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llvm-project/llvm/test/CodeGen/X86/shift-pair.ll

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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
2011-06-10 06:14:44 +08:00
; RUN: llc < %s -march=x86-64 | FileCheck %s
define i64 @test(i64 %A) {
; CHECK: @test
; CHECK: shrq $54
Revert "[X86] Widen the 'AND' mask if doing so shrinks the encoding size" This reverts commit 245169 which miscompiles MultiSource/Applications/siod from LNT. llvm-svn: 245432
2015-08-19 19:35:10 +08:00
; CHECK: andl $1020
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
2011-06-10 06:14:44 +08:00
; CHECK: ret
%B = lshr i64 %A, 56
%C = shl i64 %B, 2
ret i64 %C
}