6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-15 04:30:12 +00:00
Code Issues Projects Releases Wiki Activity
43ffcc571c
llvm-6502/test/Transforms
History
Chandler Carruth 92ffb676af Disable transforms that introduce calls to exp10*() on Linux due to 
widespread glibc bugs.

The glibc implementation of exp10 has a very serious precision bug in
version 2.15 (and older versions). This is still very widely used (the
current Ubuntu LTS for example uses it) and so it isn't reasonable to
make transforms that produce these functions. This fixes many
miscompiles introduced when we started transforming pow(10.0, ...) into
exp10, and it may have fixed other latent miscompiles where exp10
provided sufficient precision but exp10f did not.

This is all really horrible. The primary bug has been fixed for over
a year and glibc 2.18 works correctly for the test cases I have, but it
will be 2017 before the LTS using 2.15 is no longer supported by Ubuntu
(and thus reasonable for folks to be relying on). =[ We're either going
to need to live without these optimizations, or find a way to switch
behavior more dynamically than using simply the fact that the OS is
"Linux".

To make matters worse, there appears to be significant testing and
fixing of numerous other bugs in the exp10 family of functions right now
in glibc. While those haven't been causing problems I've seen in the
wild, it gives me concerns that we may need to wait until an even later
release of glibc before we can reliably transform code into exp10.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198093 91177308-0d34-0410-b5e6-96231b3b80d8
2013-12-28 02:40:19 +00:00
..
ADCE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ArgumentPromotion ArgumentPromotion: correctly transfer TBAA tags and alignments. 2013-11-15 20:41:15 +00:00
BBVectorize Prevent LoopVectorizer and SLPVectorizer running if the target has no vector registers. 2013-09-18 12:43:35 +00:00
BranchFolding
CodeExtractor [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
CodeGenPrepare [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ConstantMerge Corruptly merge constants with explicit and implicit alignments. 2013-11-12 20:21:43 +00:00
ConstProp Teach ConstantFolding about pointer address spaces 2013-08-20 21:20:04 +00:00
CorrelatedValuePropagation [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
DeadArgElim Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
DeadStoreElimination Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
DebugIR Use right pointer type in DebugIR 2013-09-27 22:26:25 +00:00
EarlyCSE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
FunctionAttrs [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
GCOVProfiling Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
GlobalDCE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
GlobalOpt Fix a use-after-free error in GlobalOpt CleanupConstantGlobalUsers 2013-12-12 20:45:24 +00:00
GVN Fix PR17952. 2013-11-11 22:00:23 +00:00
IndVarSimplify Add support to indvars for optimizing sadd.with.overflow. 2013-12-23 23:31:49 +00:00
Inline [inliner] Fix PR18206 by preventing inlining functions that call setjmp 2013-12-13 08:00:01 +00:00
InstCombine Disable transforms that introduce calls to exp10*() on Linux due to 2013-12-28 02:40:19 +00:00
InstSimplify Add a test that large offsets on GEPs on 32 bits targets are handled correctly. 2013-09-28 21:27:49 +00:00
Internalize Correct word hyphenations 2013-12-05 05:44:44 +00:00
IPConstantProp [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
JumpThreading Don't eliminate a partially redundant load if it's in a landing pad. 2013-10-21 04:09:17 +00:00
LCSSA [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LICM Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
LoopDeletion [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LoopIdiom Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
LoopReroll Add a loop rerolling pass 2013-11-16 23:59:05 +00:00
LoopRotate Rename test with misspelt filename 2013-12-02 04:31:36 +00:00
LoopSimplify UpdatePHINodes in BasicBlockUtils should not crash on duplicate predecessors 2013-10-04 23:41:05 +00:00
LoopStrengthReduce Fix "existant" typos 2013-10-29 02:35:28 +00:00
LoopUnroll Implement TTI getUnrollingPreferences for PowerPC 2013-09-11 21:20:40 +00:00
LoopUnswitch [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LoopVectorize LoopVectorizer: Don't if-convert constant expressions that can trap 2013-12-17 01:11:01 +00:00
LowerAtomic [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerExpectIntrinsic [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerInvoke [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerSwitch Revert patches to add case-range support for PR1255. 2013-09-09 19:14:35 +00:00
Mem2Reg Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
MemCpyOpt [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
MergeFunc PR17925 bugfix. 2013-11-26 16:11:03 +00:00
MetaRenamer [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ObjCARC Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
PhaseOrdering [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
PruneEH [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
Reassociate [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
Reg2Mem [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SampleProfile llvm/test/Transforms/SampleProfile/syntax.ll: Relax an expression, not to check locale-dependent message. 2013-12-03 02:20:53 +00:00
Scalarizer Fix Scalarizer insertion point when replacing PHIs with insertelements 2013-12-23 14:51:56 +00:00
ScalarRepl Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
SCCP [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SimplifyCFG Transforms: Don't create bad weights when eliminating dead cases 2013-12-20 08:21:30 +00:00
Sink [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SLPVectorizer SLPVectorizer: An in-tree vectorized entry cannot also be a scalar external use 2013-12-05 15:14:40 +00:00
SROA Fix an issue where SROA computed different results based on the relative 2013-11-19 09:03:18 +00:00
StripSymbols Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
StructurizeCFG StructurizeCFG: Fix verification failure with some loops. 2013-11-22 19:24:39 +00:00
TailCallElim [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
TailDup [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00