[Assignment Tracking] getIntrinsicInstrCost: set dbg.assign cost to zero

[Orlando]

Summary

Does anyone have any good ideas on what a test for this looks like?

[Orlando]

Note that dbg_addr is also missing from this list. dbg_addr is in the process of being removed (cc @jryans) but maybe it's worth fixing in the mean time, since it's such a tiny fix? YMMV.

The result of having dbg_addr and dbg_assign missing from the list is that they're considered to cost 1 rather than 0, which changes optimisation decisions (unrolling, peeling, inlining, etc).

[jryans]

In D144652#4147834, @Orlando wrote:

Note that dbg_addr is also missing from this list. dbg_addr is in the process of being removed (cc @jryans) but maybe it's worth fixing in the mean time, since it's such a tiny fix? YMMV.

The result of having dbg_addr and dbg_assign missing from the list is that they're considered to cost 1 rather than 0, which changes optimisation decisions (unrolling, peeling, inlining, etc).

I'm hoping to finish up dbg_addr removal this weekend (though my time estimates are nearly always too optimistic).

I guess I'd say it's not worth adding dbg_addr here since (a) it's almost gone and (b) it's rarely seen in wild. I am fine with either approach though, it's of course easy to remove it from here as part of my patch stack if it does get added. 🙂

[Orlando]

I guess I'd say it's not worth adding dbg_addr here since

SGTM - it has already gone this long without anyone caring about the bug, it can wait a little longer till dbg_addr ceases to exist.

[StephenTozer]

Does anyone have any good ideas on what a test for this looks like?

I can see a test that I think is meant to test this function, in llvm/test/Analysis/CostModel there are 3 tests which test the cost of intrinsics (free-intrinsics-datalayout.ll, free-intrinsics-no_info.ll, and X86/free-intrinsics.ll). Those tests are using the auto-generated check scripts though, and it looks like the debug intrinsics in those scripts are being dropped (warning: ignoring debug info with an invalid version (0)), so the update script doesn't produce a check-line for them. Given that this is effectively a trivial extension to untested code I don't think the lack of test should block this script; but it'd be a welcome if you fixed the debug info version issue in those tests, added a debug assign instance, and reran the update scripts to produce an actual test output (as long as it is trivial to do so).

[Orlando]

Nice spot @StephenTozer - I've fixed those tests in D145573 and updated them in this patch to add dbg.assign checks.

[jmorse]

This looks good, but in the test outputs shouldn't the cost be zero? Auto-regenerated without rebuilding opt perhaps? (See inline comment)

llvm/test/Analysis/CostModel/X86/free-intrinsics.ll

11

Example of the cost being 1 for a dbg.assign, which would be wrong?

[Orlando]

llvm/test/Analysis/CostModel/X86/free-intrinsics.ll

11

Aha yes, must have introduced this mistake while fiddling with D145573. Are you happy for me to just fix this before landing?

[jmorse]

LGTM with inline rider

llvm/test/Analysis/CostModel/X86/free-intrinsics.ll

11

Sure, that sounds alright.

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

InstructionCost getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
     switch (ICA.getID()) {
     default:
       break;
     case Intrinsic::annotation:
     case Intrinsic::assume:
     case Intrinsic::sideeffect:
     case Intrinsic::pseudoprobe:
     case Intrinsic::arithmetic_fence:
+    case Intrinsic::dbg_assign:
     case Intrinsic::dbg_declare:
     case Intrinsic::dbg_value:
     case Intrinsic::dbg_label:
     case Intrinsic::invariant_start:
     case Intrinsic::invariant_end:
     case Intrinsic::launder_invariant_group:
     case Intrinsic::strip_invariant_group:
     case Intrinsic::is_constant:

llvm/test/Analysis/CostModel/X86/free-intrinsics.ll

 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
 ; RUN: opt -mtriple=x86_64-- -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=code-size %s -S -o - | FileCheck %s --check-prefix=CHECK-SIZE
 ; RUN: opt -mtriple=x86_64-- -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=throughput %s -S -o - | FileCheck %s --check-prefix=CHECK-THROUGHPUT
 
