From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/testsuite/gcc.target/sparc/globalreg-1.c | 54 ++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 gcc/testsuite/gcc.target/sparc/globalreg-1.c (limited to 'gcc/testsuite/gcc.target/sparc/globalreg-1.c') diff --git a/gcc/testsuite/gcc.target/sparc/globalreg-1.c b/gcc/testsuite/gcc.target/sparc/globalreg-1.c new file mode 100644 index 000000000..3839d9f13 --- /dev/null +++ b/gcc/testsuite/gcc.target/sparc/globalreg-1.c @@ -0,0 +1,54 @@ +/* { dg-do run } */ +/* { dg-options "-std=gnu99 -Os" } */ + +/* This is a massively distilled test case based upon + mm/memory.c:unmap_vmas() in the Linux kernel when compiled + on sparc64 for SMP which uses a global register as the + base of the per-cpu variable area. + + Because of a bug in global register handling in the dataflow + code, the loop-invariant pass would move 'expression(regval)' + outside of the loop. */ + +extern void exit(int); +extern void abort(void); + +register unsigned long regval __asm__("g6"); + +extern void cond_resched(void); + +unsigned int var; + +static unsigned long expression(unsigned long v) +{ + unsigned long ret; + + __asm__("" : "=r" (ret) : "0" (0)); + return ret + v; +} + +void func(unsigned long *pp) +{ + int i; + + for (i = 0; i < 56; i++) { + cond_resched(); + *pp = expression(regval); + } +} + +void __attribute__((noinline)) cond_resched(void) +{ + regval++; +} + +int main(void) +{ + unsigned long val; + + regval = 100; + func(&val); + if (val != 156) + abort(); + exit(0); +} -- cgit v1.2.3