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| author | Alan Modra <amodra@gmail.com> | 2016-05-09 22:05:25 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gcc.gnu.org> | 2016-05-09 22:05:25 +0930 |
| commit | a710b1d57408f46362f686413ca386a8f169004c (patch) | |
| tree | b815cf1264000d2a26af3b934534fb5a33189773 /gcc | |
| parent | 171f6f05db326f704e48375045aa2a98ea77675c (diff) | |
| download | gcc-a710b1d57408f46362f686413ca386a8f169004c.zip gcc-a710b1d57408f46362f686413ca386a8f169004c.tar.gz gcc-a710b1d57408f46362f686413ca386a8f169004c.tar.bz2 | |
[RS6000] Fragile testcase breaks with -frename-registers
PR testsuite/70826
* gcc.target/powerpc/savres.c: Compile with -fno-rename-registers.
From-SVN: r236033
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/savres.c | 22 |
2 files changed, 25 insertions, 2 deletions
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 9e97454..ebb70e9 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -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 diff --git a/gcc/testsuite/gcc.target/powerpc/savres.c b/gcc/testsuite/gcc.target/powerpc/savres.c index f472f23..f724f30 100644 --- a/gcc/testsuite/gcc.target/powerpc/savres.c +++ b/gcc/testsuite/gcc.target/powerpc/savres.c @@ -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; |