diff --git a/llvm/test/CodeGen/AArch64/branch-relax-b.ll b/llvm/test/CodeGen/AArch64/branch-relax-b.ll
--- a/llvm/test/CodeGen/AArch64/branch-relax-b.ll
+++ b/llvm/test/CodeGen/AArch64/branch-relax-b.ll
@@ -44,16 +44,16 @@
 ; CHECK-NEXT:     // %bb.4:                               // %entry
 ; CHECK-NEXT:             str     [[SPILL_REGISTER:x[0-9]+]], [sp,
 ; CHECK-SAME:                                                       -16]!
-; CHECK-NEXT:             adrp    [[SPILL_REGISTER:x[0-9]+]], .LBB1_5
-; CHECK-NEXT:             add     [[SPILL_REGISTER:x[0-9]+]], [[SPILL_REGISTER:x[0-9]+]], :lo12:.LBB1_5
-; CHECK-NEXT:             br      [[SPILL_REGISTER:x[0-9]+]]
+; CHECK-NEXT:             adrp    [[SPILL_REGISTER]], .LBB1_5
+; CHECK-NEXT:             add     [[SPILL_REGISTER]], [[SPILL_REGISTER]], :lo12:.LBB1_5
+; CHECK-NEXT:             br      [[SPILL_REGISTER]]
 ; CHECK-NEXT:     .LBB1_1:                                // %iftrue
 ; CHECK-NEXT:             //APP
 ; CHECK-NEXT:             .zero   2048
 ; CHECK-NEXT:             //NO_APP
 ; CHECK-NEXT:             b       .LBB1_3
 ; CHECK-NEXT:     .LBB1_5:                                // %iffalse
-; CHECK-NEXT:             ldr     [[SPILL_REGISTER:x[0-9]+]], [sp], 
+; CHECK-NEXT:             ldr     [[SPILL_REGISTER]], [sp], 
 ; CHECK-SAME:                                                        16
 ; CHECK-NEXT:     // %bb.2:                               // %iffalse
 ; CHECK-NEXT:             //APP
@@ -135,5 +135,43 @@
   ret void
 }
 
+define void @relax_b_x16_taken() {
+; CHECK-LABEL:    relax_b_x16_taken:                      // @relax_b_x16_taken
+; COM: Pre-commit to record the behavior of relaxing an unconditional
+; COM: branch across which x16 is taken.
+; CHECK:          // %bb.0:                               // %entry
+; CHECK-NEXT:             //APP
+; CHECK-NEXT:             mov     x16, #1
+; CHECK-NEXT:             //NO_APP
+; CHECK-NEXT:             cbnz    x16, .LBB2_1
+; CHECK-NEXT:     // %bb.3:                               // %entry
+; CHECK-NEXT:             adrp    [[SCAVENGED_REGISTER2:x[0-9]+]], .LBB2_2
+; CHECK-NEXT:             add     [[SCAVENGED_REGISTER2]], [[SCAVENGED_REGISTER2]], :lo12:.LBB2_2
+; CHECK-NEXT:             br      [[SCAVENGED_REGISTER2]]
+; CHECK-NEXT:     .LBB2_1:                                // %iftrue
+; CHECK-NEXT:             //APP
+; CHECK-NEXT:             .zero   2048
+; CHECK-NEXT:             //NO_APP
+; CHECK-NEXT:             ret
+; CHECK-NEXT:     .LBB2_2:                                // %iffalse
+; CHECK-NEXT:             //APP
+; CHECK-NEXT:             // reg use x16
+; CHECK-NEXT:             //NO_APP
+; CHECK-NEXT:             ret
+entry:
+  %x16 = call i64 asm sideeffect "mov x16, 1", "={x16}"()
+
+  %cmp = icmp eq i64 %x16, 0
+  br i1 %cmp, label %iffalse, label %iftrue
+
+iftrue:
+  call void asm sideeffect ".space 2048", ""()
+  ret void
+
+iffalse:
+  call void asm sideeffect "# reg use $0", "{x16}"(i64 %x16)
+  ret void
+}
+
 declare i32 @bar()
 declare i32 @baz()
\ No newline at end of file
diff --git a/llvm/test/CodeGen/AArch64/branch-relax-cross-section.mir b/llvm/test/CodeGen/AArch64/branch-relax-cross-section.mir
--- a/llvm/test/CodeGen/AArch64/branch-relax-cross-section.mir
+++ b/llvm/test/CodeGen/AArch64/branch-relax-cross-section.mir
@@ -55,7 +55,7 @@
     br label %end
   }
 
