diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_misc.cpp | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp index 5fe697346fe..1a47bab7e47 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp +++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp @@ -692,7 +692,20 @@ lp_build_create_jit_compiler_for_module(LLVMExecutionEngineRef *OutJIT, * when not using MCJIT so no instructions are generated which the old JIT * can't handle. Not entirely sure if we really need to do anything yet. */ -#if defined(PIPE_ARCH_LITTLE_ENDIAN) && defined(PIPE_ARCH_PPC_64) + +#ifdef PIPE_ARCH_PPC_64 + /* + * Large programs, e.g. gnome-shell and firefox, may tax the addressability + * of the Medium code model once dynamically generated JIT-compiled shader + * programs are linked in and relocated. Yet the default code model as of + * LLVM 8 is Medium or even Small. + * The cost of changing from Medium to Large is negligible: + * - an additional 8-byte pointer stored immediately before the shader entrypoint; + * - change an add-immediate (addis) instruction to a load (ld). + */ + builder.setCodeModel(CodeModel::Large); + +#if PIPE_ARCH_LITTLE_ENDIAN /* * Versions of LLVM prior to 4.0 lacked a table entry for "POWER8NVL", * resulting in (big-endian) "generic" being returned on @@ -705,6 +718,7 @@ lp_build_create_jit_compiler_for_module(LLVMExecutionEngineRef *OutJIT, if (MCPU == "generic") MCPU = "pwr8"; #endif +#endif builder.setMCPU(MCPU); if (gallivm_debug & (GALLIVM_DEBUG_IR | GALLIVM_DEBUG_ASM | GALLIVM_DEBUG_DUMP_BC)) { debug_printf("llc -mcpu option: %s\n", MCPU.str().c_str()); |