Bill Schmidt 89e88e30bf This patch addresses an incorrect transformation in the DAG combiner. ... The included test case is derived from one of the GCC compatibility tests. The problem arises after the selection DAG has been converted to type-legalized form. The combiner first sees a 64-bit load that can be converted into a pre-increment form. The original load feeds into a SRL that isolates the upper 32 bits of the loaded doubleword. This looks like an opportunity for DAGCombiner::ReduceLoadWidth() to replace the 64-bit load with a 32-bit load. However, this transformation is not valid, as the replacement load is not a pre-increment load. The pre-increment load produces an extra result, which feeds a subsequent add instruction. The replacement load only has one result value, and this value is propagated to all uses of the pre- increment load, including the add. Because the add is looking for the second result value as its operand, it ends up attempting to add a constant to a token chain, resulting in a crash. So the patch simply disables this transformation for any load with more than two result values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172480 91177308-0d34-0410-b5e6-96231b3b80d8		2013-01-14 22:04:38 +00:00
..
Analysis	Make opt grab the triple from the module and use it to initialize the target machine.	2013-01-01 08:00:32 +00:00
Archive
Assembler
Bindings/Ocaml
Bitcode
BugPoint
CodeGen	This patch addresses an incorrect transformation in the DAG combiner.	2013-01-14 22:04:38 +00:00
DebugInfo	Add the C testcase to this file.	2013-01-08 03:03:14 +00:00
ExecutionEngine
Feature	There was a switch fall-through in the parser for textual LLVM that caused	2013-01-07 13:32:38 +00:00
FileCheck
Instrumentation	[msan] Change va_start/va_copy shadow memset alignment to 8.	2013-01-10 22:36:33 +00:00
Integer
JitListener
Linker	Fix a copy/paste error in the IR Linker, casting an ArrayType instead of a VectorType.	2013-01-10 10:49:36 +00:00
MC	This patch tackles the problem of parsing Mips	2013-01-12 01:03:14 +00:00
Object	[llvm-objdump] Emit addresses with the correct number of leading 0's.	2013-01-10 22:40:50 +00:00
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Transforms	SCEVExpander fix. RAUW needs to update the InsertedExpressions cache.	2013-01-14 21:00:37 +00:00
Unit
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