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[x86 testsuite] preserve full register across main

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This test uses a call-saved register as a global variable.  It
attempts to preserve its value across main, but only the lower int
part is preserved, which is not good enough for x86_64, when the
runtime that calls main() happens to hold something in the chosen
register that is not a zero-extension from the 32-bit value, and
rightfully expects the full register to remain unchanged when main()
returns.


for  gcc/testsuite/ChangeLog

	* gcc.target/i386/20020616-1.c: Preserve full register across
	main.

From-SVN: r275329
This commit is contained in:
Alexandre Oliva 2019-09-03 06:06:02 +00:00 committed by Alexandre Oliva
parent 97d6a7c80e
commit e4a8d4a7ec
2 changed files with 14 additions and 5 deletions
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5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2019-09-03 Alexandre Oliva <oliva@adacore.com>
* gcc.target/i386/20020616-1.c: Preserve full register across
main.
2019-09-02 Paul Thomas <pault@gcc.gnu.org>
PR fortran/91589

14
gcc/testsuite/gcc.target/i386/20020616-1.c
View File

@ -2,12 +2,16 @@
/* { dg-do run } */
/* { dg-options "-O2" } */
/* We need this type to be as wide as the register chosen below, so
that, when we preserve it across main, we preserve all of it. */
typedef int __attribute__ ((mode (__word__))) reg_type;
#if !__PIC__
register int k asm("%ebx");
register reg_type k asm("%ebx");
#elif __amd64
register int k asm("%r12");
register reg_type k asm("%r12");
#else
register int k asm("%esi");
register reg_type k asm("%esi");
#endif
void __attribute__((noinline))
@ -18,7 +22,7 @@ foo()
void test()
{
int i;
reg_type i;
for (i = 0; i < 10; i += k)
{
k = 0;
@ -28,7 +32,7 @@ void test()
int main()
{
int old = k;
reg_type old = k;
test();
k = old;
return 0;