ac: set new LLVM denormal flags

See: https://reviews.llvm.org/D71358

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4196>

diff --git a/src/amd/llvm/ac_llvm_build.c b/src/amd/llvm/ac_llvm_build.c
index 93e2e28..dcbd4ef 100644 (file)
--- a/src/amd/llvm/ac_llvm_build.c
+++ b/src/amd/llvm/ac_llvm_build.c
@@ -4984,6 +4984,15 @@ ac_build_main(const struct ac_shader_args *args,
        }
 
        ctx->main_function = main_function;
+
+       if (LLVM_VERSION_MAJOR >= 11) {
+               /* Enable denormals for FP16 and FP64: */
+               LLVMAddTargetDependentFunctionAttr(main_function, "denormal-fp-math",
+                                                  "ieee,ieee");
+               /* Disable denormals for FP32: */
+               LLVMAddTargetDependentFunctionAttr(main_function, "denormal-fp-math-f32",
+                                                  "preserve-sign,preserve-sign");
+       }
        return main_function;
 }