-  define void @tbz_cold_to_hot(i1 zeroext %0) #0 {
+  define void @tbz_cold_to_hot(i1 zeroext %0) {
     br i1 %0, label %cold_block, label %hot_block
   
   cold_block:                                       ; preds = %1
@@ -89,6 +89,91 @@
     ret void
   }
 
+
+  define void @x16_used_cold_to_hot() {
+  entry:
+    %x16 = call i64 asm sideeffect "mov x16, 1", "={x16}"()
+    %cmp = icmp eq i64 %x16, 0
+    br i1 %cmp, label %hot, label %cold
+
+  hot:                                            ; preds = %cold, %entry
+    call void asm sideeffect "# reg use $0", "{x16}"(i64 %x16)
+    ret void
+
+  cold:                                           ; preds = %entry
+    call void asm sideeffect ".space 4", ""()
+    br label %hot
+  }
+
+  define void @all_used_cold_to_hot() {
+  entry:
+    %x0 = call i64 asm sideeffect "mov x0, 1", "={x0}"()
+    %x1 = call i64 asm sideeffect "mov x1, 1", "={x1}"()
+    %x2 = call i64 asm sideeffect "mov x2, 1", "={x2}"()
+    %x3 = call i64 asm sideeffect "mov x3, 1", "={x3}"()
+    %x4 = call i64 asm sideeffect "mov x4, 1", "={x4}"()
+    %x5 = call i64 asm sideeffect "mov x5, 1", "={x5}"()
+    %x6 = call i64 asm sideeffect "mov x6, 1", "={x6}"()
+    %x7 = call i64 asm sideeffect "mov x7, 1", "={x7}"()
+    %x8 = call i64 asm sideeffect "mov x8, 1", "={x8}"()
+    %x9 = call i64 asm sideeffect "mov x9, 1", "={x9}"()
+    %x10 = call i64 asm sideeffect "mov x10, 1", "={x10}"()
+    %x11 = call i64 asm sideeffect "mov x11, 1", "={x11}"()
+    %x12 = call i64 asm sideeffect "mov x12, 1", "={x12}"()
+    %x13 = call i64 asm sideeffect "mov x13, 1", "={x13}"()
+    %x14 = call i64 asm sideeffect "mov x14, 1", "={x14}"()
+    %x15 = call i64 asm sideeffect "mov x15, 1", "={x15}"()
+    %x17 = call i64 asm sideeffect "mov x17, 1", "={x17}"()
+    %x18 = call i64 asm sideeffect "mov x18, 1", "={x18}"()
+    %x19 = call i64 asm sideeffect "mov x19, 1", "={x19}"()
+    %x20 = call i64 asm sideeffect "mov x20, 1", "={x20}"()
+    %x21 = call i64 asm sideeffect "mov x21, 1", "={x21}"()
+    %x22 = call i64 asm sideeffect "mov x22, 1", "={x22}"()
+    %x23 = call i64 asm sideeffect "mov x23, 1", "={x23}"()
+    %x24 = call i64 asm sideeffect "mov x24, 1", "={x24}"()
+    %x25 = call i64 asm sideeffect "mov x25, 1", "={x25}"()
+    %x26 = call i64 asm sideeffect "mov x26, 1", "={x26}"()
+    %x27 = call i64 asm sideeffect "mov x27, 1", "={x27}"()
+    %x28 = call i64 asm sideeffect "mov x28, 1", "={x28}"()
+    br label %cold
+
+  exit:                                             ; preds = %cold
+    call void asm sideeffect "# reg use $0", "{x0}"(i64 %x0)
+    call void asm sideeffect "# reg use $0", "{x1}"(i64 %x1)
+    call void asm sideeffect "# reg use $0", "{x2}"(i64 %x2)
