Matthew Poremba has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/65252?usp=email )
Change subject: gpu-compute: Add granulated SGPR computation for gfx9
......................................................................
gpu-compute: Add granulated SGPR computation for gfx9
The granulated SGPR size is used when the number of SGPRs is unknown.
The computation for this has changed since gfx8 and is commented as a
TODO in a comment.
This changeset implements the change and also checks for an invalid SGPR
count. According to LLVM code this could happen "due to a compiler bug
or when using inline asm.":
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AMDGPU/
AMDGPUAsmPrinter.cpp#L723
Change-Id: Ie487a53940b323a0002341075e0f81af4147a7d8
---
M src/gpu-compute/hsa_queue_entry.hh
1 file changed, 35 insertions(+), 3 deletions(-)
diff --git a/src/gpu-compute/hsa_queue_entry.hh
b/src/gpu-compute/hsa_queue_entry.hh
index 4261f2c..fbe0efe 100644
--- a/src/gpu-compute/hsa_queue_entry.hh
+++ b/src/gpu-compute/hsa_queue_entry.hh
@@ -96,9 +96,22 @@
if (!numVgprs)
numVgprs = (akc->granulated_workitem_vgpr_count + 1) * 4;
- // TODO: Granularity changes for GFX9!
- if (!numSgprs)
- numSgprs = (akc->granulated_wavefront_sgpr_count + 1) * 8;
+ if (!numSgprs || numSgprs ==
+
std::numeric_limits<decltype(akc->wavefront_sgpr_count)>::max()) {
+ // Supported major generation numbers: 0 (BLIT kernels), 8,
and 9
+ uint16_t version = akc->amd_machine_version_major;
+ assert((version == 0) || (version == 8) || (version == 9));
+ // SGPR allocation granularies:
+ // - GFX8: 8
+ // - GFX9: 16
+ // Source: https://llvm.org/docs/AMDGPUUsage.html
+ if ((version == 0) || (version == 8)) {
+ // We assume that BLIT kernels use the same granularity as
GFX8
+ numSgprs = (akc->granulated_wavefront_sgpr_count + 1) * 8;
+ } else if (version == 9) {
+ numSgprs = ((akc->granulated_wavefront_sgpr_count + 1) *
16)/2;
+ }
+ }
initialVgprState.reset();
initialSgprState.reset();
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: Ie487a53940b323a0002341075e0f81af4147a7d8
Gerrit-Change-Number: 65252
Gerrit-PatchSet: 1
Gerrit-Owner: Matthew Poremba <[email protected]>
Gerrit-MessageType: newchange
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