This is an optimisation that is recommended by Matt Arsenault,
and used by RadeonSI, but it's not compatible with Vulkan.
Note that AC_FLOAT_MODE_UNSAFE_FP_MATH includes the no signed
zeros flag in LLVM.
v2: - enable nsz with unsafe math
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
src/amd/common/ac_nir_to_llvm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 46bb4decab..6e95a6a84e 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -352,6 +352,9 @@ create_llvm_function(LLVMContextRef ctx, LLVMModuleRef
module,
LLVMAddTargetDependentFunctionAttr(main_function,
"unsafe-fp-math",
"true");
+ LLVMAddTargetDependentFunctionAttr(main_function,
+ "no-signed-zeros-fp-math",
+ "true");
}
return main_function;
}
--
2.15.1
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