I've committed this fix for an ICE compiling sollve_vv testcase
test_target_teams_distribute_defaultmap.c.
Somehow the optimizers result in a vector reduction on a vector of
duplicated constants. This was a case the backend didn't handle, so we
ended up with an unrecognised instruction ICE.
It might be better if constant reductions were evaluated at compile
time, but this patch prevents the ICE right now.
Andrew
P.S. I'll backport this to OG11 shortly.
amdgcn: Allow vector reductions on constants
Obviously it would be better if these reductions could be evaluated at compile
time, but this will avoid an ICE.
gcc/ChangeLog:
* config/gcn/gcn.cc (gcn_expand_reduc_scalar): Use force_reg.
diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index 74819c6e4d7..402f0256411 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -4460,7 +4460,7 @@ gcn_expand_reduc_scalar (machine_mode mode, rtx src, int
unspec)
pair of lanes, then on every pair of results from the previous
iteration (thereby effectively reducing every 4 lanes) and so on until
all lanes are reduced. */
- rtx in, out = src;
+ rtx in, out = force_reg (mode, src);
for (int i = 0, shift = 1; i < 6; i++, shift <<= 1)
{
rtx shift_val = gen_rtx_CONST_INT (VOIDmode, shift);
