Accuracy of some operations was recently improved in the R600 backend,
at the cost of slower code. This is required for compute shaders,
but not for graphics shaders. Add unsafe-fp-math hint to make LLVM
generate faster but possibly less accurate code.
Piglit didn't indicate any regressions.
---
src/gallium/drivers/radeon/radeon_llvm_emit.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/gallium/drivers/radeon/radeon_llvm_emit.c
b/src/gallium/drivers/radeon/radeon_llvm_emit.c
index 1b17dd4..171ccaa 100644
--- a/src/gallium/drivers/radeon/radeon_llvm_emit.c
+++ b/src/gallium/drivers/radeon/radeon_llvm_emit.c
@@ -26,6 +26,7 @@
#include "radeon_llvm_emit.h"
#include "radeon_elf_util.h"
#include "util/u_memory.h"
+#include "pipe/p_shader_tokens.h"
#include <llvm-c/Target.h>
#include <llvm-c/TargetMachine.h>
@@ -50,6 +51,10 @@ void radeon_llvm_shader_type(LLVMValueRef F, unsigned type)
sprintf(Str, "%1d", type);
LLVMAddTargetDependentFunctionAttr(F, "ShaderType", Str);
+
+ if (type != TGSI_PROCESSOR_COMPUTE) {
+ LLVMAddTargetDependentFunctionAttr(F, "unsafe-fp-math", "true");
+ }
}
static void init_r600_target() {
--
1.8.3.2
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