On Mon, Jun 13, 2016 at 06:27:02PM +0200, Marek Olšák wrote:
> From: Marek Olšák <marek.ol...@amd.com>
>
> ---
> src/gallium/drivers/radeon/r600_pipe_common.c | 1 +
> src/gallium/drivers/radeon/r600_pipe_common.h | 1 +
> src/gallium/drivers/radeonsi/si_shader.c | 16 ++++++++++++++++
> 3 files changed, 18 insertions(+)
>
> diff --git a/src/gallium/drivers/radeon/r600_pipe_common.c
> b/src/gallium/drivers/radeon/r600_pipe_common.c
> index fa9f70d..5d4a679 100644
> --- a/src/gallium/drivers/radeon/r600_pipe_common.c
> +++ b/src/gallium/drivers/radeon/r600_pipe_common.c
> @@ -482,6 +482,7 @@ static const struct debug_named_value
> common_debug_options[] = {
> { "sisched", DBG_SI_SCHED, "Enable LLVM SI Machine Instruction
> Scheduler." },
> { "mono", DBG_MONOLITHIC_SHADERS, "Use old-style monolithic shaders
> compiled on demand" },
> { "noce", DBG_NO_CE, "Disable the constant engine"},
> + { "unsafemath", DBG_UNSAFE_MATH, "Enable unsafe math shader
> optimizations" },
>
> DEBUG_NAMED_VALUE_END /* must be last */
> };
> diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h
> b/src/gallium/drivers/radeon/r600_pipe_common.h
> index 77dfc4f..263ef5e 100644
> --- a/src/gallium/drivers/radeon/r600_pipe_common.h
> +++ b/src/gallium/drivers/radeon/r600_pipe_common.h
> @@ -99,6 +99,7 @@
> #define DBG_SI_SCHED (1llu << 46)
> #define DBG_MONOLITHIC_SHADERS (1llu << 47)
> #define DBG_NO_CE (1llu << 48)
> +#define DBG_UNSAFE_MATH (1llu << 49)
>
> #define R600_MAP_BUFFER_ALIGNMENT 64
> #define R600_MAX_VIEWPORTS 16
> diff --git a/src/gallium/drivers/radeonsi/si_shader.c
> b/src/gallium/drivers/radeonsi/si_shader.c
> index 6dc4985..bba6a55 100644
> --- a/src/gallium/drivers/radeonsi/si_shader.c
> +++ b/src/gallium/drivers/radeonsi/si_shader.c
> @@ -5255,6 +5255,22 @@ static void si_create_function(struct
> si_shader_context *ctx,
> else
> LLVMAddAttribute(P, LLVMInRegAttribute);
> }
> +
> + if (ctx->screen->b.debug_flags & DBG_UNSAFE_MATH) {
> + /* These were copied from some LLVM test. */
> + LLVMAddTargetDependentFunctionAttr(ctx->radeon_bld.main_fn,
> + "less-precise-fpmad",
> + "true");
> + LLVMAddTargetDependentFunctionAttr(ctx->radeon_bld.main_fn,
> + "no-infs-fp-math",
> + "true");
> + LLVMAddTargetDependentFunctionAttr(ctx->radeon_bld.main_fn,
> + "no-nans-fp-math",
> + "true");
> + LLVMAddTargetDependentFunctionAttr(ctx->radeon_bld.main_fn,
> + "unsafe-fp-math",
> + "true");
> + }
You may get better results by also adding the fast-math flags to the
individual floating-point instructions, but this would be a more
invasive change.
-Tom
> }
>
> static void create_meta_data(struct si_shader_context *ctx)
> --
> 2.7.4
>
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