 define i32 @trivially_free() {
 ; CHECK-SIZE-LABEL: 'trivially_free'
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret i32 undef
 ;
 ; CHECK-THROUGHPUT-LABEL: 'trivially_free'
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret i32 undef
 ;
   %a0 = call i32 @llvm.annotation.i32(i32 undef, ptr undef, ptr undef, i32 undef)
   call void @llvm.assume(i1 undef)
   call void @llvm.experimental.noalias.scope.decl(metadata !4)
   call void @llvm.sideeffect()
+  call void @llvm.dbg.assign(metadata ptr undef, metadata !0, metadata !DIExpression(), metadata !10, metadata ptr undef, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.declare(metadata ptr undef, metadata !0, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.value(metadata i64 undef, i64 undef, metadata !DIExpression(), metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.label(metadata !2), !dbg !8
   %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
   call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
   %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
   %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
   %a4 = call i1 @llvm.is.constant.i32(i32 undef)
   call void @llvm.lifetime.start.p0(i64 1, ptr undef)
   call void @llvm.lifetime.end.p0(i64 1, ptr undef)
   %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 1, i1 1, i1 1)
   %a6 = call ptr @llvm.ptr.annotation.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   call void @llvm.var.annotation(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   ret i32 undef
 }
 
 declare i32 @llvm.annotation.i32(i32, ptr, ptr, i32)
 declare void @llvm.assume(i1)
 declare void @llvm.experimental.noalias.scope.decl(metadata)
 declare void @llvm.sideeffect()
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
 declare void @llvm.dbg.declare(metadata, metadata, metadata)
 declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
 declare void @llvm.dbg.label(metadata)
 declare ptr @llvm.invariant.start.p0(i64, ptr)
 declare void @llvm.invariant.end.p0(ptr, i64, ptr)
 declare ptr @llvm.launder.invariant.group.p0(ptr)
 declare ptr @llvm.strip.invariant.group.p0(ptr)
 declare i1 @llvm.is.constant.i32(i32)

 !2 = !DILabel(scope: !1, name: "label", file: !3, line: 7)
 !3 = !DIFile(filename: "debug-label.c", directory: "./")
 !4 = !{ !5 }
 !5 = distinct !{ !5, !6, !"foo: var" }
 !6 = distinct !{ !6, !"foo" }
 !7 = !{i32 2, !"Debug Info Version", i32 3}
 !8 = !DILocation(line: 0, scope: !1)
 !9 = distinct !DICompileUnit(language: DW_LANG_C11, file: !3, producer: "clang")
+!10 = distinct !DIAssignID()

llvm/test/Analysis/CostModel/free-intrinsics-datalayout.ll

 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
 ; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=code-size %s -S -o - | FileCheck %s --check-prefix=CHECK-SIZE
 ; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=throughput %s -S -o - | FileCheck %s --check-prefix=CHECK-THROUGHPUT
 
 target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
 
 define i32 @trivially_free() {
 ; CHECK-SIZE-LABEL: 'trivially_free'
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret i32 undef
 ;
 ; CHECK-THROUGHPUT-LABEL: 'trivially_free'
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret i32 undef
 ;
   %a0 = call i32 @llvm.annotation.i32(i32 undef, ptr undef, ptr undef, i32 undef)
   call void @llvm.assume(i1 undef)
   call void @llvm.experimental.noalias.scope.decl(metadata !4)
   call void @llvm.sideeffect()
+  call void @llvm.dbg.assign(metadata ptr undef, metadata !0, metadata !DIExpression(), metadata !10, metadata ptr undef, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.declare(metadata ptr undef, metadata !0, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.value(metadata i64 undef, i64 undef, metadata !DIExpression(), metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.label(metadata !2), !dbg !8
   %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
   call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
   %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
   %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
   %a4 = call i1 @llvm.is.constant.i32(i32 undef)
   call void @llvm.lifetime.start.p0(i64 1, ptr undef)
   call void @llvm.lifetime.end.p0(i64 1, ptr undef)
   %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 1, i1 1, i1 1)
   %a6 = call ptr @llvm.ptr.annotation.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   call void @llvm.var.annotation(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   ret i32 undef
 }
 
 declare i32 @llvm.annotation.i32(i32, ptr, ptr, i32)
 declare void @llvm.assume(i1)
 declare void @llvm.experimental.noalias.scope.decl(metadata)
 declare void @llvm.sideeffect()
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
 declare void @llvm.dbg.declare(metadata, metadata, metadata)
 declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
 declare void @llvm.dbg.label(metadata)
 declare ptr @llvm.invariant.start.p0(i64, ptr)
 declare void @llvm.invariant.end.p0(ptr, i64, ptr)
 declare ptr @llvm.launder.invariant.group.p0(ptr)
 declare ptr @llvm.strip.invariant.group.p0(ptr)
 declare i1 @llvm.is.constant.i32(i32)

