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[PeepholeOptimizer] Enable the advanced copy optimization by default.

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The advanced copy optimization does not yield any difference on the whole llvm
test-suite + SPECs, either in compile time or runtime (binaries are identical),
but has a big potential when data go back and forth between register files as
demonstrated with test/CodeGen/ARM/adv-copy-opt.ll.

Note: This was measured for both Os and O3 for armv7s, arm64, and x86_64.

<rdar://problem/12702965>

llvm-svn: 216236
This commit is contained in:
Quentin Colombet 2014-08-21 22:23:52 +00:00
parent 27065e1dff
commit 0bee8352b0
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/PeepholeOptimizer.cpp
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@ -94,7 +94,7 @@ DisablePeephole("disable-peephole", cl::Hidden, cl::init(false),
cl::desc("Disable the peephole optimizer"));
static cl::opt<bool>
DisableAdvCopyOpt("disable-adv-copy-opt", cl::Hidden, cl::init(true),
DisableAdvCopyOpt("disable-adv-copy-opt", cl::Hidden, cl::init(false),
cl::desc("Disable advanced copy optimization"));
STATISTIC(NumReuse, "Number of extension results reused");