llvm-6502

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History

Sanjay Patel 3deb3e32b2 critical-anti-dependency breaker: don't use reg def info from kill insts (PR20308)

In PR20308 ( http://llvm.org/bugs/show_bug.cgi?id=20308 ), the critical-anti-dependency breaker
caused a miscompile because it broke a WAR hazard using a register that it thinks is available
based on info from a kill inst. Until PR18663 is solved, we shouldn't use any def/use info from
a kill because they are really just nops.

This patch adds guard checks for kills around calls to ScanInstruction() where the DefIndices
array is set. For good measure, add an assert in ScanInstruction() so we don't hit this bug again.

The test case is a reduced version of the code from the bug report.

Differential Revision: http://reviews.llvm.org/D4977



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216114 91177308-0d34-0410-b5e6-96231b3b80d8

2014-08-20 18:03:00 +00:00

Analysis

Answer to Philip Reames comments

2014-08-18 22:18:14 +00:00

AsmParser

Split parseAssembly into parseAssembly and parseAssemblyInto.

2014-08-19 22:05:47 +00:00

Bitcode

BitcodeReader: Only create one basic block for each blockaddress

2014-08-16 01:54:37 +00:00

CodeGen

critical-anti-dependency breaker: don't use reg def info from kill insts (PR20308)