+    call void asm sideeffect "# reg use $0", "{x3}"(i64 %x3)
+    call void asm sideeffect "# reg use $0", "{x4}"(i64 %x4)
+    call void asm sideeffect "# reg use $0", "{x5}"(i64 %x5)
+    call void asm sideeffect "# reg use $0", "{x6}"(i64 %x6)
+    call void asm sideeffect "# reg use $0", "{x7}"(i64 %x7)
+    call void asm sideeffect "# reg use $0", "{x8}"(i64 %x8)
+    call void asm sideeffect "# reg use $0", "{x9}"(i64 %x9)
+    call void asm sideeffect "# reg use $0", "{x10}"(i64 %x10)
+    call void asm sideeffect "# reg use $0", "{x11}"(i64 %x11)
+    call void asm sideeffect "# reg use $0", "{x12}"(i64 %x12)
+    call void asm sideeffect "# reg use $0", "{x13}"(i64 %x13)
+    call void asm sideeffect "# reg use $0", "{x14}"(i64 %x14)
+    call void asm sideeffect "# reg use $0", "{x15}"(i64 %x15)
+    call void asm sideeffect "# reg use $0", "{x16}"(i64 %x16)
+    call void asm sideeffect "# reg use $0", "{x17}"(i64 %x17)
+    call void asm sideeffect "# reg use $0", "{x18}"(i64 %x18)
+    call void asm sideeffect "# reg use $0", "{x19}"(i64 %x19)
+    call void asm sideeffect "# reg use $0", "{x20}"(i64 %x20)
+    call void asm sideeffect "# reg use $0", "{x21}"(i64 %x21)
+    call void asm sideeffect "# reg use $0", "{x22}"(i64 %x22)
+    call void asm sideeffect "# reg use $0", "{x23}"(i64 %x23)
+    call void asm sideeffect "# reg use $0", "{x24}"(i64 %x24)
+    call void asm sideeffect "# reg use $0", "{x25}"(i64 %x25)
+    call void asm sideeffect "# reg use $0", "{x26}"(i64 %x26)
+    call void asm sideeffect "# reg use $0", "{x27}"(i64 %x27)
+    call void asm sideeffect "# reg use $0", "{x28}"(i64 %x28)
+    ret void
+
+  cold:                                             ; preds = %entry
+    %x16 = call i64 asm sideeffect "mov x16, 1", "={x16}"()
+    br label %exit
+  }
+
 ...
 ---
 name:            relax_tbz
@@ -104,13 +189,13 @@
   ; COM: Check that cross-section conditional branches are
   ; COM:   relaxed.
   ; CHECK: bb.0 (%ir-block.1, bbsections 1):
-  ; CHECK-NEXT: successors: %bb.3(0x40000000)
+  ; CHECK-NEXT: successors: %bb.3
   ; CHECK:  TBNZW
   ; CHECK-SAME:   %bb.3
   ; CHECK:      B %bb.2
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT: bb.3 (%ir-block.1, bbsections 1):
-  ; CHECK-NEXT: successors: %bb.1(0x80000000)
+  ; CHECK-NEXT: successors: %bb.1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:    B %bb.1
   ; CHECK-NEXT: {{  $}}
@@ -120,7 +205,7 @@
   ; CHECK-NEXT:  bb.2.true_block (bbsections 3):
   ; CHECK:    TCRETURNdi @qux, 0, csr_aarch64_aapcs, implicit $sp
   bb.0 (%ir-block.1, bbsections 1):
-    successors: %bb.1(0x40000000), %bb.2(0x40000000)
+    successors: %bb.1, %bb.2
     liveins: $w0, $lr
 
