| # 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 = ADD64ri32 |
| ; Verify that all these registers land in rbx. |
| ; CHECK: renamable $rbx = ADD64ri32 killed renamable $rbx |
| |
| ; 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 $rbx, 1 |
| DBG_INSTR_REF 1, 0, !12, !DIExpression(), debug-location !13 |
| %14: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 %14, 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 %14.sub_32bit, debug-location !13 |
| $eax = COPY %13, debug-location !13 |
| RET64 implicit $eax, debug-location !13 |
| |
| ... |