diff options
| author | Nick Clifton <nickc@redhat.com> | 2003-01-20 18:59:43 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2003-01-20 18:59:43 +0000 |
| commit | e32894124dc9860e977b8ebe23b9b21a2ca066ec (patch) | |
| tree | 964485e9f01270d98d7b1fc07b65f9917509b03f /gcc | |
| parent | 120cdf68d5dbc7b2819d7e97a26acf4436bb66f8 (diff) | |
| download | gcc-e32894124dc9860e977b8ebe23b9b21a2ca066ec.zip gcc-e32894124dc9860e977b8ebe23b9b21a2ca066ec.tar.gz gcc-e32894124dc9860e977b8ebe23b9b21a2ca066ec.tar.bz2 | |
Add an UNSPEC_PROLOGUE_USE to prevent the link register from being considered dead.
Add a testcase for the bug fixed by this patch.
From-SVN: r61509
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/arm/arm.md | 8 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/20030117-1.c | 23 |
4 files changed, 41 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ff97b31..c75ddc7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2003-01-20 Nick Clifton <nickc@redhat.com> + + * config/arm/arm.md (sibcall_epilogue): Add an + UNSPEC_PROLOGUE_USE to prevent the link register from being + considered dead. + Mon Jan 20 14:36:23 CET 2003 Jan Hubicka <jh@suse.cz> * i386.md (SSE cmov splitter): Handle memory operand in operand 5. diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md index b7a09ce..40f956e 100644 --- a/gcc/config/arm/arm.md +++ b/gcc/config/arm/arm.md @@ -8430,8 +8430,14 @@ " ) +;; Note - although unspec_volatile's USE all hard registers, +;; USEs are ignored after relaod has completed. Thus we need +;; to add an unspec of the link register to ensure that flow +;; does not think that it is unused by the sibcall branch that +;; will replace the standard function epilogue. (define_insn "sibcall_epilogue" - [(unspec_volatile [(const_int 0)] VUNSPEC_EPILOGUE)] + [(parallel [(unspec:SI [(reg:SI LR_REGNUM)] UNSPEC_PROLOGUE_USE) + (unspec_volatile [(return)] VUNSPEC_EPILOGUE)])] "TARGET_ARM" "* if (USE_RETURN_INSN (FALSE)) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 79e76c0..3f53ca4 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2003-01-20 Nick Clifton <nickc@redhat.com> + + * gcc.c-torture/execute/20030117-1.c: New test case. Exposes + problem with ARM sibcall code generation. + 2003-01-20 Kazu Hirata <kazu@cs.umass.edu> * gcc.c-torture/execute/20030120-1.c: New. diff --git a/gcc/testsuite/gcc.c-torture/execute/20030117-1.c b/gcc/testsuite/gcc.c-torture/execute/20030117-1.c new file mode 100644 index 0000000..656bd61 --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/20030117-1.c @@ -0,0 +1,23 @@ +int foo (int, int, int); +int bar (int, int, int); + +int main (void) +{ + if (foo (5, 10, 21) != 12) + abort (); + + if (bar (9, 12, 15) != 150) + abort (); + + exit (0); +} + +int foo (int x, int y, int z) +{ + return (x + y + z) / 3; +} + +int bar (int x, int y, int z) +{ + return foo (x * x, y * y, z * z); +} |