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[framelowering] Skip dbg values when getting next/previous instruction. Summary: In mergeSPUpdates, debug values need to be ignored when getting the previous element, otherwise debug data could have an impact on codegen. In eliminateCallFramePseudoInstr, debug values after the erased element could have an impact on codegen and should be skipped. Closes PR31319 (https://llvm.org/bugs/show_bug.cgi?id=31319) Reviewers: aprantl, MatzeB, mkuper Subscribers: gbedwell, llvm-commits Differential Revision: https://reviews.llvm.org/D27688 llvm-svn: 290955
2017-01-04 20:08:35 +08:00
; Test ensuring debug intrinsics do not affect generated function prologue.
;
; RUN: llc -O1 -mtriple=x86_64-unknown-unknown -o - %s | FileCheck %s
@a = local_unnamed_addr global i64 0, align 8
define void @noDebug() {
entry:
%0 = load i64, i64* @a, align 8
%1 = load i64, i64* @a, align 8
%2 = load i64, i64* @a, align 8
%3 = tail call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %0, i64 %1)
%4 = extractvalue { i64, i1 } %3, 0
%5 = tail call i64 @fn1(i64 %4, i64 %2)
tail call void (...) @printf()
tail call void (...) @printf(i64 1, i64 2, i64 3, i64 4, i32 0, i64 0, i64 %4, i64 %5)
ret void
}
; CHECK-LABEL: noDebug
Revert "Correct dwarf unwind information in function epilogue for X86" This reverts r317579, originally committed as r317100. There is a design issue with marking CFI instructions duplicatable. Not all targets support the CFIInstrInserter pass, and targets like Darwin can't cope with duplicated prologue setup CFI instructions. The compact unwind info emission fails. When the following code is compiled for arm64 on Mac at -O3, the CFI instructions end up getting tail duplicated, which causes compact unwind info emission to fail: int a, c, d, e, f, g, h, i, j, k, l, m; void n(int o, int *b) { if (g) f = 0; for (; f < o; f++) { m = a; if (l > j * k > i) j = i = k = d; h = b[c] - e; } } We get assembly that looks like this: ; BB#1: ; %if.then Lloh3: adrp x9, _f@GOTPAGE Lloh4: ldr x9, [x9, _f@GOTPAGEOFF] mov w8, wzr Lloh5: str wzr, [x9] stp x20, x19, [sp, #-16]! ; 8-byte Folded Spill .cfi_def_cfa_offset 16 .cfi_offset w19, -8 .cfi_offset w20, -16 cmp w8, w0 b.lt LBB0_3 b LBB0_7 LBB0_2: ; %entry.if.end_crit_edge Lloh6: adrp x8, _f@GOTPAGE Lloh7: ldr x8, [x8, _f@GOTPAGEOFF] Lloh8: ldr w8, [x8] stp x20, x19, [sp, #-16]! ; 8-byte Folded Spill .cfi_def_cfa_offset 16 .cfi_offset w19, -8 .cfi_offset w20, -16 cmp w8, w0 b.ge LBB0_7 LBB0_3: ; %for.body.lr.ph Note the multiple .cfi_def* directives. Compact unwind info emission can't handle that. llvm-svn: 317726
2017-11-09 05:31:14 +08:00
; CHECK: addq $24, %rsp
; CHECK: popq %rbx
; CHECK-NEXT: popq %r14
; CHECK-NEXT: retq
[framelowering] Skip dbg values when getting next/previous instruction. Summary: In mergeSPUpdates, debug values need to be ignored when getting the previous element, otherwise debug data could have an impact on codegen. In eliminateCallFramePseudoInstr, debug values after the erased element could have an impact on codegen and should be skipped. Closes PR31319 (https://llvm.org/bugs/show_bug.cgi?id=31319) Reviewers: aprantl, MatzeB, mkuper Subscribers: gbedwell, llvm-commits Differential Revision: https://reviews.llvm.org/D27688 llvm-svn: 290955
2017-01-04 20:08:35 +08:00
define void @withDebug() !dbg !18 {
entry:
%0 = load i64, i64* @a, align 8
%1 = load i64, i64* @a, align 8
%2 = load i64, i64* @a, align 8
%3 = tail call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %0, i64 %1)
%4 = extractvalue { i64, i1 } %3, 0
%5 = tail call i64 @fn1(i64 %4, i64 %2)
tail call void @llvm.dbg.value(metadata i64 %4, i64 0, metadata !23, metadata !33), !dbg !34
tail call void @llvm.dbg.value(metadata i64 %5, i64 0, metadata !22, metadata !33), !dbg !35
tail call void (...) @printf()
tail call void (...) @printf(i64 1, i64 2, i64 3, i64 4, i32 0, i64 0, i64 %4, i64 %5)
