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Author SHA1 Message Date
Lang Hames 98c3c0f38a [X86] Add comments to clarify some non-obvious lines in the stackmap-nops.ll 
testcases.

Based on code review from Philip Reames. Thanks Philip!

llvm-svn: 213923
 2014-07-25 04:50:08 +00:00
Lang Hames f49bc3f1b1 [X86] Optimize stackmap shadows on X86. 
This patch minimizes the number of nops that must be emitted on X86 to satisfy
stackmap shadow constraints.

To minimize the number of nops inserted, the X86AsmPrinter now records the
size of the most recent stackmap's shadow in the StackMapShadowTracker class,
and tracks the number of instruction bytes emitted since the that stackmap
instruction was encountered. Padding is emitted (if it is required at all)
immediately before the next stackmap/patchpoint instruction, or at the end of
the basic block.

This optimization should reduce code-size and improve performance for people
using the llvm stackmap intrinsic on X86.

<rdar://problem/14959522>

llvm-svn: 213892
 2014-07-24 20:40:55 +00:00
Andrew Trick e8cba373a3 Grow the stackmap/patchpoint format to hold 64-bit IDs. 
llvm-svn: 197255
 2013-12-13 18:37:10 +00:00
Juergen Ributzka 17e0d9ee6c [Stackmap] Emit multi-byte nops for X86. 
llvm-svn: 196334
 2013-12-04 00:39:08 +00:00