derek.holloway
7502bf64a4
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61 lines
1.7 KiB
LLVM
61 lines
1.7 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; This testcase used to hit an assert during ISel. For details, see the big
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; comment inside the function.
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; CHECK-LABEL: foo:
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; The AND should be turned into a subreg access.
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; CHECK-NOT: and
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; The shift (leal) should be folded into the scale of the address in the load.
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; CHECK-NOT: leal
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; CHECK: movl {{.*}},4),
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target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
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target triple = "i386-apple-macosx10.6.0"
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define void @foo(i32 %a) {
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bb:
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br label %bb1692
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bb1692:
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%tmp1694 = phi i32 [ 0, %bb ], [ %tmp1745, %bb1692 ]
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%xor = xor i32 0, %tmp1694
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; %load1 = (load (and (shl %xor, 2), 1020))
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%tmp1701 = shl i32 %xor, 2
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%tmp1702 = and i32 %tmp1701, 1020
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%tmp1703 = getelementptr inbounds [1028 x i8], ptr null, i32 0, i32 %tmp1702
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%load1 = load i32, ptr %tmp1703, align 4
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; %load2 = (load (shl (and %xor, 255), 2))
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%tmp1698 = and i32 %xor, 255
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%tmp1706 = shl i32 %tmp1698, 2
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%tmp1707 = getelementptr inbounds [1028 x i8], ptr null, i32 0, i32 %tmp1706
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%load2 = load i32, ptr %tmp1707, align 4
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%tmp1710 = or i32 %load2, %a
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; While matching xor we address-match %load1. The and-of-shift reassocication
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; in address matching transform this into into a shift-of-and and the resuting
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; node becomes identical to %load2. CSE replaces %load1 which leaves its
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; references in MatchScope and RecordedNodes stale.
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%tmp1711 = xor i32 %load1, %tmp1710
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%tmp1744 = getelementptr inbounds [256 x i32], ptr null, i32 0, i32 %tmp1711
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store i32 0, ptr %tmp1744, align 4
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%tmp1745 = add i32 %tmp1694, 1
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indirectbr ptr undef, [label %bb1756, label %bb1692]
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bb1756:
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br label %bb2705
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bb2705:
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indirectbr ptr undef, [label %bb5721, label %bb5736]
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bb5721:
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br label %bb2705
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bb5736:
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ret void
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}
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