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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158259 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll b/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll
index c141551..382ba1f 100644
--- a/test/CodeGen/PowerPC/2007-05-22-tailmerge-3.ll
+++ b/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"