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[RS6000] Fragile testcase breaks with -frename-registers

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PR testsuite/70826
	* gcc.target/powerpc/savres.c: Compile with -fno-rename-registers.

From-SVN: r236033
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Alan Modra 2016-05-09 22:05:25 +09:30 committed by Alan Modra
parent 171f6f05db
commit a710b1d574
2 changed files with 25 additions and 2 deletions
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5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-05-09 Alan Modra <amodra@gmail.com>
PR testsuite/70826
* gcc.target/powerpc/savres.c: Compile with -fno-rename-registers.
2016-05-09 Richard Biener <rguenther@suse.de>
PR tree-optimization/70985

22
gcc/testsuite/gcc.target/powerpc/savres.c
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@ -1,5 +1,5 @@
/* { dg-do run } */
/* { dg-options "-fno-inline -fomit-frame-pointer" } */
/* { dg-options "-fno-inline -fomit-frame-pointer -fno-rename-registers" } */
/* { dg-additional-options "-mdynamic-no-pic" { target *-*-darwin* } } */
/* -fno-inline -maltivec -m32/-m64 -mmultiple/no-multiple -Os/-O2. */
@ -10,6 +10,13 @@
#define SET_GPR(R,V) SET (long, R, V)
#define SET_FPR(R,V) SET (double, R, V)
#define SET_VR(R,V) SET (__attribute__ ((vector_size (16))) int, R, V)
/* There doesn't seem to be a way of letting gcc know that cr2, cr3
and cr4 are being used, and therefore should not be touched by
gcc. Unlike gpr, fpr and vr we can't do something like
register __attribute__ ((__mode__ ("__CC__"))) int cr2 __asm__ ("cr2");
This makes the test somewhat fragile, dependent on gcc not using
any of cr2, cr3 and cr4 in main(), and is why -fno-rename-registers
is required. */
#define SET_CR(R,V) __asm__ __volatile__ ("mtcrf %0,%1" : : "n" (1<<(7-R)), "r" (V<<(4*(7-R))) : "cr" #R)
#define TRASH_GPR(R) SET_GPR (R, 0)
#define TRASH_FPR(R) SET_FPR (R, 0)
@ -1063,7 +1070,18 @@ void ws_0 (void)
abort ();
}
int main (void)
/* We'd like to compile main with
__attribute__ ((__optimize__ ("fixed-cr2,fixed-cr3,fixed-cr4")))
but that doesn't do anything currently. Obviously we don't want to
compile the whole file with -ffixed-cr2 -ffixed-cr3 -ffixed-cr4 as
that would also tell gcc not to save/restore cr, and we're trying
to check that the above functions do save/restore cr.
__attribute__ ((__optimize__ ("no-rename-registers,omit-frame-pointer")))
works, but it seems odd to need omit-frame-pointer and raises the
question of whether darwin would need -mdynamic-no-pic.
So for now use -fno-rename-registers over the whole test. */
int
main (void)
{
INIT_REGS;
USE_ALL_CR;