It's recommended by the instruction combining pass, and
RadeonSI also runs it. The code size should decrease but
the number of register might increase a little bit.
Though, after comparing the shader stats with DOW3, it
appears that the number of registers has been decreased and
it gives a very minor boost (~+1%).
It also improves the raytracing Vulkan demo, 233->245 FPS
and doesn't seem to affect any other demos.
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
src/amd/common/ac_nir_to_llvm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 11ba487f37..a700c0c875 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -6168,6 +6168,10 @@ static void ac_llvm_finalize_module(struct
nir_to_llvm_context * ctx)
LLVMAddLICMPass(passmgr);
LLVMAddAggressiveDCEPass(passmgr);
LLVMAddCFGSimplificationPass(passmgr);
+#if HAVE_LLVM >= 0x0400
+ /* This is recommended by the instruction combining pass. */
+ LLVMAddEarlyCSEMemSSAPass(passmgr);
+#endif
LLVMAddInstructionCombiningPass(passmgr);
/* Run the pass */
--
2.14.2
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
