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[hsa] Do not ICE when regallocating function with zero pseudoregisters
- From: Martin Jambor <mjambor at suse dot cz>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 25 Feb 2015 17:00:08 +0100
- Subject: [hsa] Do not ICE when regallocating function with zero pseudoregisters
- Authentication-results: sourceware.org; auth=none
Hi,
the new HSA register allocator ICEs when it tries to resize a vector
to zero length, which is something that our vectors do not take well,
when it processes a simple function which just returns a constant and
does not actually use any registers.
Fixed thusly, committed to the hsa branch after rudimentary testing.
Thanks,
Martin
2015-02-25 Martin Jambor <mjambor@suse.cz>
* hsa-regalloc.c (regalloc): Bail out if there are no registers.
diff --git a/gcc/hsa-regalloc.c b/gcc/hsa-regalloc.c
index 94c88dc..8f0b4bb 100644
--- a/gcc/hsa-regalloc.c
+++ b/gcc/hsa-regalloc.c
@@ -745,6 +745,10 @@ regalloc (void)
basic_block bb;
reg_class_desc classes[4];
+ /* If there are no registers used in the function, exit right away. */
+ if (hsa_cfun.reg_count == 0)
+ return;
+
memset (classes, 0, sizeof (classes));
classes[0].next_avail = 0;
classes[0].max_num = 7;