#5576: Fix to #5549 breaks integerConstantFolding
----------------------------------+-----------------------------------------
Reporter: daniel.is.fischer | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
----------------------------------+-----------------------------------------
The fix to #5549 makes `integerConstantFolding` break (on x86 and x86_64
linux at least).
{{{
=====> integerConstantFolding(normal) 1229 of 3047 [3, 4, 0]
cd ./lib/integer && $MAKE -s --no-print-directory integerConstantFolding
</dev/null >integerConstantFolding.run.stdout
2>integerConstantFolding.run.stderr
Actual stdout output differs from expected:
--- ./lib/integer/integerConstantFolding.stdout 2011-09-26
12:57:40.214838002 +0200
+++ ./lib/integer/integerConstantFolding.run.stdout 2011-10-22
14:00:27.814342001 +0200
@@ -1,3 +1,10 @@
+Unfolded values found
+lvl9_r2gC = __integer 100060
+lvl13_r2gH = __integer 100059
+quotRemInteger didn't constant fold
+quotRemInteger didn't constant fold
+divModInteger didn't constant fold
+divModInteger didn't constant fold
plusInteger: 200007
timesInteger: 683234160
minusIntegerN: -991
*** unexpected failure for integerConstantFolding(normal)
}}}
On x86_64, building without
changeset:ca380cd19530fad4860e42844e42a473188e0013 makes `T5549` fail,
{{{
bytes allocated 12228725064 is more than maximum allowed 8000000000
*** unexpected failure for T5549(normal)
}}}
On x86 linux, T5549 fails with too good stats
(3362960220 allocated, less than minimum allowed 5000000000 for current
HEAD, 3362960124 for ghc-7.3.20110913, HEAD without ca380cd currently
building). The patch doesn't make much difference there for the test case,
apparently (seems to make a difference on x86/Darwin, though?).
Can we get good constant folding without losing too much sharing?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5576>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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