[llvm] 9ece051 - [AMDGPU] Mark s_get_waveid_in_workgroup as not reading memory

[Jay Foad via llvm-commits]

Author: Jay Foad
Date: 2022-05-19T21:25:46+01:00
New Revision: 9ece0518471a28348324d05111f22f8143475715

URL: https://github.com/llvm/llvm-project/commit/9ece0518471a28348324d05111f22f8143475715
DIFF: https://github.com/llvm/llvm-project/commit/9ece0518471a28348324d05111f22f8143475715.diff

LOG: [AMDGPU] Mark s_get_waveid_in_workgroup as not reading memory

It is already marked as having side effects, at least in MIR. It does
not interact with anything else that is modelled as a memory access
either in IR or MachineIR.

Differential Revision: https://reviews.llvm.org/D125985

Added: 
    

Modified: 
    llvm/include/llvm/IR/IntrinsicsAMDGPU.td
    llvm/lib/Target/AMDGPU/SMInstructions.td

Removed: 
    


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diff  --git a/llvm/include/llvm/IR/IntrinsicsAMDGPU.td b/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
index 2777bffad0e2..59444c2cb423 100644
--- a/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
+++ b/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
@@ -1860,7 +1860,7 @@ def int_amdgcn_mov_dpp8 :
 def int_amdgcn_s_get_waveid_in_workgroup :
   GCCBuiltin<"__builtin_amdgcn_s_get_waveid_in_workgroup">,
   Intrinsic<[llvm_i32_ty], [],
-    [IntrReadMem, IntrInaccessibleMemOnly, IntrWillReturn]>;
+    [IntrNoMem, IntrHasSideEffects, IntrWillReturn]>;
 
 class AMDGPUGlobalAtomicRtn<LLVMType vt> : Intrinsic <
   [vt],

diff  --git a/llvm/lib/Target/AMDGPU/SMInstructions.td b/llvm/lib/Target/AMDGPU/SMInstructions.td
index 1765355510eb..d21f3d9a6fcc 100644
--- a/llvm/lib/Target/AMDGPU/SMInstructions.td
+++ b/llvm/lib/Target/AMDGPU/SMInstructions.td
@@ -235,7 +235,7 @@ class SM_WaveId_Pseudo<string opName, SDPatternOperator node> : SM_Pseudo<
   " $sdst", [(set i32:$sdst, (node))]> {
   let hasSideEffects = 1;
   let mayStore = 0;
-  let mayLoad = 1;
+  let mayLoad = 0;
   let has_sbase = 0;
 }