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store (s64) into %stack.0)
@@ -151,20 +236,21 @@
   ; COM: Check that branch relaxation relaxes cross-section conditional
   ; COM:   branches by creating trampolines after all other hot basic blocks.
   ; CHECK: bb.0 (%ir-block.1):
-  ; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.3(0x40000000)
+  ; CHECK-NEXT: successors: %bb.1
+  ; CHECK-SAME:                  , %bb.3
   ; CHECK:  TBZW
   ; CHECK-SAME: %bb.3
   ; CHECK:  bb.1.hot_block:
   ; CHECK:    TCRETURNdi @qux, 0, csr_aarch64_aapcs, implicit $sp
   ; CHECK:  bb.3 (%ir-block.1):
-  ; CHECK-NEXT:    successors: %bb.2(0x80000000)
+  ; CHECK-NEXT:    successors: %bb.2
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:    B %bb.2
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:  bb.2.cold_block (bbsections Cold):
   ; CHECK:    TCRETURNdi @qux, 0, csr_aarch64_aapcs, implicit $sp
   bb.0 (%ir-block.1):
-    successors: %bb.1(0x40000000), %bb.2(0x40000000)
+    successors: %bb.1, %bb.2
     liveins: $w0, $lr
 
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store (s64) into %stack.0)
@@ -197,7 +283,8 @@
   ; COM: Check that branch relaxation doesn't insert a trampoline if there is no
   ; COM:   viable insertion location.
   ; CHECK:    bb.0 (%ir-block.1):
-  ; CHECK-NEXT:    successors: %bb.1(0x40000000), %bb.3(0x40000000)
+  ; CHECK-NEXT:    successors: %bb.1
+  ; CHECK-SAME:                     , %bb.3
   ; CHECK:    CBNZW
   ; CHECK-SAME:    %bb.1
   ; CHECK-NEXT: B
@@ -207,7 +294,7 @@
   ; CHECK:  bb.2.cold (bbsections Cold):
   ; CHECK:    TCRETURNdi
   bb.0 (%ir-block.1):
-    successors: %bb.1(0x40000000), %bb.2(0x40000000)
+    successors: %bb.1, %bb.2
     liveins: $w0, $lr
   
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store (s64) into %stack.0)
@@ -241,7 +328,8 @@
   ; COM: Check that relaxation of conditional branches from the Cold section to
   ; COM:   the Hot section doesn't modify the Hot section.
   ; CHECK:  bb.0 (%ir-block.1, bbsections Cold):
-  ; CHECK-NEXT:    successors: %bb.1(0x40000000), %bb.2(0x40000000)
+  ; CHECK-NEXT:    successors: %bb.1
+  ; CHECK-SAME:                     , %bb.2
   ; CHECK:    CBNZW
   ; CHECK-SAME:     %bb.1
   ; CHECK-NEXT:    B %bb.2
@@ -250,7 +338,7 @@
   ; CHECK:  bb.2.hot_block:
   ; CHECK:    TCRETURNdi
   bb.0 (%ir-block.1, bbsections Cold):
-    successors: %bb.1(0x40000000), %bb.2(0x40000000)
+    successors: %bb.1, %bb.2
     liveins: $w0, $lr
   
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store (s64) into %stack.0)
@@ -284,27 +372,29 @@
   ; COM: Check that a conditional branch to a trampoline is properly relaxed
   ; COM:   if the trampoline is pushed out of range.
   ; INDIRECT:      bb.0.entry:
-  ; INDIRECT-NEXT:   successors: %bb.1(0x40000000), %[[TRAMP1:bb.[0-9]+]](0x40000000)
+  ; INDIRECT-NEXT:   successors: %bb.1
+  ; INDIRECT-SAME:                    , %[[TRAMP1:bb.[0-9]+]]
   ; INDIRECT:        TBNZW
   ; INDIRECT-SAME:         %bb.1
   ; INDIRECT-NEXT:    B{{ }}
   ; INDIRECT-SAME:           %[[TRAMP1]]
   ; INDIRECT:      bb.1.unrelaxable:
-  ; INDIRECT-NEXT:   successors: %bb.2(0x40000000), %[[TRAMP2:bb.[0-9]+]](0x40000000)
+  ; INDIRECT-NEXT:   successors: %bb.2
+  ; INDIRECT-SAME:                    , %[[TRAMP2:bb.[0-9]+]]
   ; INDIRECT:        TBNZW
   ; INDIRECT-SAME:         %bb.2
   ; INDIRECT:      [[TRAMP2]]
-  ; INDIRECT-NEXT:   successors: %bb.3(0x80000000)
+  ; INDIRECT-NEXT:   successors: %bb.3
   ; INDIRECT:      bb.2.end:
   ; INDIRECT:        TCRETURNdi
   ; INDIRECT:      [[TRAMP1]].entry:
-  ; INDIRECT:        successors: %bb.3(0x80000000)
+  ; INDIRECT:        successors: %bb.3
   ; INDIRECT-NOT:  bbsections Cold
   ; INDIRECT:      bb.3.cold (bbsections Cold):
   ; INDIRECT:        TCRETURNdi
 
   bb.0.entry (%ir-block.entry):
-    successors: %bb.1(0x40000000), %bb.3(0x40000000)
+    successors: %bb.1, %bb.3
     liveins: $w0, $w1, $lr
 
     early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 :: (store (s64) into %stack.0)
@@ -312,7 +402,7 @@
     TBZW killed renamable $w0, 0, %bb.3
 
   bb.1.unrelaxable:
-    successors: %bb.2(0x40000000), %bb.3(0x40000000)
+    successors: %bb.2, %bb.3
     liveins: $w1, $x16
 
