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llvm-project/llvm/test/DebugInfo/Generic/instcombine-phi.ll

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; RUN: opt -instcombine -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; If all the operands to a phi node are of the same operation, instcombine
; will try to pull them through the phi node, combining them into a single
; operation. Check that when it does this the combined operation does not
; have a debug location set.
; Test folding of a binary operation. Generated from source:
; extern int foo(void);
; extern int bar(void);
;
; int binop(int a, int b) {
; if(a)
; b -= foo();
; else
; b -= bar();
; return b;
; }
; CHECK: define i32 @binop
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: sub nsw i32 %b, %[[PHI]]
; CHECK-NOT: !dbg
; CHECK: ret i32
define i32 @binop(i32 %a, i32 %b) !dbg !6 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !8
br i1 %tobool, label %if.then, label %if.else, !dbg !8
if.then: ; preds = %entry
%call = call i32 @foo(), !dbg !9
%sub = sub nsw i32 %b, %call, !dbg !10
br label %if.end, !dbg !11
if.else: ; preds = %entry
%call1 = call i32 @bar(), !dbg !12
%sub2 = sub nsw i32 %b, %call1, !dbg !13
br label %if.end
if.end: ; preds = %if.else, %if.then
%b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
ret i32 %b.addr.0, !dbg !14
}
; Test folding of a compare. Generated from source (with editing to
; common the zext):
; extern int foo(void);
; extern int bar(void);
;
; int cmp(int a, int b) {
; int r;
; if(a)
; r = foo() < b;
; else
; r = bar() < b;
; return r;
; }
; CHECK: define i32 @cmp
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: icmp slt i32 %[[PHI]], %b
; CHECK-NOT: !dbg
; CHECK: ret i32
define i32 @cmp(i32 %a, i32 %b) !dbg !15 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !16
br i1 %tobool, label %if.then, label %if.else, !dbg !16
if.then: ; preds = %entry
%call = call i32 @foo(), !dbg !17
%cmp = icmp slt i32 %call, %b, !dbg !18
br label %if.end, !dbg !19
if.else: ; preds = %entry
%call1 = call i32 @bar(), !dbg !20
%cmp2 = icmp slt i32 %call1, %b, !dbg !21
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i1 [ %cmp, %if.then ], [ %cmp2, %if.else ]
%conv = zext i1 %r.0 to i32
ret i32 %conv, !dbg !22
}
; Test folding of getelementptr. Generated from source:
; extern long long foo2(void);
; extern long long bar2(void);
;
; int *gep(int a, int *b) {
; int *r;
; if(a)
; r = &b[foo2()];
; else
; r = &b[bar2()];
; return p;
; }
; CHECK: define i32* @gep
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i64 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: getelementptr inbounds i32, i32* %b, i64 %[[PHI]]
; CHECK-NOT: !dbg
; CHECK: ret i32*
define i32* @gep(i32 %a, i32* %b) !dbg !23 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !24
br i1 %tobool, label %if.then, label %if.else, !dbg !24
if.then: ; preds = %entry
%call = call i64 @foo2(), !dbg !25
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %call, !dbg !26
br label %if.end, !dbg !27
if.else: ; preds = %entry
%call1 = call i64 @bar2(), !dbg !28
%arrayidx2 = getelementptr inbounds i32, i32* %b, i64 %call1, !dbg !29
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i32* [ %arrayidx, %if.then ], [ %arrayidx2, %if.else ]
ret i32* %r.0, !dbg !30
}
; Test folding of load. Generated from source:
; extern int *foo3(void);
; extern int *bar3(void);
;
; int load(int a) {
; int r;
; if(a)
; r = *foo3();
; else
; r = *bar3();
; return r;
; }
; CHECK: define i32 @load
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32* [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: load i32, i32* %[[PHI]]
