forked from OSchip/llvm-project
140 lines
3.3 KiB
LLVM
140 lines
3.3 KiB
LLVM
; RUN: opt < %s -lcssa -loop-simplify -indvars -S | FileCheck %s
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
; PR28272, PR28825
|
|
; When LoopSimplify separates nested loops, it might break LCSSA form: values
|
|
; from the original loop might be used in the outer loop. This test invokes
|
|
; loop-unroll, which calls loop-simplify before itself. If LCSSA is broken
|
|
; after loop-simplify, we crash on assertion.
|
|
|
|
; CHECK-LABEL: @foo
|
|
define void @foo() {
|
|
entry:
|
|
br label %header
|
|
|
|
header:
|
|
br label %loop1
|
|
|
|
loop1:
|
|
br i1 true, label %loop1, label %bb43
|
|
|
|
bb43:
|
|
%a = phi i32 [ undef, %loop1 ], [ 0, %bb45 ], [ %a, %bb54 ]
|
|
%b = phi i32 [ 0, %loop1 ], [ 1, %bb54 ], [ %c, %bb45 ]
|
|
br i1 true, label %bb114, label %header
|
|
|
|
bb114:
|
|
%c = add i32 0, 1
|
|
%d = add i32 0, 1
|
|
br i1 true, label %bb45, label %bb54
|
|
|
|
bb45:
|
|
%x = add i32 %d, 0
|
|
br label %bb43
|
|
|
|
bb54:
|
|
br label %bb43
|
|
}
|
|
|
|
; CHECK-LABEL: @foo2
|
|
define void @foo2() {
|
|
entry:
|
|
br label %outer
|
|
|
|
outer.loopexit:
|
|
br label %outer
|
|
|
|
outer:
|
|
br label %loop1
|
|
|
|
loop1:
|
|
br i1 true, label %loop1, label %loop2.preheader
|
|
|
|
loop2.preheader:
|
|
%a.ph = phi i32 [ undef, %loop1 ]
|
|
%b.ph = phi i32 [ 0, %loop1 ]
|
|
br label %loop2
|
|
|
|
loop2:
|
|
%a = phi i32 [ 0, %loop2.if.true ], [ %a, %loop2.if.false ], [ %a.ph, %loop2.preheader ], [0, %bb]
|
|
%b = phi i32 [ 1, %loop2.if.false ], [ %c, %loop2.if.true ], [ %b.ph, %loop2.preheader ], [%c, %bb]
|
|
br i1 true, label %loop2.if, label %outer.loopexit
|
|
|
|
loop2.if:
|
|
%c = add i32 0, 1
|
|
switch i32 undef, label %loop2.if.false [i32 0, label %loop2.if.true
|
|
i32 1, label %bb]
|
|
|
|
loop2.if.true:
|
|
br i1 undef, label %loop2, label %bb
|
|
|
|
loop2.if.false:
|
|
br label %loop2
|
|
|
|
bb:
|
|
br label %loop2
|
|
}
|
|
|
|
; When LoopSimplify separates nested loops, it might break LCSSA form: values
|
|
; from the original loop might be used in exit blocks of the outer loop.
|
|
; CHECK-LABEL: @foo3
|
|
define void @foo3() {
|
|
entry:
|
|
br label %bb1
|
|
|
|
bb1:
|
|
br i1 undef, label %bb2, label %bb1
|
|
|
|
bb2:
|
|
%a = phi i32 [ undef, %bb1 ], [ %a, %bb3 ], [ undef, %bb5 ]
|
|
br i1 undef, label %bb3, label %bb1
|
|
|
|
bb3:
|
|
%b = load i32*, i32** undef
|
|
br i1 undef, label %bb2, label %bb4
|
|
|
|
bb4:
|
|
br i1 undef, label %bb5, label %bb6
|
|
|
|
bb5:
|
|
br i1 undef, label %bb2, label %bb4
|
|
|
|
bb6:
|
|
br i1 undef, label %bb_end, label %bb1
|
|
|
|
bb_end:
|
|
%x = getelementptr i32, i32* %b
|
|
br label %bb_end
|
|
}
|
|
|
|
; When LoopSimplify separates nested loops, it might break LCSSA form: values
|
|
; from the original loop might occur in a loop, which is now a sibling of the
|
|
; original loop (before separating it was a subloop of the original loop, and
|
|
; thus didn't require an lcssa phi nodes).
|
|
; CHECK-LABEL: @foo4
|
|
define void @foo4() {
|
|
bb1:
|
|
br label %bb2
|
|
|
|
; CHECK: bb2.loopexit:
|
|
bb2.loopexit: ; preds = %bb3
|
|
%i.ph = phi i32 [ 0, %bb3 ]
|
|
br label %bb2
|
|
|
|
; CHECK: bb2.outer:
|
|
; CHECK: bb2:
|
|
bb2: ; preds = %bb2.loopexit, %bb2, %bb1
|
|
%i = phi i32 [ 0, %bb1 ], [ %i, %bb2 ], [ %i.ph, %bb2.loopexit ]
|
|
%x = load i32, i32* undef, align 8
|
|
br i1 undef, label %bb2, label %bb3.preheader
|
|
|
|
; CHECK: bb3.preheader:
|
|
bb3.preheader: ; preds = %bb2
|
|
; CHECK: %x.lcssa = phi i32 [ %x, %bb2 ]
|
|
br label %bb3
|
|
|
|
bb3: ; preds = %bb3.preheader, %bb3
|
|
%y = add i32 2, %x
|
|
br i1 true, label %bb2.loopexit, label %bb3
|
|
}
|