667. LoopUnroll currently can't call utility functions which 
auto-update the DominatorTree because it doesn't keep the DominatorTree
current while it works.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85670 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-31 17:33:01 +00:00
Dan Gohman
f230d8ad15 Merge the enhancements from LoopUnroll's FoldBlockIntoPredecessor into 
MergeBlockIntoPredecessor. This makes SimplifyCFG slightly more aggressive,
and makes it unnecessary for LoopUnroll to have its own copy of this code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85667 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-31 16:08:00 +00:00
Dan Gohman
cf35517c4e Add a testcase for the recent duplicate PHI elimination changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85636 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-30 23:16:10 +00:00
Chris Lattner
dac8bde235 if basic blocks are destroyed while there are *just* BlockAddress' hanging 
around, then zap them.  This is analogous to dangling constantexprs hanging
off functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85627 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-30 22:39:36 +00:00
Chris Lattner
11f15dbb28 change simplifycfg to not duplicate 'unwind' instructions. Hopefully 
this will increase the likelihood of common code getting sunk towards
the unwind.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83996 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-13 18:13:05 +00:00
Chris Lattner
bf07da0e27 convert to filecheck 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83995 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-13 18:10:05 +00:00
Chris Lattner
f137f2f4c5 rename test 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83994 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-10-13 18:08:21 +00:00
Dan Gohman
f2f6ce65b7 Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-11 18:01:28 +00:00
Chris Lattner
50b957549b fix a bunch of spurious failures for people whose home directory 
is sabre.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81528 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-11 17:02:12 +00:00
Dan Gohman
7c1a96c7a7 Convert a few more opt | llvm-dis to opt -S. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81261 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-08 22:41:33 +00:00
Dan Gohman
3e054fe9ef Use opt -S instead of piping bitcode output through llvm-dis. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81257 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-08 22:34:10 +00:00
Dan Gohman
b1e1e82c54 Change these tests to feed the assembly files to opt directly, instead 
of using llvm-as, now that opt supports this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81226 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-08 16:50:01 +00:00
Devang Patel
e4b275610a Reapply 79977. 
Use MDNodes to encode debug info in llvm IR.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80406 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-08-28 23:24:31 +00:00
Devang Patel
8245988835 Revert 79977. It causes llvm-gcc bootstrap failures on some platforms. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80073 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-08-26 05:01:18 +00:00
Devang Patel
2a610c7387 Update DebugInfo interface to use metadata, instead of special named llvm.dbg.... global variables, to encode debugging information in llvm IR. This is mostly a mechanical change that tests metadata support very well. 
This change speeds up llvm-gcc by more then 6% at "-O0 -g" (measured by compiling InstructionCombining.cpp!)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79977 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-08-25 05:24:07 +00:00
Eli Friedman
12bb766ae9 Fix for PR3016: detect the tricky case, where there are 
unfoldable references to a PHI node in the block being folded, and disable
the transformation in that case.  The correct transformation of such PHI
nodes depends on whether BB dominates Succ, and dominance is expensive 
to compute here.  (Alternatively, it's possible to check whether any 
uses are live, but that's also essentially a dominance calculation. 
Another alternative is to use reg2mem, but it probably isn't a good idea to
use that in simplifycfg.)

Also, remove some incorrect code from CanPropagatePredecessorsForPHIs 
which is made unnecessary with this patch: it didn't consider the case 
where a PHI node in BB has multiple uses.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79174 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-08-16 04:23:49 +00:00
Dale Johannesen
fa196e34b0 Revert 75571; I'm convinced this isn't the right thing to do. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75642 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-07-14 17:48:25 +00:00
Dale Johannesen
4458ab0d83 Don't delete asm's just because their inputs are undefined; 
xor R, R is a common and valid idiom for zeroing a register, for example.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75571 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-07-14 00:45:38 +00:00
Dale Johannesen
c1f104054d Fix the crash in this test. This is basically the same 
problem addressed in 31284, but the patch there only
addressed the case where an invoke is the first thing in
a block.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73416 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-15 20:59:27 +00:00
Dan Gohman
ae3a0be92e Split the Add, Sub, and Mul instruction opcodes into separate 
integer and floating-point opcodes, introducing
FAdd, FSub, and FMul.

For now, the AsmParser, BitcodeReader, and IRBuilder all preserve
backwards compatability, and the Core LLVM APIs preserve backwards
compatibility for IR producers. Most front-ends won't need to change
immediately.

This implements the first step of the plan outlined here:
http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72897 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-04 22:49:04 +00:00
Dale Johannesen
6f21a8f636 Testcase for 71688. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71691 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-13 18:33:24 +00:00
Devang Patel
06b1e67d44 While hoisting instruction to speculatively execute simple bb, ignore dbg intrinsics. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66255 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-06 06:00:17 +00:00
Zhou Sheng
a8d57fe96b Ignore dbg info intrinsics when folding conditional branch to 
conditional branch predecessors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65509 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-26 06:56:37 +00:00
Zhou Sheng
9a7c743fc0 Don't block basic block with only SwitchInst to fold into predecessors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65456 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-25 15:34:27 +00:00
Devang Patel
5622f07a21 While folding unconditional return move DbgRegionEndInst into the predecessor, instead of removing it. This fixes following tests from llvmgcc42 testsuite. 
gcc.c-torture/execute/20000605-3.c
gcc.c-torture/execute/20020619-1.c
gcc.c-torture/execute/20030920-1.c
gcc.c-torture/execute/loop-ivopts-1.c



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65353 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-24 00:05:16 +00:00
Devang Patel
bd75b8345f If llvm.dbg.region.end is disappearing then remove corresponding llvm.dbg.func.start also. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64278 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-11 01:29:06 +00:00
Devang Patel
0464a1431b Ignore dbg intrinsic while folding unconditional branch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64242 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-10 22:14:17 +00:00
Devang Patel
2cc86a1de1 Ignore dbg intrinsics while folding switch instruction. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63802 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-05 00:30:42 +00:00
Devang Patel
d0a203d76f Ignore dbg intrinsics. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63781 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-04 21:39:48 +00:00
Devang Patel
556b20ab46 While folding vallue comparison terminators ignore dbg intrinsics. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63700 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-04 01:06:11 +00:00
Devang Patel
65085cf7b3 Ignore dbg intrinsics while hoisting common code in the two blocks up into the branch block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63687 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-04 00:03:08 +00:00
Devang Patel
383d7ed915 Do not let dbg intrinsic block folding of two entry phi node. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63671 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-02-03 22:12:02 +00:00
Chris Lattner
1c2ad9ff86 fix a testcase. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62758 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-22 07:08:58 +00:00
Bill Wendling
c60fbcc133 Temporarily XFAIL until this can be looked at. r62557 is what caused it to start failing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62578 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-20 10:28:39 +00:00
Chris Lattner
63bf29b5b1 another fix for PR3354 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62561 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-20 01:15:41 +00:00
Chris Lattner
6ff645bf0f Fix a problem exposed by PR3354: simplifycfg was making a potentially 
trapping instruction be executed unconditionally.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62541 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-19 23:03:13 +00:00