mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
b0598b14aa
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139842 91177308-0d34-0410-b5e6-96231b3b80d8
173 lines
4.2 KiB
LLVM
173 lines
4.2 KiB
LLVM
; RUN: opt < %s -S -indvars -loop-unroll -verify-loop-info | FileCheck %s
|
|
;
|
|
; Unit tests for loop unrolling using ScalarEvolution to compute trip counts.
|
|
;
|
|
; Indvars is run first to generate an "old" SCEV result. Some unit
|
|
; tests may check that SCEV is properly invalidated between passes.
|
|
|
|
; Completely unroll loops without a canonical IV.
|
|
;
|
|
; CHECK: @sansCanonical
|
|
; CHECK-NOT: phi
|
|
; CHECK-NOT: icmp
|
|
; CHECK: ret
|
|
define i32 @sansCanonical(i32* %base) nounwind {
|
|
entry:
|
|
br label %while.body
|
|
|
|
while.body:
|
|
%iv = phi i64 [ 10, %entry ], [ %iv.next, %while.body ]
|
|
%sum = phi i32 [ 0, %entry ], [ %sum.next, %while.body ]
|
|
%iv.next = add i64 %iv, -1
|
|
%adr = getelementptr inbounds i32* %base, i64 %iv.next
|
|
%tmp = load i32* %adr, align 8
|
|
%sum.next = add i32 %sum, %tmp
|
|
%iv.narrow = trunc i64 %iv.next to i32
|
|
%cmp.i65 = icmp sgt i32 %iv.narrow, 0
|
|
br i1 %cmp.i65, label %while.body, label %exit
|
|
|
|
exit:
|
|
ret i32 %sum
|
|
}
|
|
|
|
; SCEV unrolling properly handles loops with multiple exits. In this
|
|
; case, the computed trip count based on a canonical IV is *not* for a
|
|
; latch block. Canonical unrolling incorrectly unrolls it, but SCEV
|
|
; unrolling does not.
|
|
;
|
|
; CHECK: @earlyLoopTest
|
|
; CHECK: tail:
|
|
; CHECK-NOT: br
|
|
; CHECK: br i1 %cmp2, label %loop, label %exit2
|
|
define i64 @earlyLoopTest(i64* %base) nounwind {
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i64 [ 0, %entry ], [ %inc, %tail ]
|
|
%s = phi i64 [ 0, %entry ], [ %s.next, %tail ]
|
|
%adr = getelementptr i64* %base, i64 %iv
|
|
%val = load i64* %adr
|
|
%s.next = add i64 %s, %val
|
|
%inc = add i64 %iv, 1
|
|
%cmp = icmp ne i64 %inc, 4
|
|
br i1 %cmp, label %tail, label %exit1
|
|
|
|
tail:
|
|
%cmp2 = icmp ne i64 %val, 0
|
|
br i1 %cmp2, label %loop, label %exit2
|
|
|
|
exit1:
|
|
ret i64 %s
|
|
|
|
exit2:
|
|
ret i64 %s.next
|
|
}
|
|
|
|
; SCEV properly unrolls multi-exit loops.
|
|
;
|
|
; CHECK: @multiExit
|
|
; CHECK: getelementptr i32* %base, i32 10
|
|
; CHECK-NEXT: load i32*
|
|
; CHECK: br i1 false, label %l2.10, label %exit1
|
|
; CHECK: l2.10:
|
|
; CHECK-NOT: br
|
|
; CHECK: ret i32
|
|
define i32 @multiExit(i32* %base) nounwind {
|
|
entry:
|
|
br label %l1
|
|
l1:
|
|
%iv1 = phi i32 [ 0, %entry ], [ %inc1, %l2 ]
|
|
%iv2 = phi i32 [ 0, %entry ], [ %inc2, %l2 ]
|
|
%inc1 = add i32 %iv1, 1
|
|
%inc2 = add i32 %iv2, 1
|
|
%adr = getelementptr i32* %base, i32 %iv1
|
|
%val = load i32* %adr
|
|
%cmp1 = icmp slt i32 %iv1, 5
|
|
br i1 %cmp1, label %l2, label %exit1
|
|
l2:
|
|
%cmp2 = icmp slt i32 %iv2, 10
|
|
br i1 %cmp2, label %l1, label %exit2
|
|
exit1:
|
|
ret i32 1
|
|
exit2:
|
|
ret i32 %val
|
|
}
|
|
|
|
|
|
; SCEV should not unroll a multi-exit loops unless the latch block has
|
|
; a known trip count, regardless of the early exit trip counts. The
|
|
; LoopUnroll utility uses this assumption to optimize the latch
|
|
; block's branch.
|
|
;
|
|
; CHECK: @multiExit
|
|
; CHECK: l3:
|
|
; CHECK-NOT: br
|
|
; CHECK: br i1 %cmp3, label %l1, label %exit3
|
|
define i32 @multiExitIncomplete(i32* %base) nounwind {
|
|
entry:
|
|
br label %l1
|
|
l1:
|
|
%iv1 = phi i32 [ 0, %entry ], [ %inc1, %l3 ]
|
|
%iv2 = phi i32 [ 0, %entry ], [ %inc2, %l3 ]
|
|
%inc1 = add i32 %iv1, 1
|
|
%inc2 = add i32 %iv2, 1
|
|
%adr = getelementptr i32* %base, i32 %iv1
|
|
%val = load i32* %adr
|
|
%cmp1 = icmp slt i32 %iv1, 5
|
|
br i1 %cmp1, label %l2, label %exit1
|
|
l2:
|
|
%cmp2 = icmp slt i32 %iv2, 10
|
|
br i1 %cmp2, label %l3, label %exit2
|
|
l3:
|
|
%cmp3 = icmp ne i32 %val, 0
|
|
br i1 %cmp3, label %l1, label %exit3
|
|
|
|
exit1:
|
|
ret i32 1
|
|
exit2:
|
|
ret i32 2
|
|
exit3:
|
|
ret i32 3
|
|
}
|
|
|
|
; When loop unroll merges a loop exit with one of its parent loop's
|
|
; exits, SCEV must forget its ExitNotTaken info.
|
|
;
|
|
; CHECK: @nestedUnroll
|
|
; CHECK-NOT: br i1
|
|
; CHECK: for.body87:
|
|
define void @nestedUnroll() nounwind {
|
|
entry:
|
|
br label %for.inc
|
|
|
|
for.inc:
|
|
br i1 false, label %for.inc, label %for.body38.preheader
|
|
|
|
for.body38.preheader:
|
|
br label %for.body38
|
|
|
|
for.body38:
|
|
%i.113 = phi i32 [ %inc76, %for.inc74 ], [ 0, %for.body38.preheader ]
|
|
%mul48 = mul nsw i32 %i.113, 6
|
|
br label %for.body43
|
|
|
|
for.body43:
|
|
%j.011 = phi i32 [ 0, %for.body38 ], [ %inc72, %for.body43 ]
|
|
%add49 = add nsw i32 %j.011, %mul48
|
|
%sh_prom50 = zext i32 %add49 to i64
|
|
%inc72 = add nsw i32 %j.011, 1
|
|
br i1 false, label %for.body43, label %for.inc74
|
|
|
|
for.inc74:
|
|
%inc76 = add nsw i32 %i.113, 1
|
|
br i1 false, label %for.body38, label %for.body87.preheader
|
|
|
|
for.body87.preheader:
|
|
br label %for.body87
|
|
|
|
for.body87:
|
|
br label %for.body87
|
|
}
|
|
|