; CHECK-NOT: !dbg
; CHECK: ret i32
define i32 @load(i32 %a) !dbg !31 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !32
br i1 %tobool, label %if.then, label %if.else, !dbg !32
if.then: ; preds = %entry
%call = call i32* @foo3(), !dbg !33
%0 = load i32, i32* %call, align 4, !dbg !34
br label %if.end, !dbg !35
if.else: ; preds = %entry
%call1 = call i32* @bar3(), !dbg !36
%1 = load i32, i32* %call1, align 4, !dbg !37
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i32 [ %0, %if.then ], [ %1, %if.else ]
ret i32 %r.0, !dbg !38
}
; Test folding of a cast. Generated from source:
; extern int foo(void);
; extern int bar(void);
;
; long long cast(int a) {
; long long r;
; if(a)
; r = foo();
; else
; r = bar();
; return r;
; }
; CHECK: define i64 @cast
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: sext i32 %[[PHI]] to i64
; CHECK-NOT: !dbg
; CHECK: ret i64
define i64 @cast(i32 %a) !dbg !39 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !40
br i1 %tobool, label %if.then, label %if.else, !dbg !40
if.then: ; preds = %entry
%call = call i32 @foo(), !dbg !41
%conv = sext i32 %call to i64, !dbg !41
br label %if.end, !dbg !42
if.else: ; preds = %entry
%call1 = call i32 @bar(), !dbg !43
%conv2 = sext i32 %call1 to i64, !dbg !43
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i64 [ %conv, %if.then ], [ %conv2, %if.else ]
ret i64 %r.0, !dbg !44
}
; Test folding of a binary op with a RHS constant. Generated from source:
; extern int foo(void);
; extern int bar(void);
;
; int binop_const(int a) {
; int r;
; if(a)
; r = foo() - 5;
; else
; r = bar() - 5;
; return r;
; }
; CHECK: define i32 @binop_const
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: add nsw i32 %[[PHI]], -5
; CHECK-NOT: !dbg
; CHECK: ret i32
define i32 @binop_const(i32 %a) !dbg !45 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !46
br i1 %tobool, label %if.then, label %if.else, !dbg !46
if.then: ; preds = %entry
%call = call i32 @foo(), !dbg !47
%sub = sub nsw i32 %call, 5, !dbg !48
br label %if.end, !dbg !49
if.else: ; preds = %entry
%call1 = call i32 @bar(), !dbg !50
%sub2 = sub nsw i32 %call1, 5, !dbg !51
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
ret i32 %r.0, !dbg !52
}
; Test folding of a compare with RHS constant. Generated from source (with
; editing to common the zext):
; extern int foo(void);
; extern int bar(void);
;
; int cmp_const(int a) {
; int r;
; if(a)
; r = foo() < 10;
; else
; r = bar() < 10;
; return r;
; }
; CHECK: define i32 @cmp_const
; CHECK-LABEL: if.end:
; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
; CHECK: icmp slt i32 %[[PHI]], 10
; CHECK-NOT: !dbg
; CHECK: ret i32
define i32 @cmp_const(i32 %a) !dbg !53 {
entry:
%tobool = icmp ne i32 %a, 0, !dbg !54
br i1 %tobool, label %if.then, label %if.else, !dbg !54
if.then: ; preds = %entry
%call = call i32 @foo(), !dbg !55
%cmp = icmp slt i32 %call, 10, !dbg !56
br label %if.end, !dbg !57
if.else: ; preds = %entry
%call1 = call i32 @bar(), !dbg !58
%cmp2 = icmp slt i32 %call1, 10, !dbg !59
br label %if.end
if.end: ; preds = %if.else, %if.then
%r.0 = phi i1 [ %cmp, %if.then ], [ %cmp2, %if.else ]
%conv = zext i1 %r.0 to i32
ret i32 %conv, !dbg !60
}
declare i32 @foo()
declare i32 @bar()
declare i64 @foo2()
declare i64 @bar2()
declare i32* @foo3()
declare i32* @bar3()
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, 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}
!6 = distinct !DISubprogram(name: "binop", scope: !1, file: !1, line: 8, type: !7, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!7 = !DISubroutineType(types: !2)
