zextload.ll
2.67 KB
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; RUN: opt -S -codegenprepare < %s | FileCheck %s
;
; This test case was generated from the following source code:
;
; long long foo(int *ptr, int cond) {
; long long result = 3;
; unsigned val = *ptr; // line 3
; switch (cond) {
; case 3:
; result = val; // line 6
; break;
; case 4:
; result += 2;
; }
;
; return result + val;
; };
;
; When CGP moves a zext Z of a load L to the block where L lives, Z should not
; retain its original debug location. Instead, Z should reuse the debug location
; associated with L. Logically the zero extend will become part of the load; the
; code generator will attempt to fuse the two instructions into a zextload.
; CHECK-LABEL: @test
; CHECK: [[LOADVAL:%[0-9]+]] = load i32, i32* %ptr, align 4, !dbg [[DEBUGLOC:![0-9]+]]
; CHECK-NEXT: zext i32 [[LOADVAL]] to i64, !dbg [[DEBUGLOC]]
; CHECK: [[DEBUGLOC]] = !DILocation(line: 3
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i64 @test(i32* %ptr, i32 %cond) !dbg !5 {
entry:
%0 = load i32, i32* %ptr, align 4, !dbg !7
switch i32 %cond, label %sw.epilog [
i32 3, label %sw.bb
i32 4, label %sw.bb1
], !dbg !8
sw.bb: ; preds = %entry
%conv = zext i32 %0 to i64, !dbg !9
br label %sw.epilog, !dbg !10
sw.bb1: ; preds = %entry
br label %sw.epilog, !dbg !11
sw.epilog: ; preds = %sw.bb1, %entry, %sw.bb
%result.0 = phi i64 [ 3, %entry ], [ 5, %sw.bb1 ], [ %conv, %sw.bb ]
%conv2 = zext i32 %0 to i64, !dbg !12
%add3 = add nuw nsw i64 %result.0, %conv2, !dbg !13
ret i64 %add3, !dbg !14
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
!1 = !DIFile(filename: "test.c", directory: "")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 1, type: !6, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
!6 = !DISubroutineType(types: !2)
!7 = !DILocation(line: 3, column: 18, scope: !5)
!8 = !DILocation(line: 4, column: 3, scope: !5)
!9 = !DILocation(line: 6, column: 14, scope: !5)
!10 = !DILocation(line: 7, column: 5, scope: !5)
!11 = !DILocation(line: 10, column: 3, scope: !5)
!12 = !DILocation(line: 12, column: 19, scope: !5)
!13 = !DILocation(line: 12, column: 17, scope: !5)
!14 = !DILocation(line: 12, column: 3, scope: !5)