     TBNZW killed renamable $w1, 0, %bb.2
@@ -335,3 +425,255 @@
     TCRETURNdi @qux, 0, csr_aarch64_aapcs, implicit $sp
 
 ...
+
+name:            x16_used_cold_to_hot
+tracksRegLiveness: true
+liveins:         []
+machineFunctionInfo:
+  hasRedZone:      false
+body:             |
+  ; INDIRECT-LABEL: name: x16_used_cold_to_hot
+  ; COM: Pre-commit to record the behavior of relaxing a "cold-to-hot"
+  ; COM: unconditional branch across which x16 is taken but there is
+  ; COM: still a free register.
+  ; INDIRECT:       bb.0.entry:
+  ; INDIRECT-NEXT:    successors: %bb.1
+  ; INDIRECT-SAME:                     , %bb.3
+  ; INDIRECT:         TBZW killed renamable $w8, 0, %bb.1
+  ; INDIRECT-NEXT:    {{ $}}
+  ; INDIRECT-NEXT:  bb.3.entry:
+  ; INDIRECT-NEXT:    successors: %bb.2
+  ; INDIRECT-NEXT:    liveins: $x16
+  ; INDIRECT-NEXT:    {{ $}}
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER3:x[0-9]+]] = ADRP target-flags(aarch64-page) <mcsymbol x16_used_cold_to_hot.cold>
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER3]] = ADDXri $[[SCAVENGED_REGISTER3]], target-flags(aarch64-pageoff, aarch64-nc) <mcsymbol x16_used_cold_to_hot.cold>, 0
+  ; INDIRECT-NEXT:    BR $[[SCAVENGED_REGISTER3]]
+  ; INDIRECT:       bb.1.hot:
+  ; INDIRECT-NEXT:    liveins: $x16
+  ; INDIRECT:           killed $x16
+  ; INDIRECT:         RET undef $lr
+  ; INDIRECT:       bb.2.cold (bbsections Cold):
+  ; INDIRECT-NEXT:    successors: %bb.5
+  ; INDIRECT-NEXT:    liveins: $x16
+  ; INDIRECT-NEXT:    {{ $}}
+  ; INDIRECT-NEXT:    INLINEASM &".space 4", 1 /* sideeffect attdialect */
+  ; INDIRECT-NEXT:    {{ $}}
+  ; INDIRECT-NEXT:  bb.5.cold (bbsections Cold):
+  ; INDIRECT-NEXT:    successors: %bb.1
+  ; INDIRECT-NEXT:    liveins: $x16
+  ; INDIRECT-NEXT:    {{ $}}
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER4:x[0-9]+]] = ADRP target-flags(aarch64-page) <mcsymbol .LBB5_1>
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER4]] = ADDXri $[[SCAVENGED_REGISTER4]], target-flags(aarch64-pageoff, aarch64-nc) <mcsymbol .LBB5_1>, 0
+  ; INDIRECT-NEXT:    BR $[[SCAVENGED_REGISTER4]]
+
+  bb.0.entry:
+    successors: %bb.1, %bb.2
+
+    $sp = frame-setup SUBXri $sp, 16, 0
+    INLINEASM &"mov x16, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x16
+    dead renamable $x8 = SUBSXri $x16, 0, 0, implicit-def $nzcv
+    renamable $w8 = CSINCWr $wzr, $wzr, 1, implicit killed $nzcv
+    TBZW killed renamable $w8, 0, %bb.1
+
+    B %bb.2
+
+  bb.1.hot:
+    liveins: $x16
+
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x16
+    $sp = frame-destroy ADDXri $sp, 16, 0
+    RET undef $lr
+
+  bb.2.cold (bbsections Cold):
+    successors: %bb.1
+    liveins: $x16
+
+    INLINEASM &".space 4", 1 /* sideeffect attdialect */
+    B %bb.1
+...
+---
+name:            all_used_cold_to_hot
+tracksRegLiveness: true
+stack:
+  - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x23', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x24', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 6, name: '', type: spill-slot, offset: -56, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x25', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 7, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x26', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 8, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x27', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 9, name: '', type: spill-slot, offset: -80, size: 8, alignment: 8, 
+      stack-id: default, callee-saved-register: '$x28', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 10, name: '', type: spill-slot, offset: -96, size: 8, alignment: 16, 
+      stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true, 
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+machineFunctionInfo:
+  hasRedZone:      false
+body:             |
+  ; INDIRECT-LABEL: name: all_used_cold_to_hot
+  ; COM: Pre-commit to record the behavior of relaxing a "cold-to-hot"
+  ; COM: unconditional branch across which there are no free registers.
+  ; INDIRECT:      bb.0.entry:
+  ; INDIRECT-NEXT:     successors: %bb.3
+  ; INDIRECT-NEXT:     liveins: $fp, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
+  ; INDIRECT-COUNT-29: INLINEASM &"mov
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT:      bb.3.entry:
+  ; INDIRECT-NEXT:     successors: %bb.2
