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| author | Andrew Stubbs <ams@codesourcery.com> | 2019-11-22 16:43:46 +0000 |
|---|---|---|
| committer | Andrew Stubbs <ams@gcc.gnu.org> | 2019-11-22 16:43:46 +0000 |
| commit | 86b0eb81837f4912d3f10bcfad35086cc54a1841 (patch) | |
| tree | d2a9341b5406cfed636e4526e22d88506408cef7 /gcc/config | |
| parent | d2f8402a0886db2b2d33ed09e51cf27cc85db5e4 (diff) | |
| download | gcc-86b0eb81837f4912d3f10bcfad35086cc54a1841.zip gcc-86b0eb81837f4912d3f10bcfad35086cc54a1841.tar.gz gcc-86b0eb81837f4912d3f10bcfad35086cc54a1841.tar.bz2 | |
Limit LDS usage.
2019-11-22 Andrew Stubbs <ams@codesourcery.com>
gcc/
* config/gcn/gcn.c (OMP_LDS_SIZE): Define.
(ACC_LDS_SIZE): Define.
(OTHER_LDS_SIZE): Define.
(LDS_SIZE): Redefine using above.
(gcn_expand_prologue): Initialize m0 with LDS_SIZE-1.
From-SVN: r278622
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/gcn/gcn.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c index 3a8c10e..f85d84b 100644 --- a/gcc/config/gcn/gcn.c +++ b/gcc/config/gcn/gcn.c @@ -70,10 +70,15 @@ int gcn_isa = 3; /* Default to GCN3. */ worker-single mode to worker-partitioned mode), per workgroup. Global analysis could calculate an exact bound, but we don't do that yet. - We reserve the whole LDS, which also prevents any other workgroup - sharing the Compute Unit. */ + We want to permit full occupancy, so size accordingly. */ -#define LDS_SIZE 65536 +#define OMP_LDS_SIZE 0x600 /* 0x600 is 1/40 total, rounded down. */ +#define ACC_LDS_SIZE 32768 /* Half of the total should be fine. */ +#define OTHER_LDS_SIZE 65536 /* If in doubt, reserve all of it. */ + +#define LDS_SIZE (flag_openacc ? ACC_LDS_SIZE \ + : flag_openmp ? OMP_LDS_SIZE \ + : OTHER_LDS_SIZE) /* The number of registers usable by normal non-kernel functions. The SGPR count includes any special extra registers such as VCC. */ @@ -2876,8 +2881,11 @@ gcn_expand_prologue () /* Ensure that the scheduler doesn't do anything unexpected. */ emit_insn (gen_blockage ()); + /* m0 is initialized for the usual LDS DS and FLAT memory case. + The low-part is the address of the topmost addressable byte, which is + size-1. The high-part is an offset and should be zero. */ emit_move_insn (gen_rtx_REG (SImode, M0_REG), - gen_int_mode (LDS_SIZE, SImode)); + gen_int_mode (LDS_SIZE-1, SImode)); emit_insn (gen_prologue_use (gen_rtx_REG (SImode, M0_REG))); |