Mainline Regression in gcc.target/i386/pr32268.c

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Mainline Regression in gcc.target/i386/pr32268.c
\ Kaveh R. GHAZI (16 Feb 2008)
. \ Richard Guenther (16 Feb 2008)
. . \ Uros Bizjak (16 Feb 2008)
. . . \ Richard Guenther (16 Feb 2008)
. . . . \ Andrew Pinski (16 Feb 2008)
. \ Kaveh R. Ghazi (16 Feb 2008)
. . \ Richard Guenther (16 Feb 2008)
. \ Kaveh R. Ghazi (16 Feb 2008)
. . \ Richard Guenther (16 Feb 2008)

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Subject:	Mainline Regression in gcc.target/i386/pr32268.c
Group:	Gcc
From:	Kaveh R. GHAZI
Date:	16 Feb 2008

Hi Uros,

This broke on x86_64 in the last day or so, I thought maybe you might know
what happened. (You touched config/i386 FP stuff recently.) I'm seeing a
regression in gcc.target/i386/pr32268.c as seen here:
http://gcc.gnu.org/ml/gcc-testresults/2008-02/msg01108.html

Right now the execute failures only appear with -fpic/-fPIC, however I
believe this is because inlining is masking the problem and allowing
things to get folded. With -fpic/-fPIC the inlining is disabled and the
abort occurs.

You can trigger the bug in a regular pass by applying the following
noinline patch to the testcase. Thoughts?

Thanks,
--Kaveh

diff -rup orig/egcc-SVN20080216/gcc/testsuite/gcc.target/i386/pr32268.c egcc-SVN20080216/gcc/testsuite/gcc.target/i386/pr32268.c
--- orig/egcc-SVN20080216/gcc/testsuite/gcc.target/i386/pr32268.c 2007-12-31 19:11:58.000000000 +0100
+++ egcc-SVN20080216/gcc/testsuite/gcc.target/i386/pr32268.c 2008-02-16 18:34:04.000000000 +0100
@@ -4,12 +4,14 @@

extern void abort(void);

-int test_lt(__float128 x, __float128 y)
+int __attribute__ ((__noinline__))
+test_lt(__float128 x, __float128 y)
{
return x < y;
}

-int test_gt (__float128 x, __float128 y)
+int __attribute__ ((__noinline__))
+test_gt (__float128 x, __float128 y)
{
return x > y;
}