Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/CodeGen/X86/conditional-tailcall-samedest.mir

@@ -1,139 +0,0 @@
-# RUN: llc -run-pass=branch-folder %s -o - | FileCheck %s
-
-# PR33980
-
-# Don't form conditional tail calls when the original conditional branch has
-# the same true and false destination. Otherwise, when we remove the tail call
-# successor we will also remove the fallthrough successor from the CFG.
-
-# CHECK: body:             |
-# CHECK:   bb.0.entry:
-# CHECK:     successors: %bb.1(0x40000000)
-# CHECK:     liveins: %edi
-# CHECK:     CMP32ri8 killed %edi, 2, implicit-def %eflags
-# CHECK:     TCRETURNdi64cc @mergeable_conditional_tailcall
-
-# This was the unconditional branch to a dead MBB that we left behind before
-# this bug was fixed.
-# CHECK-NOT: JMP_1 %bb.-1
-
---- |
-  ; ModuleID = 't.ll'
-  source_filename = "t.ll"
-  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
-  target triple = "x86_64--linux"
-  
-  @static_local_guard = external global i64, align 8
-  
-  ; Function Attrs: optsize
-  define void @f(i32 %arg) #0 {
-  entry:
-    switch i32 %arg, label %sw.epilog [
-      i32 0, label %sw.bb
-      i32 1, label %sw.bb
-      i32 2, label %sw.bb2
-    ]
-  
-  sw.bb:                                            ; preds = %entry, %entry
-    %tmp = load atomic i8, i8* bitcast (i64* @static_local_guard to i8*) acquire, align 8
-    %guard.uninitialized.i = icmp eq i8 %tmp, 0
-    br i1 %guard.uninitialized.i, label %init.check.i, label %return, !prof !0
-  
-  init.check.i:                                     ; preds = %sw.bb
-    tail call void @initialize_static_local(i64* nonnull @static_local_guard)
-    ret void
-  
-  sw.bb2:                                           ; preds = %entry
-    tail call void @mergeable_conditional_tailcall()
-    ret void
-  
-  sw.epilog:                                        ; preds = %entry
-    tail call void @mergeable_conditional_tailcall()
-    ret void
-  
-  return:                                           ; preds = %sw.bb
-    ret void
-  }
-  
-  declare void @mergeable_conditional_tailcall()
-  
-  declare void @initialize_static_local(i64*)
-  
-  ; Function Attrs: nounwind
-  declare void @llvm.stackprotector(i8*, i8**) #1
-  
-  attributes #0 = { optsize }
-  attributes #1 = { nounwind }
-  
-  !0 = !{!"branch_weights", i32 1, i32 1048575}
-
-...
----
-name:            f
-alignment:       0
-exposesReturnsTwice: false
-legalized:       false
-regBankSelected: false
-selected:        false
-tracksRegLiveness: true
-registers:       
-liveins:         
-  - { reg: '%edi', virtual-reg: '' }
-frameInfo:       
-  isFrameAddressTaken: false
-  isReturnAddressTaken: false
-  hasStackMap:     false
-  hasPatchPoint:   false
-  stackSize:       0
-  offsetAdjustment: 0
-  maxAlignment:    0
-  adjustsStack:    false
-  hasCalls:        false
-  stackProtector:  ''
-  maxCallFrameSize: 0
-  hasOpaqueSPAdjustment: false
-  hasVAStart:      false
-  hasMustTailInVarArgFunc: false
-  savePoint:       ''
-  restorePoint:    ''
-fixedStack:      
-stack:           
-constants:       
-body:             |
-  bb.0.entry:
-    successors: %bb.2(0x40000000), %bb.1(0x40000000)
-    liveins: %edi
-  
-    CMP32ri8 killed %edi, 2, implicit-def %eflags
-    JB_1 %bb.2, implicit %eflags
-    JMP_1 %bb.1
-  
-  bb.1.entry:
-    successors: %bb.4(0x40000000), %bb.5(0x40000000)
-    liveins: %eflags
-  
-    JE_1 %bb.4, implicit killed %eflags
-    JMP_1 %bb.5
-  
-  bb.2.sw.bb:
-    successors: %bb.3(0x00000800), %bb.6(0x7ffff800)
-  
-    %al = ACQUIRE_MOV8rm %rip, 1, %noreg, @static_local_guard, %noreg :: (volatile load acquire 1 from `i8* bitcast (i64* @static_local_guard to i8*)`, align 8)
-    TEST8rr killed %al, %al, implicit-def %eflags
-    JNE_1 %bb.6, implicit killed %eflags
-    JMP_1 %bb.3
-  
-  bb.3.init.check.i:
-    dead %edi = MOV32ri64 @static_local_guard, implicit-def %rdi
-    TCRETURNdi64 @initialize_static_local, 0, csr_64, implicit %rsp, implicit %rdi
-  
-  bb.4.sw.bb2:
-    TCRETURNdi64 @mergeable_conditional_tailcall, 0, csr_64, implicit %rsp
-  
-  bb.5.sw.epilog:
-    TCRETURNdi64 @mergeable_conditional_tailcall, 0, csr_64, implicit %rsp
-  
-  bb.6.return:
-    RET 0
-
-...