gallium/radeon: re-enable unsafe math for graphics shaders

This reverts commit 4db985a5fa9ea985616a726b1770727309502d81.

The grass no longer disappears, which was the reason the commit was reverted.
This might affect tessellation. We'll see.

Totals from affected shaders:
SGPRS: 151672 -> 150232 (-0.95 %)
VGPRS: 90620 -> 89776 (-0.93 %)
Code Size: 3980472 -> 3920836 (-1.50 %) bytes
LDS: 67 -> 67 (0.00 %) blocks
Scratch: 1357824 -> 1202176 (-11.46 %) bytes per wave

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

diff --git a/src/gallium/drivers/radeon/radeon_llvm_emit.c b/src/gallium/drivers/radeon/radeon_llvm_emit.c
index 973d6edff8a2c2ce8638f4f0e8cda9a79891c8df..c442c6566dc6466544e1e5b203ab2a40ee1e092b 100644 (file)
--- a/src/gallium/drivers/radeon/radeon_llvm_emit.c
+++ b/src/gallium/drivers/radeon/radeon_llvm_emit.c
@@ -82,6 +82,10 @@ void radeon_llvm_shader_type(LLVMValueRef F, unsigned type)
        sprintf(Str, "%1d", llvm_type);
 
        LLVMAddTargetDependentFunctionAttr(F, "ShaderType", Str);
+
+       if (type != TGSI_PROCESSOR_COMPUTE) {
+               LLVMAddTargetDependentFunctionAttr(F, "unsafe-fp-math", "true");
+       }
 }
 
 static void init_r600_target()