Ulrich Weigand c791b42454 [SystemZ] Fix wrong-code generation for certain always-false conditions ...

We've found another bug in the code generation logic conditions for a
certain class of always-false conditions, those of the form
   if ((a & 1) < 0)

These only reach the back end when compiling without optimization.

The bug was introduced by the choice of using TEST UNDER MASK
to implement a check for
   if ((a & MASK) < VAL)
as
   if ((a & MASK) == 0)

where VAL is less than the the lowest bit of MASK.  This is correct
in all cases except for VAL == 0, in which case the original
condition is always false, but the replacement isn't.

Fixed by excluding that particular case.

llvm-svn: 259381

2016-02-01 18:31:19 +00:00

..

Analysis

[BasicAA] Fix for missing must alias (D16343)

2016-01-30 05:52:53 +00:00

Assembler

Fix constant folding of constant vector GEPs with undef or null as pointer argument.

2016-01-19 16:34:31 +00:00

Bindings

Deprecate a few C APIs.

2015-12-18 23:46:42 +00:00

Bitcode

[llvm-bcanalyzer] Dump bitcode wrapper header

2016-01-29 05:55:09 +00:00

BugPoint

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CodeGen

[SystemZ] Fix wrong-code generation for certain always-false conditions

2016-02-01 18:31:19 +00:00

DebugInfo

[codeview] Begin to add support for inlined call sites

2016-01-29 18:16:43 +00:00

Examples

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ExecutionEngine

[RuntimeDyld][MachO] Fix handling of empty eh-frame sections.

2016-01-28 22:35:48 +00:00

Feature

MachineScheduler: Honor optnone functions in the pre-ra scheduler.

2016-01-20 22:38:25 +00:00

FileCheck

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Instrumentation

[sanitizer] [msan] Fix origin store of array types

2016-01-11 19:55:27 +00:00

Integer

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JitListener

Fix several accidental DOS line endings in source files

2016-01-03 17:22:03 +00:00

LibDriver

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Linker

[ThinLTO] Find all needed metadata when linking metadata as postpass

2016-01-25 22:04:56 +00:00

LTO

[LTO] Restore original linkage of externals prior to splitting

2016-01-18 23:24:54 +00:00

MC

[X86][AVX512VBMI] add encoding and intrinsics for Multishift

2016-02-01 15:48:21 +00:00

Object

Fix identify_magic() to check that a file that starts with MH_MAGIC is

2016-01-26 23:43:37 +00:00

Other

Recommit r256952 "Filtering IR printing for print-after-all/print-before-all"

2016-01-06 22:55:03 +00:00

SymbolRewriter

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TableGen

[llvm-tblgen] Stop emitting the intrinsic name matching code

2016-01-26 23:01:21 +00:00

tools

[dsymutil] Support scattered relocs.

2016-02-01 03:44:22 +00:00

Transforms

fix broken check lines

2016-02-01 17:46:18 +00:00

Unit

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Verifier

Add a "gc-transition" operand bundle

2016-01-20 19:50:25 +00:00

YAMLParser

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.clang-format

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CMakeLists.txt

Introduce sanstats tool and llvm::CreateSanitizerStatReport function.

2016-01-16 00:31:11 +00:00

lit.cfg

Introduce sanstats tool and llvm::CreateSanitizerStatReport function.

2016-01-16 00:31:11 +00:00

lit.site.cfg.in

Make WinCOFFObjectWriter.cpp's timestamp writing not use ENABLE_TIMESTAMPS

2016-01-06 19:05:19 +00:00

TestRunner.sh

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