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llvm-project/llvm/test/Analysis/LazyValueAnalysis/lvi-after-jumpthreading.ll

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; RUN: opt < %s -jump-threading -print-lvi-after-jump-threading -disable-output 2>&1 | FileCheck %s
; Testing LVI cache after jump-threading
; Jump-threading transforms the IR below to one where
; loop and backedge basic blocks are merged into one.
; basic block (named backedge) with the branch being:
; %cont = icmp slt i32 %iv.next, 400
; br i1 %cont, label %backedge, label %exit
define i8 @test1(i32 %a, i32 %length) {
; CHECK-LABEL: LVI for function 'test1':
entry:
; CHECK-LABEL: entry:
; CHECK-NEXT: ; LatticeVal for: 'i32 %a' is: overdefined
; CHECK-NEXT: ; LatticeVal for: 'i32 %length' is: overdefined
br label %loop
; CHECK-LABEL: backedge:
; CHECK-NEXT: ; LatticeVal for: 'i32 %a' is: overdefined
; CHECK-NEXT: ; LatticeVal for: 'i32 %length' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%backedge' is: constantrange<0, 400>
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%exit' is: constantrange<399, 400>
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%backedge' is: constantrange<1, 401>
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%exit' is: constantrange<400, 401>
; CHECK-NEXT: %iv.next = add nsw i32 %iv, 1
; CHECK-NEXT: ; LatticeVal for: ' %cont = icmp slt i32 %iv.next, 400' in BB: '%backedge' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %cont = icmp slt i32 %iv.next, 400' in BB: '%exit' is: constantrange<0, -1>
; CHECK-NEXT: %cont = icmp slt i32 %iv.next, 400
; CHECK-NOT: loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%cnd = icmp sge i32 %iv, 0
br i1 %cnd, label %backedge, label %exit
backedge:
%iv.next = add nsw i32 %iv, 1
%cont = icmp slt i32 %iv.next, 400
br i1 %cont, label %loop, label %exit
exit:
ret i8 0
}
; Here JT does not transform the code, but LVICache is populated during the processing of blocks.
define i8 @test2(i32 %n) {
; CHECK-LABEL: LVI for function 'test2':
; CHECK-LABEL: entry:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: br label %loop
entry:
br label %loop
; CHECK-LABEL: loop:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%loop' is: constantrange<0, 400>
; CHECK-DAG: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%backedge' is: constantrange<0, -2147483648>
; CHECK-DAG: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%exit' is: constantrange<0, -2147483648>
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
; CHECK-NEXT: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%loop' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%backedge' is: constantrange<1, -2147483648>
; CHECK-DAG: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%exit' is: overdefined
; CHECK-NEXT: %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]
%iv2 = phi i32 [%n, %entry], [%iv2.next, %backedge]
; CHECK-NEXT: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%loop' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%backedge' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%exit' is: overdefined
; CHECK-NEXT: %cnd1 = icmp sge i32 %iv, 0
%cnd1 = icmp sge i32 %iv, 0
%cnd2 = icmp sgt i32 %iv2, 0
; CHECK: %cnd2 = icmp sgt i32 %iv2, 0
; CHECK: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%loop' is: constantrange<-1, -1>
; CHECK-DAG: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%backedge' is: constantrange<-1, 0>
; CHECK-DAG: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%exit' is: overdefined
; CHECK-NEXT: %cnd = and i1 %cnd1, %cnd2
%cnd = and i1 %cnd1, %cnd2
br i1 %cnd, label %backedge, label %exit
; CHECK-LABEL: backedge:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%backedge' is: constantrange<1, -2147483648>
; CHECK-NEXT: %iv.next = add nsw i32 %iv, 1
backedge:
%iv.next = add nsw i32 %iv, 1
%iv2.next = sub nsw i32 %iv2, 1
; CHECK: ; LatticeVal for: ' %cont1 = icmp slt i32 %iv.next, 400' in BB: '%backedge' is: overdefined
; CHECK-NEXT: %cont1 = icmp slt i32 %iv.next, 400
%cont1 = icmp slt i32 %iv.next, 400
; CHECK-NEXT: ; LatticeVal for: ' %cont2 = icmp sgt i32 %iv2.next, 0' in BB: '%backedge' is: overdefined
; CHECK-NEXT: %cont2 = icmp sgt i32 %iv2.next, 0
%cont2 = icmp sgt i32 %iv2.next, 0
; CHECK-NEXT: ; LatticeVal for: ' %cont = and i1 %cont1, %cont2' in BB: '%backedge' is: constantrange<-1, -1>
; CHECK-NEXT: %cont = and i1 %cont1, %cont2
%cont = and i1 %cont1, %cont2
br i1 %cont, label %loop, label %exit
exit:
ret i8 0
}
; Merging cont block into do block. Make sure that we do not incorrectly have the cont
; LVI info as LVI info for the beginning of do block. LVI info for %i is Range[0,1)
; at beginning of cont Block, which is incorrect at the beginning of do block.
