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https://github.com/c64scene-ar/llvm-6502.git
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d40d03e1bd
(OP (trunc x), (trunc y)) -> (trunc (OP x, y)) Unfortunately this simple change causes dag combine to infinite looping. The problem is the shrink demanded ops optimization tend to canonicalize expressions in the opposite manner. That is badness. This patch disable those optimizations in dag combine but instead it is done as a late pass in sdisel. This also exposes some deficiencies in dag combine and x86 setcc / brcond lowering. Teach them to look pass ISD::TRUNCATE in various places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92849 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.0 KiB
LLVM
44 lines
1.0 KiB
LLVM
; RUN: llc < %s -march=bfin > %t
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; XFAIL: *
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; DAGCombiner::SimplifyBinOpWithSameOpcodeHands can produce an illegal i16 OR
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; operation after LegalizeOps.
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define void @mng_display_bgr565() {
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entry:
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br i1 false, label %bb.preheader, label %return
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bb.preheader:
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br i1 false, label %cond_true48, label %cond_next80
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cond_true48:
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%tmp = load i8* null
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%tmp51 = zext i8 %tmp to i16
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%tmp99 = load i8* null
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%tmp54 = bitcast i8 %tmp99 to i8
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%tmp54.upgrd.1 = zext i8 %tmp54 to i32
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%tmp55 = lshr i32 %tmp54.upgrd.1, 3
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%tmp55.upgrd.2 = trunc i32 %tmp55 to i16
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%tmp52 = shl i16 %tmp51, 5
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%tmp56 = and i16 %tmp55.upgrd.2, 28
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%tmp57 = or i16 %tmp56, %tmp52
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%tmp60 = zext i16 %tmp57 to i32
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%tmp62 = xor i32 0, 65535
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%tmp63 = mul i32 %tmp60, %tmp62
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%tmp65 = add i32 0, %tmp63
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%tmp69 = add i32 0, %tmp65
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%tmp70 = lshr i32 %tmp69, 16
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%tmp70.upgrd.3 = trunc i32 %tmp70 to i16
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%tmp75 = lshr i16 %tmp70.upgrd.3, 8
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%tmp75.upgrd.4 = trunc i16 %tmp75 to i8
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%tmp76 = lshr i8 %tmp75.upgrd.4, 5
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store i8 %tmp76, i8* null
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ret void
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cond_next80:
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ret void
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return:
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ret void
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}
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