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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
14 lines
443 B
LLVM
14 lines
443 B
LLVM
; RUN: llc < %s -march=systemz | grep rll
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target datalayout = "E-p:64:64:64-i8:8:16-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-a0:16:16"
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target triple = "s390x-linux"
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define i32 @rotl(i32 %x, i32 %y, i32 %z) nounwind readnone {
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entry:
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%shl = shl i32 %x, 1 ; <i32> [#uses=1]
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%sub = sub i32 32, 1 ; <i32> [#uses=1]
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%shr = lshr i32 %x, %sub ; <i32> [#uses=1]
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%or = or i32 %shr, %shl ; <i32> [#uses=1]
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ret i32 %or
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}
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