radeonsi: Allow dumping LLVM IR before optimization passes

Set R600_DEBUG=preoptir to dump the LLVM IR before optimization passes,
to allow diagnosing problems caused by optimization passes.

Note that in order to compile the resulting IR with llc, you will first
have to run at least the mem2reg pass, e.g.

opt -mem2reg -S < shader.ll | llc -march=amdgcn -mcpu=bonaire

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> (original patch)
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com> (w/ debug flag)
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeon/r600_pipe_common.c b/src/gallium/drivers/radeon/r600_pipe_common.c
index c827dbd1b8fbff5b3381ba1f48b84fc4f6116ce5..a1432ed63cc5a5d691d4e53e5bf0e0bb3931ac0c 100644 (file)
--- a/src/gallium/drivers/radeon/r600_pipe_common.c
+++ b/src/gallium/drivers/radeon/r600_pipe_common.c
@@ -393,6 +393,7 @@ static const struct debug_named_value common_debug_options[] = {
        { "noir", DBG_NO_IR, "Don't print the LLVM IR"},
        { "notgsi", DBG_NO_TGSI, "Don't print the TGSI"},
        { "noasm", DBG_NO_ASM, "Don't print disassembled shaders"},
+       { "preoptir", DBG_PREOPT_IR, "Print the LLVM IR before initial optimizations" },
 
        /* features */
        { "nodma", DBG_NO_ASYNC_DMA, "Disable asynchronous DMA" },

diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h b/src/gallium/drivers/radeon/r600_pipe_common.h
index c7e4c445797cfe9fbd04faafa20ba4d8fc40040b..4e366311c308965871632cdeb79107359b58182a 100644 (file)
--- a/src/gallium/drivers/radeon/r600_pipe_common.h
+++ b/src/gallium/drivers/radeon/r600_pipe_common.h
@@ -71,6 +71,7 @@
 #define DBG_NO_IR              (1 << 12)
 #define DBG_NO_TGSI            (1 << 13)
 #define DBG_NO_ASM             (1 << 14)
+#define DBG_PREOPT_IR          (1 << 15)
 /* Bits 21-31 are reserved for the r600g driver. */
 /* features */
 #define DBG_NO_ASYNC_DMA       (1llu << 32)

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 8b524cf4ada3b6060369aafb3ea46b71ad794b5d..d9ed6b234e0d0596bb77c1bddbe69c2cb3fa6c21 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -4092,7 +4092,7 @@ int si_compile_llvm(struct si_screen *sscreen,
        if (r600_can_dump_shader(&sscreen->b, processor)) {
                fprintf(stderr, "radeonsi: Compiling shader %d\n", count);
 
-               if (!(sscreen->b.debug_flags & DBG_NO_IR))
+               if (!(sscreen->b.debug_flags & (DBG_NO_IR | DBG_PREOPT_IR)))
                        LLVMDumpModule(mod);
        }
 
@@ -4178,6 +4178,12 @@ static int si_generate_gs_copy_shader(struct si_screen *sscreen,
        si_llvm_export_vs(bld_base, outputs, gsinfo->num_outputs);
 
        LLVMBuildRetVoid(bld_base->base.gallivm->builder);
+
+       /* Dump LLVM IR before any optimization passes */
+       if (sscreen->b.debug_flags & DBG_PREOPT_IR &&
+           r600_can_dump_shader(&sscreen->b, TGSI_PROCESSOR_GEOMETRY))
+               LLVMDumpModule(bld_base->base.gallivm->module);
+
        radeon_llvm_finalize_module(&si_shader_ctx->radeon_bld);
 
        if (dump)
@@ -4385,9 +4391,15 @@ int si_shader_create(struct si_screen *sscreen, LLVMTargetMachineRef tm,
        }
 
        LLVMBuildRetVoid(bld_base->base.gallivm->builder);
+       mod = bld_base->base.gallivm->module;
+
+       /* Dump LLVM IR before any optimization passes */
+       if (sscreen->b.debug_flags & DBG_PREOPT_IR &&
+           r600_can_dump_shader(&sscreen->b, si_shader_ctx.type))
+               LLVMDumpModule(mod);
+
        radeon_llvm_finalize_module(&si_shader_ctx.radeon_bld);
 
-       mod = bld_base->base.gallivm->module;
        r = si_compile_llvm(sscreen, &shader->binary, &shader->config, tm,
                            mod, debug, si_shader_ctx.type);
        if (r) {