Michael Gottesman c024f3258a Teach simplify-cfg how to correctly create covered lookup tables for switches on iN with N >= 3. ... One optimization simplify-cfg performs is the converting of switches to lookup tables if the switch has > 4 cases. This is done by: 1. Finding the max/min case value and calculating the switch case range. 2. Create a lookup table basic block. 3. Perform a check in the switch's BB to see if the input value is in the switch's case range. If the input value satisfies said predicate branch to the lookup table BB, otherwise branch to the switch's default destination BB using the default value as the result. The conditional check consists of subtracting the min case value of the table from any input iN value and then ensuring that said value is unsigned less than the size of the lookup table represented as an iN value. If the lookup table is a covered lookup table, the size of the table will be N which is 0 as an iN value. Thus the comparison will be an `icmp ult` of an iN value against 0 which is always false yielding the incorrect result. This patch fixes this problem by recognizing if we have a covered lookup table and if we do, unconditionally jumps to the lookup table BB since the covering property of the lookup table implies no input values could not be handled by said BB. rdar://15268442 llvm-svn: 193045		2013-10-20 07:04:37 +00:00
clang	Sema: Diagnose global replacement functions declared as inline	2013-10-20 05:40:29 +00:00
clang-tools-extra	Refactoring transform-specific options	2013-10-17 17:57:36 +00:00
compiler-rt	[asan] fix stack trace printing on Mac	2013-10-18 17:46:43 +00:00
debuginfo-tests	don't use CHECK-NEXT because it may be on the same line.	2013-09-18 23:01:54 +00:00
libclc	Port pocl's gen_convert.py script to libclc	2013-10-10 19:09:01 +00:00
libcxx	r192075 broke the buildbot at	2013-10-14 18:02:02 +00:00
libcxxabi	unwinder: conditionalise availability	2013-10-17 03:57:41 +00:00
lld	Simplify WinLinkDriver. No functionality change.	2013-10-19 03:34:00 +00:00
lldb	ValueObject and SBValue's GetChildMemberWithName should look through anonymous structs	2013-10-18 23:53:55 +00:00
llvm	Teach simplify-cfg how to correctly create covered lookup tables for switches on iN with N >= 3.	2013-10-20 07:04:37 +00:00
openmp	Update web pages to include style sheets and referenced documents missed before.	2013-10-03 11:55:28 +00:00
polly	clang-format: No empty line after 'public:'	2013-10-15 14:41:02 +00:00