 !2 = !DILabel(scope: !1, name: "label", file: !3, line: 7)
 !3 = !DIFile(filename: "debug-label.c", directory: "./")
 !4 = !{ !5 }
 !5 = distinct !{ !5, !6, !"foo: var" }
 !6 = distinct !{ !6, !"foo" }
 !7 = !{i32 2, !"Debug Info Version", i32 3}
 !8 = !DILocation(line: 0, scope: !1)
 !9 = distinct !DICompileUnit(language: DW_LANG_C11, file: !3, producer: "clang")
+!10 = distinct !DIAssignID()

llvm/test/Analysis/CostModel/free-intrinsics-no_info.ll

 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
 ; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=code-size %s -S -o - | FileCheck %s --check-prefix=CHECK-SIZE
 ; RUN: opt -passes="print<cost-model>" 2>&1 -disable-output -cost-kind=throughput %s -S -o - | FileCheck %s --check-prefix=CHECK-THROUGHPUT
 
 define i32 @trivially_free() {
 ; CHECK-SIZE-LABEL: 'trivially_free'
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret i32 undef
 ;
 ; CHECK-THROUGHPUT-LABEL: 'trivially_free'
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a0 = call i32 @llvm.annotation.i32.p0(i32 undef, ptr undef, ptr undef, i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.assume(i1 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.experimental.noalias.scope.decl(metadata !3)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.sideeffect()
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !8
-; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !9), !dbg !8
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: call void @llvm.dbg.assign(metadata ptr undef, metadata !6, metadata !DIExpression(), metadata !8, metadata ptr undef, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.declare(metadata ptr undef, metadata !6, metadata !DIExpression()), !dbg !9
+; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.dbg.label(metadata !10), !dbg !9
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a4 = call i1 @llvm.is.constant.i32(i32 undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.start.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.lifetime.end.p0(i64 1, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 true, i1 true, i1 true)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %a6 = call ptr @llvm.ptr.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: call void @llvm.var.annotation.p0.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
 ; CHECK-THROUGHPUT-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret i32 undef
 ;
   %a0 = call i32 @llvm.annotation.i32(i32 undef, ptr undef, ptr undef, i32 undef)
   call void @llvm.assume(i1 undef)
   call void @llvm.experimental.noalias.scope.decl(metadata !4)
   call void @llvm.sideeffect()
+  call void @llvm.dbg.assign(metadata ptr undef, metadata !0, metadata !DIExpression(), metadata !10, metadata ptr undef, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.declare(metadata ptr undef, metadata !0, metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.value(metadata i64 undef, i64 undef, metadata !DIExpression(), metadata !DIExpression()), !dbg !8
   call void @llvm.dbg.label(metadata !2), !dbg !8
   %a1 = call ptr @llvm.invariant.start.p0(i64 1, ptr undef)
   call void @llvm.invariant.end.p0(ptr undef, i64 1, ptr undef)
   %a2 = call ptr @llvm.launder.invariant.group.p0(ptr undef)
   %a3 = call ptr @llvm.strip.invariant.group.p0(ptr undef)
   %a4 = call i1 @llvm.is.constant.i32(i32 undef)
   call void @llvm.lifetime.start.p0(i64 1, ptr undef)
   call void @llvm.lifetime.end.p0(i64 1, ptr undef)
   %a5 = call i64 @llvm.objectsize.i64.p0(ptr undef, i1 1, i1 1, i1 1)
   %a6 = call ptr @llvm.ptr.annotation.p0(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   call void @llvm.var.annotation(ptr undef, ptr undef, ptr undef, i32 undef, ptr undef)
   ret i32 undef
 }
 
 declare i32 @llvm.annotation.i32(i32, ptr, ptr, i32)
 declare void @llvm.assume(i1)
 declare void @llvm.experimental.noalias.scope.decl(metadata)
 declare void @llvm.sideeffect()
+declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
 declare void @llvm.dbg.declare(metadata, metadata, metadata)
 declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
 declare void @llvm.dbg.label(metadata)
 declare ptr @llvm.invariant.start.p0(i64, ptr)
 declare void @llvm.invariant.end.p0(ptr, i64, ptr)
 declare ptr @llvm.launder.invariant.group.p0(ptr)
 declare ptr @llvm.strip.invariant.group.p0(ptr)
 declare i1 @llvm.is.constant.i32(i32)

 !2 = !DILabel(scope: !1, name: "label", file: !3, line: 7)
 !3 = !DIFile(filename: "debug-label.c", directory: "./")
 !4 = !{ !5 }
 !5 = distinct !{ !5, !6, !"foo: var" }
 !6 = distinct !{ !6, !"foo" }
 !7 = !{i32 2, !"Debug Info Version", i32 3}
 !8 = !DILocation(line: 0, scope: !1)
 !9 = distinct !DICompileUnit(language: DW_LANG_C11, file: !3, producer: "clang")
+!10 = distinct !DIAssignID()