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caa5d4f15d
This is a common pattern with dyn_cast and similar constructs, when the PHI no longer depends on the select it can often be turned into a simpler construct or even get hoisted out of the loop. PR15340. llvm-svn: 175995
202 lines
4.1 KiB
LLVM
202 lines
4.1 KiB
LLVM
; RUN: opt < %s -correlated-propagation -S | FileCheck %s
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; PR2581
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; CHECK: @test1
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define i32 @test1(i1 %C) nounwind {
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br i1 %C, label %exit, label %body
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body: ; preds = %0
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; CHECK-NOT: select
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%A = select i1 %C, i32 10, i32 11 ; <i32> [#uses=1]
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; CHECK: ret i32 11
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ret i32 %A
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exit: ; preds = %0
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; CHECK: ret i32 10
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ret i32 10
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}
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; PR4420
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declare i1 @ext()
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; CHECK: @test2
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define i1 @test2() {
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entry:
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%cond = tail call i1 @ext() ; <i1> [#uses=2]
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br i1 %cond, label %bb1, label %bb2
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bb1: ; preds = %entry
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%cond2 = tail call i1 @ext() ; <i1> [#uses=1]
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br i1 %cond2, label %bb3, label %bb2
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bb2: ; preds = %bb1, %entry
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; CHECK-NOT: phi i1
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%cond_merge = phi i1 [ %cond, %entry ], [ false, %bb1 ] ; <i1> [#uses=1]
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; CHECK: ret i1 false
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ret i1 %cond_merge
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bb3: ; preds = %bb1
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%res = tail call i1 @ext() ; <i1> [#uses=1]
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; CHECK: ret i1 %res
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ret i1 %res
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}
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; PR4855
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@gv = internal constant i8 7
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; CHECK: @test3
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define i8 @test3(i8* %a) nounwind {
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entry:
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%cond = icmp eq i8* %a, @gv
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br i1 %cond, label %bb2, label %bb
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bb: ; preds = %entry
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ret i8 0
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bb2: ; preds = %entry
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; CHECK: %should_be_const = load i8* @gv
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%should_be_const = load i8* %a
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ret i8 %should_be_const
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}
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; PR1757
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; CHECK: @test4
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define i32 @test4(i32) {
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EntryBlock:
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; CHECK: icmp sgt i32 %0, 2
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%.demorgan = icmp sgt i32 %0, 2
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br i1 %.demorgan, label %GreaterThanTwo, label %LessThanOrEqualToTwo
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GreaterThanTwo:
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; CHECK-NOT: icmp eq i32 %0, 2
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icmp eq i32 %0, 2
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; CHECK: br i1 false
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br i1 %1, label %Impossible, label %NotTwoAndGreaterThanTwo
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NotTwoAndGreaterThanTwo:
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ret i32 2
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Impossible:
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ret i32 1
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LessThanOrEqualToTwo:
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ret i32 0
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}
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declare i32* @f(i32*)
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define void @test5(i32* %x, i32* %y) {
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; CHECK: @test5
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entry:
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%pre = icmp eq i32* %x, null
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br i1 %pre, label %return, label %loop
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loop:
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%phi = phi i32* [ %sel, %loop ], [ %x, %entry ]
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; CHECK: %phi = phi i32* [ %f, %loop ], [ %x, %entry ]
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%f = tail call i32* @f(i32* %phi)
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%cmp1 = icmp ne i32* %f, %y
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%sel = select i1 %cmp1, i32* %f, i32* null
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%cmp2 = icmp eq i32* %sel, null
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br i1 %cmp2, label %return, label %loop
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return:
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ret void
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}
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define i32 @switch1(i32 %s) {
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; CHECK: @switch1
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entry:
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%cmp = icmp slt i32 %s, 0
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br i1 %cmp, label %negative, label %out
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negative:
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switch i32 %s, label %out [
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; CHECK: switch i32 %s, label %out
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i32 0, label %out
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; CHECK-NOT: i32 0
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i32 1, label %out
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; CHECK-NOT: i32 1
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i32 -1, label %next
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; CHECK: i32 -1, label %next
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i32 -2, label %next
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; CHECK: i32 -2, label %next
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i32 2, label %out
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; CHECK-NOT: i32 2
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i32 3, label %out
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; CHECK-NOT: i32 3
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]
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out:
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%p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %negative ], [ 0, %negative ]
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ret i32 %q
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}
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define i32 @switch2(i32 %s) {
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; CHECK: @switch2
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entry:
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%cmp = icmp sgt i32 %s, 0
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br i1 %cmp, label %positive, label %out
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positive:
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switch i32 %s, label %out [
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i32 0, label %out
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i32 -1, label %next
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i32 -2, label %next
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]
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; CHECK: br label %out
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out:
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%p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %positive ], [ 0, %positive ]
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ret i32 %q
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}
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define i32 @switch3(i32 %s) {
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; CHECK: @switch3
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entry:
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%cmp = icmp sgt i32 %s, 0
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br i1 %cmp, label %positive, label %out
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positive:
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switch i32 %s, label %out [
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i32 -1, label %out
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i32 -2, label %next
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i32 -3, label %next
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]
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; CHECK: br label %out
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out:
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%p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
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ret i32 %p
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next:
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%q = phi i32 [ 0, %positive ], [ 0, %positive ]
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ret i32 %q
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}
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define void @switch4(i32 %s) {
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; CHECK: @switch4
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entry:
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%cmp = icmp eq i32 %s, 0
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br i1 %cmp, label %zero, label %out
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zero:
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switch i32 %s, label %out [
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i32 0, label %next
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i32 1, label %out
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i32 -1, label %out
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]
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; CHECK: br label %next
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out:
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ret void
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next:
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ret void
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}
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