Compiling HEAD with perf-llvm, (3.4.2) and running the nofib suite fails at the wave4main case. It is not clear to me whether wave4main should always produce the same output (and so the test fails because it does not do so) or whether the numbers generated depend on some feature of the build settings, or OS.

HC = /Users/xxx/Projects/ghc/inplace/bin/ghc-stage2
HC_OPTS = -O2 -Rghc-timing -H32m -hisuf hi -cpp -fglasgow-exts -rtsopts
RUNTEST_OPTS = -ghc-timing
==nofib== wave4main: size of wave4main follows...
__TEXT	__DATA	__OBJC	others	dec	hex
4091904	450560	0	4295947176	4300489640	1005443a8
==nofib== wave4main: time to run wave4main follows...
../../../runstdtest/runstdtest ./wave4main  -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3  -ghc-timing     4000;   ../../../runstdtest/runstdtest ./wave4main  -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3  -ghc-timing     4000;   ../../../runstdtest/runstdtest ./wave4main  -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3  -ghc-timing     4000;   ../../../runstdtest/runstdtest ./wave4main  -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3  -ghc-timing     4000;   ../../../runstdtest/runstdtest ./wave4main  -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3  -ghc-timing     4000;

real	0m0.217s
user	0m0.191s
sys	0m0.011s
././wave4main 4000 < /dev/null
expected stdout not matched by reality
--- wave4main.stdout	2014-07-08 20:57:14.000000000 +0100
+++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest16932.1	2014-07-13 13:43:22.000000000 +0100
@@ -1 +1 @@
-69923/1465
+69096/1465

real	0m0.197s
user	0m0.186s
sys	0m0.008s
././wave4main 4000 < /dev/null
expected stdout not matched by reality
--- wave4main.stdout	2014-07-08 20:57:14.000000000 +0100
+++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest16961.1	2014-07-13 13:43:22.000000000 +0100
@@ -1 +1 @@
-69923/1465
+69096/1465

real	0m0.201s
user	0m0.189s
sys	0m0.009s
././wave4main 4000 < /dev/null
expected stdout not matched by reality
--- wave4main.stdout	2014-07-08 20:57:14.000000000 +0100
+++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17011.1	2014-07-13 13:43:22.000000000 +0100
@@ -1 +1 @@
-69923/1465
+69096/1465

real	0m0.201s
user	0m0.190s
sys	0m0.008s
././wave4main 4000 < /dev/null
expected stdout not matched by reality
--- wave4main.stdout	2014-07-08 20:57:14.000000000 +0100
+++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17051.1	2014-07-13 13:43:23.000000000 +0100
@@ -1 +1 @@
-69923/1465
+69096/1465

real	0m0.200s
user	0m0.189s
sys	0m0.009s
././wave4main 4000 < /dev/null
expected stdout not matched by reality
--- wave4main.stdout	2014-07-08 20:57:14.000000000 +0100
+++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17080.1	2014-07-13 13:43:23.000000000 +0100
@@ -1 +1 @@
-69923/1465
+69096/1465
make: *** [runtests] Error 1