On 03/15/2017 01:59 AM, Matt Arsenault wrote:
On Mar 14, 2017, at 17:21, Samuel Pitoiset <samuel.pitoi...@gmail.com> wrote:
Initially this was a workaround for a bug introduced in LLVM 4.0
in the SimplifyCFG pass that caused image instrinsics to disappear
(because they were badly sunk). Finally, this is a win because it
decreases SGPR spilling and increases the number of waves a bit.
Although, shader-db results are good I think we might want to
remove it in the future once the issue is fixed. For now, enable
it for LLVM >= 4.0.
This also fixes a rendering issue with the speedometer in Dirt Rally.
More information can be found here https://reviews.llvm.org/D26348.
Thanks to Dave Airlie for the patch.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99484
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
For those interested, here's the full shader-db report:
https://hastebin.com/osepehehat.pas
src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c
b/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c
index 5c63b732b3..4fb7a126e4 100644
--- a/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c
+++ b/src/gallium/drivers/radeonsi/si_shader_tgsi_setup.c
@@ -40,6 +40,7 @@
#include <stdio.h>
#include <llvm-c/Transforms/IPO.h>
#include <llvm-c/Transforms/Scalar.h>
+#include <llvm-c/Support.h>
/* Data for if/else/endif and bgnloop/endloop control flow structures.
*/
@@ -124,6 +125,11 @@ static void init_amdgpu_target()
LLVMInitializeAMDGPUTarget();
LLVMInitializeAMDGPUTargetMC();
LLVMInitializeAMDGPUAsmPrinter();
+
+#if HAVE_LLVM >= 0x0400
+ const char *argv[2] = {"mesa", "-simplifycfg-sink-common=false"};
+ LLVMParseCommandLineOptions(2, argv, NULL);
+#endif
}
Probably should have a FIXME that this is a workaround and a link to an open
bug to really fix these issues
Okay, I will change it locally.
-Matt
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