llvm-mirror/shift-pair.ll at a789af41623bcd459886d8a818694727f887ab72 - llvm-mirror - Git.je (Gitea)

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Eli Friedman 14c6ce9041 Change this DAGCombine to build AND of SHR instead of SHR of AND; this matches the ordering we prefer in instcombine. Part of rdar://9562809.

The potential DAGCombine which enforces this more generally messes up some other very fragile patterns, so I'm leaving that alone, at least for now.

llvm-svn: 132809

2011-06-09 22:14:44 +00:00

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 ; RUN: llc < %s -march=x86-64 | FileCheck %s
 define i64 @test(i64 %A) {
 ; CHECK: @test
 ; CHECK: shrq $54
 ; CHECK: andq $1020
 ; CHECK: ret
     %B = lshr i64 %A, 56
     %C = shl i64 %B, 2
     ret i64 %C
 }