libguile/vm-i-system.c: workaround ice ssa corruption while compiling with option -g -O
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While compiling with option -g -O, there was a ssa corruption:
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..
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Unable to coalesce ssa_names 48 and 3476 which are marked as MUST COALESCE.
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sp_48(ab) and sp_3476(ab)
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guile-2.0.11/libguile/vm-engine.c: In function 'vm_debug_engine':
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guile-2.0.11/libguile/vm.c:673:19: internal compiler error: SSA corruption
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#define VM_NAME vm_debug_engine
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^
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guile-2.0.11/libguile/vm-engine.c:39:1: note: in expansion of macro 'VM_NAME'
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VM_NAME (SCM vm, SCM program, SCM *argv, int nargs)
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^
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Please submit a full bug report,
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with preprocessed source if appropriate.
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See <http://gcc.gnu.org/bugs.html> for instructions.
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...
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Tweak libguile/vm-i-system.c to add boundary value check to workaround it.
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Upstream-Status: Pending
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Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
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Fixes Buildroot autobuilder failures on AArch64.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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libguile/vm-i-system.c | 20 ++++++++++++++++----
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1 file changed, 16 insertions(+), 4 deletions(-)
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diff --git a/libguile/vm-i-system.c b/libguile/vm-i-system.c
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--- a/libguile/vm-i-system.c
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+++ b/libguile/vm-i-system.c
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@@ -625,10 +625,22 @@ VM_DEFINE_INSTRUCTION (47, bind_optionals_shuffle, "bind-optionals/shuffle", 6,
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/* now shuffle up, from walk to ntotal */
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{
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scm_t_ptrdiff nshuf = sp - walk + 1, i;
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- sp = (fp - 1) + ntotal + nshuf;
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- CHECK_OVERFLOW ();
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- for (i = 0; i < nshuf; i++)
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- sp[-i] = walk[nshuf-i-1];
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+ /* check the value of nshuf to workaround ice ssa corruption */
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+ /* while compiling with -O -g */
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+ if (nshuf > 0)
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+ {
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+ sp = (fp - 1) + ntotal + nshuf;
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+ CHECK_OVERFLOW ();
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+ for (i = 0; i < nshuf; i++)
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+ sp[-i] = walk[nshuf-i-1];
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+ }
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+ else
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+ {
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+ sp = (fp - 1) + ntotal + nshuf;
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+ CHECK_OVERFLOW ();
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+ for (i = 0; i < nshuf; i++)
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+ sp[-i] = walk[nshuf-i-1];
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+ }
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}
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/* and fill optionals & keyword args with SCM_UNDEFINED */
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while (walk <= (fp - 1) + ntotal)
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--
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1.9.1
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