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| author | Hal Finkel <hfinkel@anl.gov> | 2012-06-09 03:14:50 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2012-06-09 03:14:50 +0000 |
| commit | eb50c2d4a49941b58711d98e7e0d7e30fbcd90d8 (patch) | |
| tree | 42aa201ecc4e99c5859916e4c7c3326235c886db /llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll | |
| parent | 091b87bb9dc20e7c2cec4ee43bc0647e47bd557a (diff) | |
| download | bcm5719-llvm-eb50c2d4a49941b58711d98e7e0d7e30fbcd90d8.tar.gz bcm5719-llvm-eb50c2d4a49941b58711d98e7e0d7e30fbcd90d8.zip | |
Enable tail merging on PPC.
Tail merging had been disabled on PPC because it would disturb bundling decisions
made during pre-RA scheduling on the 970 cores. Now, however, all bundling decisions
are made during post-RA scheduling, and tail merging is generally beneficial (the
average test-suite speedup is insignificantly positive).
Largest test-suite speedups:
MultiSource/Benchmarks/mediabench/gsm/toast/toast - 30%
MultiSource/Benchmarks/BitBench/uuencode/uuencode - 23%
SingleSource/Benchmarks/Shootout-C++/ary - 21%
SingleSource/Benchmarks/Stanford/Queens - 17%
Largest slowdowns:
MultiSource/Benchmarks/MiBench/security-sha/security-sha - 24%
MultiSource/Benchmarks/McCat/03-testtrie/testtrie - 22%
MultiSource/Applications/JM/ldecod/ldecod - 14%
MultiSource/Benchmarks/mediabench/g721/g721encode/encode - 9%
This is improved by using full (instead of just critical) anti-dependency breaking,
but doing so still causes miscompiles and so cannot yet be enabled by default.
llvm-svn: 158259
Diffstat (limited to 'llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll b/llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll index c1415510d05..382ba1f6a82 100644 --- a/llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll +++ b/llvm/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll @@ -1,8 +1,8 @@ -; RUN: llc < %s -march=ppc32 | grep bl.*baz | count 2 -; RUN: llc < %s -march=ppc32 | grep bl.*quux | count 2 -; RUN: llc < %s -march=ppc32 -enable-tail-merge | grep bl.*baz | count 1 -; RUN: llc < %s -march=ppc32 -enable-tail-merge=1 | grep bl.*quux | count 1 -; Check that tail merging is not the default on ppc, and that -enable-tail-merge works. +; RUN: llc < %s -march=ppc32 -enable-tail-merge=0 | grep bl.*baz | count 2 +; RUN: llc < %s -march=ppc32 -enable-tail-merge=0 | grep bl.*quux | count 2 +; RUN: llc < %s -march=ppc32 | grep bl.*baz | count 1 +; RUN: llc < %s -march=ppc32 | grep bl.*quux | count 1 +; Check that tail merging is the default on ppc, and that -enable-tail-merge works. ; ModuleID = 'tail.c' target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64" |