+  ; INDIRECT-NEXT:     liveins: $fp,  $x0,  $x1,  $x2,  $x3,  $x4,  $x5,  $x6,  $x7,  $x8,
+  ; INDIRECT-SAME:              $x9,  $x10, $x11, $x12, $x13, $x14, $x15, $x17, $x18, $x19,
+  ; INDIRECT-SAME:              $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER5:x[0-9]+]] = ADRP target-flags(aarch64-page) <mcsymbol all_used_cold_to_hot.cold>
+  ; INDIRECT-NEXT:    $[[SCAVENGED_REGISTER5]] = ADDXri $[[SCAVENGED_REGISTER5]], target-flags(aarch64-pageoff, aarch64-nc) <mcsymbol all_used_cold_to_hot.cold>, 0
+  ; INDIRECT-NEXT:    BR $[[SCAVENGED_REGISTER5]]
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:    bb.6.exit:
+  ; INDIRECT-NEXT:    successors: %bb.1
+  ; INDIRECT-NEXT:    liveins: $x0,  $x1,  $x2,  $x3,  $x4,  $x5,  $x6,  $x7,  $x8,  $x9,
+  ; INDIRECT-SAME:             $x10, $x11, $x12, $x13, $x14, $x15, $x17, $x18, $x19, $x20,
+  ; INDIRECT-SAME:             $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:    early-clobber $sp, $[[SPILL_REGISTER:x[0-9]+]] = LDRXpost $sp, 16
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:   bb.1.exit:
+  ; INDIRECT-NEXT:     liveins: $x0,  $x1,  $x2,  $x3,  $x4,  $x5,  $x6,  $x7,  $x8,  $x9,
+  ; INDIRECT-SAME:              $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19,
+  ; INDIRECT-SAME:              $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-COUNT-30: INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed
+  ; INDIRECT:          RET undef $lr
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:   bb.2.cold (bbsections Cold):
+  ; INDIRECT-NEXT:     successors: %bb.5
+  ; INDIRECT-NEXT:     liveins: $x0,  $x1,  $x2,  $x3,  $x4,  $x5,  $x6,  $x7,  $x8,  $x9,
+  ; INDIRECT-SAME:              $x10, $x11, $x12, $x13, $x14, $x15, $x17, $x18, $x19, $x20,
+  ; INDIRECT-SAME:              $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:     INLINEASM &"mov x16, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x16
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:   bb.5.cold (bbsections Cold):
+  ; INDIRECT-NEXT:     successors: %bb.6
+  ; INDIRECT-NEXT:     liveins: $fp,  $x0,  $x1,  $x2,  $x3,  $x4,  $x5,  $x6,  $x7,  $x8,
+  ; INDIRECT-SAME:              $x9,  $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18,
+  ; INDIRECT-SAME:              $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
+  ; INDIRECT-NEXT:     {{ $}}
+  ; INDIRECT-NEXT:     early-clobber $sp = STRXpre $[[SPILL_REGISTER]], $sp, -16
+  ; INDIRECT-NEXT:     $[[SPILL_REGISTER]] = ADRP target-flags(aarch64-page) <mcsymbol .LBB6_6>
+  ; INDIRECT-NEXT:     $[[SPILL_REGISTER]] = ADDXri $[[SPILL_REGISTER]], target-flags(aarch64-pageoff, aarch64-nc) <mcsymbol .LBB6_6>, 0
+  ; INDIRECT-NEXT:     BR $[[SPILL_REGISTER]]
+
+  bb.0.entry:
+    successors: %bb.2
+    liveins: $fp, $x27, $x28, $x25, $x26, $x23, $x24, $x21, $x22, $x19, $x20
+
+    $sp = frame-setup SUBXri $sp, 112, 0
+    frame-setup STRXui killed $fp, $sp, 2 :: (store (s64) into %stack.10)
+    frame-setup STPXi killed $x28, killed $x27, $sp, 4 :: (store (s64) into %stack.9), (store (s64) into %stack.8)
+    frame-setup STPXi killed $x26, killed $x25, $sp, 6 :: (store (s64) into %stack.7), (store (s64) into %stack.6)
+    frame-setup STPXi killed $x24, killed $x23, $sp, 8 :: (store (s64) into %stack.5), (store (s64) into %stack.4)
+    frame-setup STPXi killed $x22, killed $x21, $sp, 10 :: (store (s64) into %stack.3), (store (s64) into %stack.2)
+    frame-setup STPXi killed $x20, killed $x19, $sp, 12 :: (store (s64) into %stack.1), (store (s64) into %stack.0)
+    INLINEASM &"mov x0, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x0
+    INLINEASM &"mov x1, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x1
+    INLINEASM &"mov x2, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x2
+    INLINEASM &"mov x3, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x3
+    INLINEASM &"mov x4, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x4
+    INLINEASM &"mov x5, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x5
+    INLINEASM &"mov x6, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x6
+    INLINEASM &"mov x7, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x7
+    INLINEASM &"mov x8, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x8
+    INLINEASM &"mov x9, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x9
