From: Marek Olšák Date: Sat, 3 Jun 2017 11:59:03 +0000 (+0200) Subject: radeonsi: do EarlyCSEMemSSA LLVM pass X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=257b538fd2e48666d5daf7bc5394c8d0a977fedf;p=mesa.git radeonsi: do EarlyCSEMemSSA LLVM pass so that LLVM IR looks like CSE has been run on it. It's also recommended by the instruction combining pass. This also fixes: - GL45-CTS.arrays_of_arrays_gl.InteractionFunctionCalls2 (crash) - piglit/spec/arb_shader_ballot/execution/fs-readFirstInvocation-uint-loop (fail) The code size decrease is positive, the register usage isn't. There is a decrease in VGPR spilling for Tomb Raider, but increase in DiRT Showdown and GRID Autosport. EarlyCSEMemSSA has a -0.01% change in code size compared EarlyCSE. SGPRS: 1935420 -> 1938076 (0.14 %) VGPRS: 1645504 -> 1645988 (0.03 %) Spilled SGPRs: 2493 -> 2651 (6.34 %) Spilled VGPRs: 107 -> 115 (7.48 %) Private memory VGPRs: 1332 -> 1332 (0.00 %) Scratch size: 1512 -> 1516 (0.26 %) dwords per thread Code Size: 61981592 -> 61890012 (-0.15 %) bytes Max Waves: 371847 -> 371798 (-0.01 %) Reviewed-by: Nicolai Hähnle --- diff --git a/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c b/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c index 1f8e91343f9..802e2b94e9e 100644 --- a/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c +++ b/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c @@ -1451,6 +1451,8 @@ void si_llvm_optimize_module(struct si_shader_context *ctx) LLVMAddLICMPass(gallivm->passmgr); LLVMAddAggressiveDCEPass(gallivm->passmgr); LLVMAddCFGSimplificationPass(gallivm->passmgr); + /* This is recommended by the instruction combining pass. */ + LLVMAddEarlyCSEMemSSAPass(gallivm->passmgr); LLVMAddInstructionCombiningPass(gallivm->passmgr); /* Run the pass */