[Mesa-dev] [PATCH] gallivm: set LLVMNoUnwindAttribute on all intrinsics

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

RadeonSI stats: Mostly 0% difference, but Valley shows a small improvement:

 Application            Files    SGPRs     VGPRs   SpillSGPR SpillVGPR Code Size    LDS    Max Waves   Waits
 unigine_valley           278    0.00 %   -0.29 %    0.00 %    0.00 %    0.01 %    0.00 %    0.17 %    0.00 %
---
 src/gallium/auxiliary/gallivm/lp_bld_intr.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_intr.c b/src/gallium/auxiliary/gallivm/lp_bld_intr.c
index 0a8f996..f12e735 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_intr.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_intr.c
@@ -145,8 +145,10 @@ lp_build_intrinsic(LLVMBuilderRef builder,
 
       function = lp_declare_intrinsic(module, name, ret_type, arg_types, num_args);
 
-      if (attr)
-          LLVMAddFunctionAttr(function, attr);
+      /* NoUnwind indicates that the intrinsic never raises a C++ exception.
+       * Set it for all intrinsics.
+       */
+      LLVMAddFunctionAttr(function, attr | LLVMNoUnwindAttribute);
 
       if (gallivm_debug & GALLIVM_DEBUG_IR) {
          lp_debug_dump_value(function);
-- 
2.7.4