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