+    INLINEASM &"mov x10, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x10
+    INLINEASM &"mov x11, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x11
+    INLINEASM &"mov x12, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x12
+    INLINEASM &"mov x13, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x13
+    INLINEASM &"mov x14, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x14
+    INLINEASM &"mov x15, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x15
+    INLINEASM &"mov x17, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x17
+    INLINEASM &"mov x18, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x18
+    INLINEASM &"mov x19, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x19
+    INLINEASM &"mov x20, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x20
+    INLINEASM &"mov x21, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x21
+    INLINEASM &"mov x22, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x22
+    INLINEASM &"mov x23, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x23
+    INLINEASM &"mov x24, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x24
+    INLINEASM &"mov x25, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x25
+    INLINEASM &"mov x26, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x26
+    INLINEASM &"mov x27, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x27
+    INLINEASM &"mov x28, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x28
+    INLINEASM &"mov fp, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $fp
+    B %bb.2
+
+
+  bb.1.exit:
+    liveins: $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
+
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x0
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x1
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x2
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x3
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x4
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x5
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x6
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x7
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x8
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x9
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x10
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x11
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x12
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x13
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x14
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x15
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x16
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x17
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x18
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x19
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x20
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x21
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x22
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x23
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x24
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x25
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x26
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x27
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $x28
+    INLINEASM &"# reg use $0", 1 /* sideeffect attdialect */, 9 /* reguse */, killed $fp
+    $x20, $x19 = frame-destroy LDPXi $sp, 12 :: (load (s64) from %stack.1), (load (s64) from %stack.0)
+    $x22, $x21 = frame-destroy LDPXi $sp, 10 :: (load (s64) from %stack.3), (load (s64) from %stack.2)
+    $x24, $x23 = frame-destroy LDPXi $sp, 8 :: (load (s64) from %stack.5), (load (s64) from %stack.4)
+    $x26, $x25 = frame-destroy LDPXi $sp, 6 :: (load (s64) from %stack.7), (load (s64) from %stack.6)
+    $x28, $x27 = frame-destroy LDPXi $sp, 4 :: (load (s64) from %stack.9), (load (s64) from %stack.8)
+    $fp = frame-destroy LDRXui $sp, 2 :: (load (s64) from %stack.10)
+    $sp = frame-destroy ADDXri $sp, 112, 0
+    RET undef $lr
+
+  bb.2.cold (bbsections Cold):
+    successors: %bb.1
+    liveins: $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x17, $x18, $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28, $fp
+
+    INLINEASM &"mov x16, 1", 1 /* sideeffect attdialect */, 10 /* regdef */, implicit-def $x16
+    B %bb.1
+
+...