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f2282cac95
Unfortunately, this in turn led to some lower quality SCEVs due to some different paths through expression simplification, so add getUDivExactExpr and use it. This fixes all instances of the problems that I found, but we can make that function smarter as necessary. Merge test "xor-and.ll" into "and-xor.ll" since I needed to update it anyways. Test 'nsw-offset.ll' analyzes a little deeper, %n now gets a scev in terms of %no instead of a SCEVUnknown. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200203 91177308-0d34-0410-b5e6-96231b3b80d8
28 lines
628 B
LLVM
28 lines
628 B
LLVM
; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
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; CHECK-LABEL: @test1
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; CHECK: --> (zext
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; CHECK: --> (zext
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; CHECK-NOT: --> (zext
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define i32 @test1(i32 %x) {
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%n = and i32 %x, 255
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%y = xor i32 %n, 255
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ret i32 %y
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}
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; ScalarEvolution shouldn't try to analyze %z into something like
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; --> (zext i4 (-1 + (-1 * (trunc i64 (8 * %x) to i4))) to i64)
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; or
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; --> (8 * (zext i1 (trunc i64 ((8 * %x) /u 8) to i1) to i64))
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; CHECK-LABEL: @test2
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; CHECK: --> (8 * (zext i1 (trunc i64 %x to i1) to i64))
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define i64 @test2(i64 %x) {
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%a = shl i64 %x, 3
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%t = and i64 %a, 8
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%z = xor i64 %t, 8
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ret i64 %z
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}
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