[llvm] AMDGPU: Remove incorrect uses of SubtaretPredicate around DS_Reals (PR #85001)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Changpeng Fang (changpeng)

<details>
<summary>Changes</summary>

  SubtargetPredicate is copied from DS_Pseudo to DS_Real. We should not use another SubtargetPredicate around DS_Real, because doing this will override the predicate from DS_Pseudo.

  For examle, for DS_ADD_RTN_F64, SubtargetPredicate was set to HasLdsAtomicAddF64 in Pseudo. And it will be overriden to isGFX90APlus if we assign isGFX90APlus to SubtargetPredicate in Real definition.

---
Full diff: https://github.com/llvm/llvm-project/pull/85001.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/DSInstructions.td (+9-11) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/DSInstructions.td b/llvm/lib/Target/AMDGPU/DSInstructions.td
index 87ace01a6d0e56..b869a1a12f5d29 100644
--- a/llvm/lib/Target/AMDGPU/DSInstructions.td
+++ b/llvm/lib/Target/AMDGPU/DSInstructions.td
@@ -1735,14 +1735,12 @@ def DS_WRITE_B128_vi      : DS_Real_vi<0xdf, DS_WRITE_B128>;
 def DS_READ_B96_vi        : DS_Real_vi<0xfe, DS_READ_B96>;
 def DS_READ_B128_vi       : DS_Real_vi<0xff, DS_READ_B128>;
 
-let SubtargetPredicate = isGFX90APlus in {
-  def DS_ADD_F64_vi     : DS_Real_vi<0x5c, DS_ADD_F64>;
-  def DS_ADD_RTN_F64_vi : DS_Real_vi<0x7c, DS_ADD_RTN_F64>;
-} // End SubtargetPredicate = isGFX90APlus
-
-let SubtargetPredicate = isGFX940Plus in {
-  def DS_PK_ADD_F16_vi     : DS_Real_vi<0x17, DS_PK_ADD_F16>;
-  def DS_PK_ADD_RTN_F16_vi : DS_Real_vi<0xb7, DS_PK_ADD_RTN_F16>;
-  def DS_PK_ADD_BF16_vi     : DS_Real_vi<0x18, DS_PK_ADD_BF16>;
-  def DS_PK_ADD_RTN_BF16_vi : DS_Real_vi<0xb8, DS_PK_ADD_RTN_BF16>;
-} // End SubtargetPredicate = isGFX940Plus
+// GFX90A
+def DS_ADD_F64_vi     : DS_Real_vi<0x5c, DS_ADD_F64>;
+def DS_ADD_RTN_F64_vi : DS_Real_vi<0x7c, DS_ADD_RTN_F64>;
+
+// GFX940
+def DS_PK_ADD_F16_vi     : DS_Real_vi<0x17, DS_PK_ADD_F16>;
+def DS_PK_ADD_RTN_F16_vi : DS_Real_vi<0xb7, DS_PK_ADD_RTN_F16>;
+def DS_PK_ADD_BF16_vi     : DS_Real_vi<0x18, DS_PK_ADD_BF16>;
+def DS_PK_ADD_RTN_BF16_vi : DS_Real_vi<0xb8, DS_PK_ADD_RTN_BF16>;

``````````

</details>


https://github.com/llvm/llvm-project/pull/85001