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24 Commits

Author SHA1 Message Date
Chandler Carruth d5639ff80f Add a test case for PR14233. 
llvm-svn: 167224
 2012-11-01 10:26:36 +00:00
Chris Lattner 6a144a2227 Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. 
llvm-svn: 145171
 2011-11-27 06:54:59 +00:00
Chris Lattner 59345c8b65 remove asmparser support for the old getresult instruction, which has been subsumed by extractvalue. 
llvm-svn: 133247
 2011-06-17 06:57:15 +00:00
Owen Anderson 99c985c37d Fix PR8247: JumpThreading can cause a block to become unreachable while still having predecessor, if it is part of a self-loop. 
Because of this, we cannot use the Simplify* APIs, as they can assert-fail on unreachable code.  Since it's not easy to determine
if a given threading will cause a block to become unreachable, simply defer simplifying simplification to later InstCombine and/or
DCE passes.

llvm-svn: 115082
 2010-09-29 20:34:41 +00:00
Owen Anderson a5e6b3eca4 Merge 2010-08-31-InfiniteRecursion.ll into crash.ll. 
llvm-svn: 112635
 2010-08-31 20:27:17 +00:00
Chris Lattner 3c603024bb Fix PR7755: knowing something about an inval for a pred 
from the LHS should disable reconsidering that pred on the
RHS.  However, knowing something about the pred on the RHS
shouldn't disable subsequent additions on the RHS from
happening.

llvm-svn: 111349
 2010-08-18 03:14:36 +00:00
Owen Anderson bb4c4b59a4 Fix a test with malformed IR. Not sure why this didn't fail before. 
llvm-svn: 109422
 2010-07-26 18:44:56 +00:00
Chris Lattner 19eff2a9f6 Fix PR7647, handling the case when 'To' ends up being 
mutated by recursive simplification.  This also enhances
ReplaceAndSimplifyAllUses to actually do a real RAUW
at the end of it, which updates any value handles
pointing to "From" to start pointing to "To".  This
seems useful for debug info and random other VH users.

llvm-svn: 108415
 2010-07-15 06:36:08 +00:00
Chris Lattner bbc25ff5cc if jump threading is able to infer interesting values on both 
the LHS and RHS of an and/or instruction, don't multiply add
known predecessor values.  This fixes the crash on testcase
from PR7498

llvm-svn: 108114
 2010-07-12 00:47:34 +00:00
Chris Lattner 329ea064ed jump threading can't split a critical edge from an indirectbr. This 
fixes PR7356.

llvm-svn: 105950
 2010-06-14 19:45:43 +00:00
Chris Lattner 9ae28b141f fix PR6743, a case where we'd delete an instruction before using it 
in some cases.

llvm-svn: 100937
 2010-04-10 18:26:57 +00:00
Chris Lattner 6fbfe5897c fix PR6305 by handling BlockAddress in a helper function 
called by jump threading.

llvm-svn: 96263
 2010-02-15 20:47:49 +00:00
Chris Lattner 29b15c5cfd third bug from PR6119: the xor dupe extension allows 
for arbitrary terminators in predecessors, don't assume
it is a conditional or uncond branch.  The testcase shows
an example where they can happen with switches.

llvm-svn: 94323
 2010-01-23 19:21:31 +00:00
Chris Lattner ba2d0b89ff add an early out to ProcessBranchOnXOR to speed it up, 
handle the case when we can infer an input to the xor
from all inputs that agree, instead of going into an
infinite loop.  Another part of PR6199

llvm-svn: 94321
 2010-01-23 19:16:25 +00:00
Chris Lattner de5ab4860f fix a crash in jump threading, PR6119 
llvm-svn: 94319
 2010-01-23 18:56:07 +00:00
Chris Lattner 6d6f10fe91 fix PR5698 
llvm-svn: 90708
 2009-12-06 17:17:23 +00:00
Chris Lattner 3c9aca9079 fix PR5640 by tracking whether a block is the header of a loop more 
precisely, which prevents us from infinitely peeling the loop.

llvm-svn: 90211
 2009-12-01 06:04:43 +00:00
Chris Lattner 5ff7f5672e reapply 86289, 86278, 86270, 86267, 86266 & 86264 plus a fix 
(making pred factoring only happen if threading is guaranteed
to be successful).

This now survives an X86-64 bootstrap of llvm-gcc.

llvm-svn: 86355
 2009-11-07 08:05:03 +00:00
Devang Patel 3a42e7ac65 Revert following patches to fix llvmgcc bootstrap. 
86289, 86278, 86270, 86267, 86266 & 86264
Chris, please take a look.

llvm-svn: 86321
 2009-11-07 01:32:59 +00:00
Chris Lattner a8b9ce3f07 Fix a problem discovered on self host. 
llvm-svn: 86278
 2009-11-06 19:21:48 +00:00
Chris Lattner 046dff7acf merge a few crash tests into crash.ll 
llvm-svn: 86119
 2009-11-05 05:57:34 +00:00
Chris Lattner 7f903681ac alternate fix for PR5258 which avoids worklist problems, with reduced testcase. 
llvm-svn: 84667
 2009-10-20 20:27:49 +00:00
Chris Lattner 4140d8bd5c another testcase jump threading shouldn't crash on. 
llvm-svn: 83758
 2009-10-11 07:11:11 +00:00
Chris Lattner ece16f2335 rename a file, remove a poorly reduced testcase. 
llvm-svn: 83757
 2009-10-11 07:10:28 +00:00