llvm-mirror/fold-vector-shl-crash.ll at 1f39c2f6233f44907872b76793276c576cd51588 - llvm-mirror - Git.je (Gitea)

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Pawel Bylica 4cfe4f6645 Reapply r240291: Fix shl folding in DAG combiner.

The code responsible for shl folding in the DAGCombiner was assuming incorrectly that all constants are less than 64 bits. This patch simply changes the way values are compared.

It has been reverted previously because of some problems with comparing APInt with raw uint64_t. That has been fixed/changed with r241204.

llvm-svn: 241254

2015-07-02 11:44:54 +00:00

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 ; RUN: llc < %s -march=x86-64 | FileCheck %s
 ; RUN: llc < %s -march=x86    | FileCheck %s
 ;CHECK-LABEL: test
 define <2 x i256> @test() {
   %S = shufflevector <2 x i256> zeroinitializer, <2 x i256> <i256 -1, i256 -1>, <2 x i32> <i32 0, i32 2>
   %B = shl <2 x i256> %S, <i256 -1, i256 -1> ; DAG Combiner crashes here
   ret <2 x i256> %B
 }