[AMDGPU] Fix GFX12 encoding of s_wait_event export_ready (#89622)

As well as flipping the sense of the bit, GFX12 moved it from bit 0 to
bit 1 in the encoded simm16 operand.

(cherry picked from commit e0a763c490d8ef58dca867e0ef834978ccf8e17d)

diff --git a/llvm/lib/Target/AMDGPU/SOPInstructions.td b/llvm/lib/Target/AMDGPU/SOPInstructions.td
index ae5ef0541929b7c6fe8faa605ba54a0253cef5e5..5762efde73f02ad3f1604b2bc0033dfa34a33636 100644 (file)
--- a/llvm/lib/Target/AMDGPU/SOPInstructions.td
+++ b/llvm/lib/Target/AMDGPU/SOPInstructions.td
@@ -1786,7 +1786,7 @@ def : GCNPat<
 let SubtargetPredicate = isNotGFX12Plus in
   def : GCNPat <(int_amdgcn_s_wait_event_export_ready), (S_WAIT_EVENT (i16 0))>;
 let SubtargetPredicate = isGFX12Plus in
-  def : GCNPat <(int_amdgcn_s_wait_event_export_ready), (S_WAIT_EVENT (i16 1))>;
+  def : GCNPat <(int_amdgcn_s_wait_event_export_ready), (S_WAIT_EVENT (i16 2))>;
 
 // The first 10 bits of the mode register are the core FP mode on all
 // subtargets.

diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.wait.event.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.wait.event.ll
index 08c77148f6ae13b9440dbe9da6dc481e6f250594..433fefa4349889c207d16d886ce803034f45faee 100644 (file)
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.wait.event.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.wait.event.ll
@@ -5,14 +5,10 @@
 
 ; GCN-LABEL: {{^}}test_wait_event:
 ; GFX11: s_wait_event 0x0
-; GFX12: s_wait_event 0x1
+; GFX12: s_wait_event 0x2
 
-define amdgpu_ps void @test_wait_event() #0 {
+define amdgpu_ps void @test_wait_event() {
 entry:
-  call void @llvm.amdgcn.s.wait.event.export.ready() #0
+  call void @llvm.amdgcn.s.wait.event.export.ready()
   ret void
 }
-
-declare void @llvm.amdgcn.s.wait.event.export.ready() #0
-
-attributes #0 = { nounwind }