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[PowerPC] fast isel can lower intrinsics call on AIX. 

Reviewed By: qiucf

Differential Revision: https://reviews.llvm.org/D114778
This commit is contained in:
Chen Zheng 2021-11-30 08:34:05 +00:00
parent a500f7f48f
commit 2c46ca96e2
3 changed files with 58 additions and 11 deletions
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5
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -1775,12 +1775,13 @@ bool FastISel::selectOperator(const User *I, unsigned Opcode) {
return false;
case Instruction::Call:
// On AIX, call lowering uses the DAG-ISEL path currently so that the
// On AIX, normal call lowering uses the DAG-ISEL path currently so that the
// callee of the direct function call instruction will be mapped to the
// symbol for the function's entry point, which is distinct from the
// function descriptor symbol. The latter is the symbol whose XCOFF symbol
// name is the C-linkage name of the source level function.
if (TM.getTargetTriple().isOSAIX())
// But fast isel still has the ability to do selection for intrinsics.
if (TM.getTargetTriple().isOSAIX() && !isa<IntrinsicInst>(I))
return false;
return selectCall(I);

9
llvm/lib/Target/PowerPC/PPCFastISel.cpp
View File

@ -1966,15 +1966,6 @@ bool PPCFastISel::fastSelectInstruction(const Instruction *I) {
return SelectBinaryIntOp(I, ISD::OR);
case Instruction::Sub:
return SelectBinaryIntOp(I, ISD::SUB);
case Instruction::Call:
// On AIX, call lowering uses the DAG-ISEL path currently so that the
// callee of the direct function call instruction will be mapped to the
// symbol for the function's entry point, which is distinct from the
// function descriptor symbol. The latter is the symbol whose XCOFF symbol
// name is the C-linkage name of the source level function.
if (TM.getTargetTriple().isOSAIX())
break;
return selectCall(I);
case Instruction::Ret:
return SelectRet(I);
case Instruction::Trunc:

55
llvm/test/CodeGen/PowerPC/debug-label-fast-isel.ll Normal file
View File

@ -0,0 +1,55 @@
; RUN: llc < %s -mtriple powerpc64-ibm-aix-xcoff | FileCheck %s --check-prefix=CHECKASM
; This is a case copied from test/DebugInfo/Generic/debug-label-mi.ll. This test
; is to explicitly check that fast isel for XCOFF works as expected for debug
; related intrinsics.
; CHECKASM: DEBUG_LABEL: foo:top
; CHECKASM: DEBUG_LABEL: foo:done
source_filename = "debug-label-mi.c"
; Function Attrs: noinline nounwind optnone
define i32 @foo(i32 signext %a, i32 signext %b) #0 !dbg !4 {
entry:
%a.addr = alloca i32, align 4
%b.addr = alloca i32, align 4
%sum = alloca i32, align 4
store i32 %a, i32* %a.addr, align 4
store i32 %b, i32* %b.addr, align 4
br label %top
top: ; preds = %entry
call void @llvm.dbg.label(metadata !8), !dbg !9
%0 = load i32, i32* %a.addr, align 4
%1 = load i32, i32* %b.addr, align 4
%add = add nsw i32 %0, %1
store i32 %add, i32* %sum, align 4
br label %done
done: ; preds = %top
call void @llvm.dbg.label(metadata !10), !dbg !11
%2 = load i32, i32* %sum, align 4
ret i32 %2
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.label(metadata)
attributes #0 = { noinline nounwind optnone uwtable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "debug-label-mi.c", directory: "./")
!2 = !{}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, unit: !0, retainedNodes: !2)
!5 = !DISubroutineType(types: !6)
!6 = !{!7, !7, !7}
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!8 = !DILabel(scope: !4, name: "top", file: !1, line: 4)
!9 = !DILocation(line: 4, column: 1, scope: !4)
!10 = !DILabel(scope: !4, name: "done", file: !1, line: 7)
!11 = !DILocation(line: 7, column: 1, scope: !4)