!8 = !DILocation(line: 9, column: 6, scope: !6)
!9 = !DILocation(line: 10, column: 10, scope: !6)
!10 = !DILocation(line: 10, column: 7, scope: !6)
!11 = !DILocation(line: 10, column: 5, scope: !6)
!12 = !DILocation(line: 12, column: 10, scope: !6)
!13 = !DILocation(line: 12, column: 7, scope: !6)
!14 = !DILocation(line: 13, column: 3, scope: !6)
!15 = distinct !DISubprogram(name: "cmp", scope: !1, file: !1, line: 16, type: !7, isLocal: false, isDefinition: true, scopeLine: 16, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!16 = !DILocation(line: 18, column: 6, scope: !15)
!17 = !DILocation(line: 19, column: 9, scope: !15)
!18 = !DILocation(line: 19, column: 15, scope: !15)
!19 = !DILocation(line: 19, column: 5, scope: !15)
!20 = !DILocation(line: 21, column: 9, scope: !15)
!21 = !DILocation(line: 21, column: 15, scope: !15)
!22 = !DILocation(line: 22, column: 3, scope: !15)
!23 = distinct !DISubprogram(name: "gep", scope: !1, file: !1, line: 25, type: !7, isLocal: false, isDefinition: true, scopeLine: 25, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!24 = !DILocation(line: 27, column: 6, scope: !23)
!25 = !DILocation(line: 28, column: 12, scope: !23)
!26 = !DILocation(line: 28, column: 10, scope: !23)
!27 = !DILocation(line: 28, column: 5, scope: !23)
!28 = !DILocation(line: 30, column: 12, scope: !23)
!29 = !DILocation(line: 30, column: 10, scope: !23)
!30 = !DILocation(line: 31, column: 3, scope: !23)
!31 = distinct !DISubprogram(name: "load", scope: !1, file: !1, line: 34, type: !7, isLocal: false, isDefinition: true, scopeLine: 34, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!32 = !DILocation(line: 36, column: 6, scope: !31)
!33 = !DILocation(line: 37, column: 10, scope: !31)
!34 = !DILocation(line: 37, column: 9, scope: !31)
!35 = !DILocation(line: 37, column: 5, scope: !31)
!36 = !DILocation(line: 39, column: 10, scope: !31)
!37 = !DILocation(line: 39, column: 9, scope: !31)
!38 = !DILocation(line: 40, column: 3, scope: !31)
!39 = distinct !DISubprogram(name: "cast", scope: !1, file: !1, line: 43, type: !7, isLocal: false, isDefinition: true, scopeLine: 43, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!40 = !DILocation(line: 45, column: 6, scope: !39)
!41 = !DILocation(line: 46, column: 9, scope: !39)
!42 = !DILocation(line: 46, column: 5, scope: !39)
!43 = !DILocation(line: 48, column: 9, scope: !39)
!44 = !DILocation(line: 49, column: 3, scope: !39)
!45 = distinct !DISubprogram(name: "binop_const", scope: !1, file: !1, line: 52, type: !7, isLocal: false, isDefinition: true, scopeLine: 52, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!46 = !DILocation(line: 54, column: 6, scope: !45)
!47 = !DILocation(line: 55, column: 9, scope: !45)
!48 = !DILocation(line: 55, column: 15, scope: !45)
!49 = !DILocation(line: 55, column: 5, scope: !45)
!50 = !DILocation(line: 57, column: 9, scope: !45)
!51 = !DILocation(line: 57, column: 15, scope: !45)
!52 = !DILocation(line: 58, column: 3, scope: !45)
!53 = distinct !DISubprogram(name: "cmp_const", scope: !1, file: !1, line: 61, type: !7, isLocal: false, isDefinition: true, scopeLine: 61, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!54 = !DILocation(line: 63, column: 6, scope: !53)
!55 = !DILocation(line: 64, column: 9, scope: !53)
!56 = !DILocation(line: 64, column: 15, scope: !53)
!57 = !DILocation(line: 64, column: 5, scope: !53)
!58 = !DILocation(line: 66, column: 9, scope: !53)
!59 = !DILocation(line: 66, column: 15, scope: !53)
!60 = !DILocation(line: 67, column: 3, scope: !53)
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