ret void
}
; CHECK-LABEL: withDebug
[DebugInfo] Sort the SDDbgValue list before assuming it is in IR order Summary: This code iterates the 'Orders' vector in parallel with the DbgValue list, emitting all DBG_VALUEs that occurred between the last IR order insertion point and the next insertion point. This assumes the SDDbgValue list is sorted in IR order, which it usually is. However, it is not sorted when a node with a debug value is replaced with another one. When this happens, TransferDbgValues is called, and the new value is added to the end of the list. The problem can be solved by stably sorting the list by IR order. Reviewers: aprantl, Ka-Ka Reviewed By: aprantl Subscribers: MatzeB, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D38197 llvm-svn: 314114
2017-09-26 00:14:53 +08:00
; CHECK: callq printf
; CHECK: callq printf
Revert "Correct dwarf unwind information in function epilogue for X86" This reverts r317579, originally committed as r317100. There is a design issue with marking CFI instructions duplicatable. Not all targets support the CFIInstrInserter pass, and targets like Darwin can't cope with duplicated prologue setup CFI instructions. The compact unwind info emission fails. When the following code is compiled for arm64 on Mac at -O3, the CFI instructions end up getting tail duplicated, which causes compact unwind info emission to fail: int a, c, d, e, f, g, h, i, j, k, l, m; void n(int o, int *b) { if (g) f = 0; for (; f < o; f++) { m = a; if (l > j * k > i) j = i = k = d; h = b[c] - e; } } We get assembly that looks like this: ; BB#1: ; %if.then Lloh3: adrp x9, _f@GOTPAGE Lloh4: ldr x9, [x9, _f@GOTPAGEOFF] mov w8, wzr Lloh5: str wzr, [x9] stp x20, x19, [sp, #-16]! ; 8-byte Folded Spill .cfi_def_cfa_offset 16 .cfi_offset w19, -8 .cfi_offset w20, -16 cmp w8, w0 b.lt LBB0_3 b LBB0_7 LBB0_2: ; %entry.if.end_crit_edge Lloh6: adrp x8, _f@GOTPAGE Lloh7: ldr x8, [x8, _f@GOTPAGEOFF] Lloh8: ldr w8, [x8] stp x20, x19, [sp, #-16]! ; 8-byte Folded Spill .cfi_def_cfa_offset 16 .cfi_offset w19, -8 .cfi_offset w20, -16 cmp w8, w0 b.ge LBB0_7 LBB0_3: ; %for.body.lr.ph Note the multiple .cfi_def* directives. Compact unwind info emission can't handle that. llvm-svn: 317726
2017-11-09 05:31:14 +08:00
; CHECK-NEXT: addq $24, %rsp
[framelowering] Skip dbg values when getting next/previous instruction. Summary: In mergeSPUpdates, debug values need to be ignored when getting the previous element, otherwise debug data could have an impact on codegen. In eliminateCallFramePseudoInstr, debug values after the erased element could have an impact on codegen and should be skipped. Closes PR31319 (https://llvm.org/bugs/show_bug.cgi?id=31319) Reviewers: aprantl, MatzeB, mkuper Subscribers: gbedwell, llvm-commits Differential Revision: https://reviews.llvm.org/D27688 llvm-svn: 290955
2017-01-04 20:08:35 +08:00
; CHECK: popq %rbx
; CHECK-NEXT: popq %r14
; CHECK-NEXT: retq
declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64)
declare i64 @fn1(i64, i64)
declare void @printf(...)
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
!llvm.dbg.cu = !{!1}
!llvm.module.flags = !{!15, !16}
!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang version 4.0.0")
!2 = !DIFile(filename: "test.cpp", directory: "")
!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!15 = !{i32 2, !"Dwarf Version", i32 4}
!16 = !{i32 2, !"Debug Info Version", i32 3}
!18 = distinct !DISubprogram(name: "test", scope: !2, file: !2, line: 5, unit: !1)
!22 = !DILocalVariable(name: "i", scope: !18, file: !2, line: 6, type: !11)
!23 = !DILocalVariable(name: "j", scope: !18, file: !2, line: 7, type: !11)
!33 = !DIExpression()
!34 = !DILocation(line: 7, column: 17, scope: !18)
!35 = !DILocation(line: 6, column: 8, scope: !18)
!36 = !DILocation(line: 9, column: 3, scope: !18)
!37 = !DILocation(line: 10, column: 10, scope: !18)