runtime/vm/compiler.cc - Issue 12218181: Recognize pattern (a << b) & c with c being a positive Smi and allow left shift to truncate the res…

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Unified Diff: runtime/vm/compiler.cc

Issue 12218181: Recognize pattern (a << b) & c with c being a positive Smi and allow left shift to truncate the res… (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/

Patch Set: Created 7 years, 10 months ago

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Index: runtime/vm/compiler.cc

===================================================================

--- runtime/vm/compiler.cc (revision 18843)

+++ runtime/vm/compiler.cc (working copy)

@@ -178,6 +178,12 @@

optimizer.ApplyICData();

DEBUG_ASSERT(flow_graph->VerifyUseLists());

+ // Optimize (a << b) & c patterns. Must occur before

+ // 'SelectRepresentations' which inserts conversion nodes.

+ // TODO(srdjan): Moved before inlining until environment use list can

+ // be used to detect when shift-left is outside the scope of bit-and.

+ optimizer.TryOptimizeLeftShiftWithBitAndPattern();

// Inlining (mutates the flow graph)

if (FLAG_use_inlining) {

TimerScope timer(FLAG_compiler_stats,

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