157 lines
3.4 KiB
LLVM
157 lines
3.4 KiB
LLVM
; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
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define i32 @f0(i32 %x, i32 %y) {
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; CHECK-LABEL: Classifying expressions for: @f0
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entry:
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%c = icmp sgt i32 %y, 0
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br i1 %c, label %add, label %merge
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add:
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%sum = add i32 %x, %y
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br label %merge
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merge:
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%v = phi i32 [ %sum, %add ], [ %x, %entry ]
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; CHECK: %v = phi i32 [ %sum, %add ], [ %x, %entry ]
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; CHECK-NEXT: --> ((0 smax %y) + %x) U: full-set S: full-set
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ret i32 %v
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}
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define i32 @f1(i32 %x, i32 %y) {
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; CHECK-LABEL: Classifying expressions for: @f1
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entry:
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%c = icmp sge i32 %y, 0
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br i1 %c, label %add, label %merge
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add:
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%sum = add i32 %x, %y
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br label %merge
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merge:
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%v = phi i32 [ %sum, %add ], [ %x, %entry ]
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; CHECK: %v = phi i32 [ %sum, %add ], [ %x, %entry ]
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; CHECK-NEXT: --> ((0 smax %y) + %x) U: full-set S: full-set
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ret i32 %v
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}
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define i32 @f2(i32 %x, i32 %y, i32* %ptr) {
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; CHECK-LABEL: Classifying expressions for: @f2
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entry:
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%c = icmp sge i32 %y, 0
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br i1 %c, label %add, label %merge
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add:
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%lv = load i32, i32* %ptr
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br label %merge
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merge:
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%v = phi i32 [ %lv, %add ], [ %x, %entry ]
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; CHECK: %v = phi i32 [ %lv, %add ], [ %x, %entry ]
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; CHECK-NEXT: --> %v U: full-set S: full-set
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ret i32 %v
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}
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define i32 @f3(i32 %x, i32 %init, i32 %lim) {
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; CHECK-LABEL: Classifying expressions for: @f3
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ %init, %entry ], [ %iv.inc, %merge ]
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%iv.inc = add i32 %iv, 1
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%c = icmp sge i32 %iv, 0
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br i1 %c, label %add, label %merge
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add:
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%sum = add i32 %x, %iv
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br label %merge
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merge:
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%v = phi i32 [ %sum, %add ], [ %x, %loop ]
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; CHECK: %v = phi i32 [ %sum, %add ], [ %x, %loop ]
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; CHECK-NEXT: --> ((0 smax {%init,+,1}<%loop>) + %x) U: full-set S: full-set
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%be.cond = icmp eq i32 %iv.inc, %lim
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br i1 %be.cond, label %loop, label %leave
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leave:
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ret i32 0
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}
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define i32 @f4(i32 %x, i32 %init, i32 %lim) {
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; CHECK-LABEL: Classifying expressions for: @f4
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entry:
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%c = icmp sge i32 %init, 0
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br i1 %c, label %add, label %merge
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add:
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br label %loop
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loop:
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%iv = phi i32 [ %init, %add ], [ %iv.inc, %loop ]
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%iv.inc = add i32 %iv, 1
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%be.cond = icmp eq i32 %iv.inc, %lim
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br i1 %be.cond, label %loop, label %add.cont
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add.cont:
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%sum = add i32 %x, %iv
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br label %merge
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merge:
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%v = phi i32 [ %sum, %add.cont ], [ %x, %entry ]
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; CHECK: %v = phi i32 [ %sum, %add.cont ], [ %x, %entry ]
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; CHECK-NEXT: --> %v U: full-set S: full-set
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ret i32 %v
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}
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define i32 @f5(i32* %val) {
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; CHECK-LABEL: Classifying expressions for: @f5
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entry:
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br label %for.end
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for.condt:
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br i1 true, label %for.cond.0, label %for.end
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for.end:
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%inc = load i32, i32* %val
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br i1 false, label %for.condt, label %for.cond.0
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for.cond.0:
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%init = phi i32 [ 0, %for.condt ], [ %inc, %for.end ]
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; CHECK: %init = phi i32 [ 0, %for.condt ], [ %inc, %for.end ]
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; CHECK-NEXT: --> %init U: full-set S: full-set
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; Matching "through" %init will break LCSSA at the SCEV expression
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; level.
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ret i32 %init
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}
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define i32 @f6(i32 %x, i32 %y) {
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; Do the right thing for unreachable code:
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; CHECK-LABEL: Classifying expressions for: @f6
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entry:
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%c0 = icmp sgt i32 %y, 0
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%sum = add i32 %x, %y
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br i1 %c0, label %merge, label %leave_1
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merge:
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%v0 = phi i32 [ %sum, %entry ], [ %v1, %unreachable ]
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%c1 = icmp slt i32 %y, 0
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br i1 %c1, label %leave_0, label %leave_0_cond
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leave_0_cond:
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br label %leave_0
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leave_0:
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%v1 = phi i32 [ %v0, %merge ], [ 0, %leave_0_cond ]
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ret i32 0
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leave_1:
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ret i32 0
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unreachable:
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br label %merge
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}
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