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

; RUN: llc < %s -march=x86-64 | FileCheck %s

define i64 @test(i64 %A) {
; CHECK: @test
; CHECK: shrq $54
; CHECK: andl $1020
; CHECK: ret
    %B = lshr i64 %A, 56
    %C = shl i64 %B, 2
    ret i64 %C
}
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132809 91177308-0d34-0410-b5e6-96231b3b80d8 2011-06-09 22:14:44 +00:00			`; 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245432 91177308-0d34-0410-b5e6-96231b3b80d8 2015-08-19 11:35:10 +00:00			`; 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132809 91177308-0d34-0410-b5e6-96231b3b80d8 2011-06-09 22:14:44 +00:00			`; CHECK: ret`
			`%B = lshr i64 %A, 56`
			`%C = shl i64 %B, 2`
			`ret i64 %C`
			`}`