define i32 @test3(i32 %i, i1 %f, i32 %n) {
; CHECK-LABEL: LVI for function 'test3':
; CHECK-LABEL: entry
; CHECK: ; LatticeVal for: 'i32 %i' is: overdefined
; CHECK: %c = icmp ne i32 %i, -2134
; CHECK: br i1 %c, label %cont, label %exit
entry:
%c = icmp ne i32 %i, -2134
br i1 %c, label %do, label %exit
exit:
%c1 = icmp ne i32 %i, -42
br i1 %c1, label %exit2, label %exit
; CHECK-LABEL: cont:
; Here cont is merged to do and i is any value except -2134.
; i is not the single value: zero.
; CHECK-NOT: ; LatticeVal for: 'i32 %i' is: constantrange<0, 1>
; CHECK: ; LatticeVal for: 'i32 %i' is: constantrange<-2133, -2134>
; CHECK: ; LatticeVal for: ' %cond.0 = icmp sgt i32 %i, 0' in BB: '%cont' is: overdefined
; CHECK: %cond.0 = icmp sgt i32 %i, 0
; CHECK: %consume = call i32 @consume
; CHECK: %cond = icmp eq i32 %i, 0
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %cond)
; CHECK: %cond.3 = icmp sgt i32 %i, %n
; CHECK: br i1 %cond.3, label %exit2, label %exit
cont:
%cond.3 = icmp sgt i32 %i, %n
br i1 %cond.3, label %exit2, label %exit
do:
%cond.0 = icmp sgt i32 %i, 0
%consume = call i32 @consume(i1 %cond.0)
%cond = icmp eq i32 %i, 0
call void (i1, ...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
%cond.2 = icmp sgt i32 %i, 0
br i1 %cond.2, label %exit, label %cont
exit2:
; CHECK-LABEL: exit2:
; LatticeVal for: 'i32 %i' is: constantrange<-2134, 1>
ret i32 30
}
; FIXME: We should be able to merge cont into do.
; When we do so, LVI for cont cannot be the one for the merged do block.
define i32 @test4(i32 %i, i1 %f, i32 %n) {
; CHECK-LABEL: LVI for function 'test4':
entry:
%c = icmp ne i32 %i, -2134
br i1 %c, label %do, label %exit
exit: ; preds = %do, %cont, %exit, %entry
%c1 = icmp ne i32 %i, -42
br i1 %c1, label %exit2, label %exit
cont: ; preds = %do
; CHECK-LABEL: cont:
; CHECK: ; LatticeVal for: 'i1 %f' is: constantrange<-1, 0>
; CHECK: call void @dummy(i1 %f)
call void @dummy(i1 %f)
br label %exit2
do: ; preds = %entry
; CHECK-LABEL: do:
; CHECK: ; LatticeVal for: 'i1 %f' is: overdefined
; CHECK: call void @dummy(i1 %f)
; CHECK: br i1 %cond, label %exit, label %cont
call void @dummy(i1 %f)
%consume = call i32 @exit()
call void @llvm.assume(i1 %f)
%cond = icmp eq i1 %f, false
br i1 %cond, label %exit, label %cont
exit2: ; preds = %cont, %exit
ret i32 30
}
declare i32 @exit()
declare i32 @consume(i1)
declare void @llvm.assume(i1) nounwind
declare void @dummy(i1) nounwind
declare void @llvm.experimental.guard(i1, ...)
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