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llvm-project/llvm/test/DebugInfo/MIR/InstrRef/phi-coalescing.mir
Stephen Tozer c383f4d655 [DebugInfo] Allow non-stack_value variadic expressions and use in DBG_INSTR_REF 
Prior to this patch, variadic DIExpressions (i.e. ones that contain
DW_OP_LLVM_arg) could only be created by salvaging debug values to create
stack value expressions, resulting in a DBG_VALUE_LIST being created. As of
the previous patch in this patch stack, DBG_INSTR_REF's syntax has been
changed to match DBG_VALUE_LIST in preparation for supporting variadic
expressions. This patch adds some minor changes needed to allow variadic
expressions that aren't stack values to exist, and allows variadic expressions
that are trivially reduceable to non-variadic expressions to be handled
similarly to non-variadic expressions.

Reviewed by: jmorse

Differential Revision: https://reviews.llvm.org/D133926
2023-01-06 19:31:10 +00:00

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# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations \
# RUN: -run-pass=phi-node-elimination,simple-register-coalescing \
# RUN: | FileCheck %s --check-prefix=DOESCOALESCE
# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations \
# RUN: -run-pass=phi-node-elimination,simple-register-coalescing,livedebugvars,greedy,virtregrewriter \
# RUN: | FileCheck %s --check-prefix=CHECK
#
# Test that a PHI with a debug instruction number attached survives register
# coalescing, when its vreg gets coalesced. This test comes in two parts, first
# that coalescing actually happens, second that a DBG_PHI is still produced
# afterwards.
#
# Original C code, the PHI is of the value of 'bar' after the control flow.
# Compiled at -O0, applied -mem2reg, llc -O0, then manually added the PHI
# instruction label. Additional variable locations removed.
#
# void ext(long);
# long getlong(void);
# int foo(long bar, long baz) {
# ext(bar);
# bar += 12;
# ext(bar);
#
# if (getlong())
# bar += 1;
#
# bar += baz;
# ext(bar);
# return bar;
# }
#
--- |
; ModuleID = 'promoted.ll'
source_filename = "test.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
entry:
call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
call void @ext(i64 %bar), !dbg !13
%add = add nsw i64 %bar, 12, !dbg !13
call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add), !dbg !13
%call = call i64 @getlong(), !dbg !13
%tobool = icmp ne i64 %call, 0, !dbg !13
br i1 %tobool, label %if.then, label %if.end, !dbg !13
if.then: ; preds = %entry
%add1 = add nsw i64 %add, 1, !dbg !13
call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13
br label %if.end, !dbg !13
if.end: ; preds = %if.then, %entry
%bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13
call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
%add2 = add nsw i64 %bar.addr.0, %baz, !dbg !13
call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
call void @ext(i64 %add2), !dbg !13
%conv = trunc i64 %add2 to i32, !dbg !13
ret i32 %conv, !dbg !13
}
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)
declare dso_local void @ext(i64)
declare dso_local i64 @getlong()
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!""}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
!13 = !DILocation(line: 0, scope: !7)
!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
liveins:
- { reg: '$rdi', virtual-reg: '%3' }
- { reg: '$rsi', virtual-reg: '%5' }
frameInfo:
maxAlignment: 1
hasCalls: true
machineFunctionInfo: {}
body: |
bb.0.entry:
liveins: $rdi, $rsi
%5:gr64 = COPY $rsi
%3:gr64 = COPY $rdi
%4:gr64 = COPY killed %3
%6:gr64 = COPY killed %5
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %4, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%9:gr64 = ADD64ri32 %4, 12, implicit-def $eflags, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %9, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%8:gr64 = COPY $rax, debug-location !13
CMP64ri8 %8, 0, implicit-def $eflags, debug-location !13
JCC_1 %bb.2, 4, implicit $eflags, debug-location !13
; DOESCOALESCE-LABEL: bb.1.if.then:
; CHECK-LABEL: bb.1.if.then:
bb.1.if.then:
%10:gr64 = ADD64ri32 %9, 1, implicit-def $eflags, debug-location !13
; Verify that the vreg is different immediately after register coalescing.
; DOESCOALESCE-NOT: %10:gr64 ADD64ri32
; DOESCOALESCE: %{{[0-9]+}}:gr64_with_sub_8bit = ADD64ri32
; Verify that all these registers land in r14.
; CHECK: renamable $r14 = ADD64ri32 killed renamable $r14
; DOESCOALESCE-LABEL: bb.2.if.end:
; CHECK-LABEL: bb.2.if.end:
bb.2.if.end:
%2:gr64 = PHI %9, %bb.0, %10, %bb.1, debug-instr-number 1, debug-location !13
; CHECK: DBG_PHI $r14, 1
DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
%2:gr64 = ADD64rr killed %2, %6, implicit-def $eflags, debug-location !13
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
$rdi = COPY %2, debug-location !13
CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13
ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
%13:gr32 = COPY %2.sub_32bit, debug-location !13
$eax = COPY %13, debug-location !13
RET64 implicit $eax, debug-location !13
...
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