testsuite: Add test for #14257

Subscribers: rwbarton, thomie, duog

GHC Trac Issues: #14257

Differential Revision: https://phabricator.haskell.org/D4201

testsuite/tests/profiling/should_run/Makefile

@@ -33,3 +33,11 @@ T11489:
 	# then continue to run and exit normally.
 	# Caused a segmentation fault in GHC <= 7.10.3
 	./T11489 +RTS -hr{} -hc
+
+.PHONY: T14257
+T14257:
+	$(RM) T14257
+	"$(TEST_HC)" -O2 --make -prof -v0 -fprof-auto T14257.hs
+	./T14257 +RTS -hc
+	# Make sure that samples are monotonically increasing
+	awk 'BEGIN{t=0} /BEGIN_SAMPLE/{if ($$2 < t) print "uh oh", $$t, $$0; t=$$2;}' T14257.hp

testsuite/tests/profiling/should_run/T14257.hs

+{-# LANGUAGE ScopedTypeVariables #-}
+module Main where
+
+eval :: forall a b. (a -> b -> b) -> b -> [a] -> b
+eval f b xs = load xs []
+  where
+    load :: [a] -> [a] -> b
+    load [] stk          = unload b stk
+    load (x:xs) stk      = load xs (x : stk)
+
+    unload :: b -> [a] -> b
+    unload  v []         = v
+    unload  v (x  : stk) = unload ((f $! x) $! v) stk
+
+main :: IO ()
+main = print (eval (||) False (True : replicate 10000000 False))

testsuite/tests/profiling/should_run/T14257.stdout

+True

testsuite/tests/profiling/should_run/all.T

@@ -132,3 +132,5 @@ test('toplevel_scc_1',
      [''])
 
 test('T12962', [], compile_and_run, [''])
+
+test('T14257', [], run_command, ['$MAKE -s --no-print-directory T14257'])