Preston Gurd c7b902e7fe Pad Short Functions for Intel Atom ... The current Intel Atom microarchitecture has a feature whereby when a function returns early then it is slightly faster to execute a sequence of NOP instructions to wait until the return address is ready, as opposed to simply stalling on the ret instruction until the return address is ready. When compiling for X86 Atom only, this patch will run a pass, called "X86PadShortFunction" which will add NOP instructions where less than four cycles elapse between function entry and return. It includes tests. This patch has been updated to address Nadav's review comments - Optimize only at >= O1 and don't do optimization if -Os is set - Stores MachineBasicBlock* instead of BBNum - Uses DenseMap instead of std::map - Fixes placement of braces Patch by Andy Zhang. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171879 91177308-0d34-0410-b5e6-96231b3b80d8		2013-01-08 18:27:24 +00:00
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ARM	Allow the asm printer to print fp128 values properly.	2013-01-08 16:56:23 +00:00
CPP	test commit	2012-07-18 17:53:05 +00:00
Generic	After reducing the size of an operation in the DAG we zero-extend the reduced	2012-12-19 07:39:08 +00:00
Hexagon	In hexagon convertToHardwareLoop, don't deref end() iterator	2012-12-07 21:03:15 +00:00
MBlaze
Mips	[mips] MipsTargetLowering::getSetCCResultType should return a vector type if	2013-01-04 20:06:01 +00:00
MSP430	Add support for varargs functions for msp430.	2012-11-21 17:28:27 +00:00
NVPTX	[NVPTX] Fix crash with unnamed struct arguments	2012-12-05 20:50:28 +00:00
PowerPC	Allow the asm printer to print fp128 values properly.	2013-01-08 16:56:23 +00:00
R600	DAGCombiner: Avoid generating illegal vector INT_TO_FP nodes	2013-01-02 22:13:01 +00:00
SI	Add R600 backend	2012-12-11 21:25:42 +00:00
SPARC	Use TargetTransformInfo to control switch-to-lookup table transformation	2012-10-30 11:23:25 +00:00
Thumb	Use the 'count' attribute to calculate the upper bound of an array.	2012-12-04 21:34:03 +00:00
Thumb2	On some ARM cpus, flags setting movs with shifter operand, i.e. lsl, lsr, asr,	2012-12-20 19:59:30 +00:00
X86	Pad Short Functions for Intel Atom	2013-01-08 18:27:24 +00:00
XCore	Fix handling of aliases to functions.	2012-11-16 21:12:38 +00:00