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| author | Richard Biener <rguenther@suse.de> | 2021-01-27 15:35:52 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-01-28 09:14:46 +0100 |
| commit | a523add327c6cfdd68cf9b788ea808068d0f508c (patch) | |
| tree | 70405368b4b570d343d2a1b5b041beb8a3fd7ad3 /gcc/dse.c | |
| parent | fbe37371cf372b84d5b7f1a6f5f0971a513dd5fa (diff) | |
| download | gcc-a523add327c6cfdd68cf9b788ea808068d0f508c.zip gcc-a523add327c6cfdd68cf9b788ea808068d0f508c.tar.gz gcc-a523add327c6cfdd68cf9b788ea808068d0f508c.tar.bz2 | |
rtl-optimization/80960 - avoid creating garbage RTL in DSE
The following avoids repeatedly turning VALUE RTXen into
sth useful and re-applying a constant offset through get_addr
via DSE check_mem_read_rtx. Instead perform this once for
all stores to be visited in check_mem_read_rtx. This avoids
allocating 1.6GB of garbage PLUS RTXen on the PR80960
testcase, fixing the memory usage regression from old GCC.
2021-01-27 Richard Biener <rguenther@suse.de>
PR rtl-optimization/80960
* dse.c (check_mem_read_rtx): Call get_addr on the
offsetted address.
Diffstat (limited to 'gcc/dse.c')
| -rw-r--r-- | gcc/dse.c | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -2219,6 +2219,11 @@ check_mem_read_rtx (rtx *loc, bb_info_t bb_info) } if (maybe_ne (offset, 0)) mem_addr = plus_constant (get_address_mode (mem), mem_addr, offset); + /* Avoid passing VALUE RTXen as mem_addr to canon_true_dependence + which will over and over re-create proper RTL and re-apply the + offset above. See PR80960 where we almost allocate 1.6GB of PLUS + RTXen that way. */ + mem_addr = get_addr (mem_addr); if (group_id >= 0) { |