[PATCH] D14489: [AArch64] Applying load pair optimization for volatile load/store
Jun Bum Lim via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 13 13:16:44 PST 2015
junbuml added a comment.
I'm not sure if I understand correctly. It will be helpful if you clarify below four cases ?
1.I guess this must be safe if ldp read [x0, #0] and then [x0, #8] ?
ldr x9, [x0]
ldr x8, [x0, #8] (volatile)
; into
ldp x9, x8, [x0]
2.Is this safe ?
ldr x8, [x0, #8] (volatile)
ldr x9, [x0]
; into
ldp x9, x8, [x0]
3.Is this not safe ?
ldr x9, [x0] (volatile)
ldr x8, [x0, #8] (volatile)
; into
ldp x9, x8, [x0]
4.what about this case?
ldr x9, [x0]
ldr x10, [x1]
ldr x8, [x0, #8] (volatile)
; into
ldr x10, [x1]
ldp x9, x9, [x0]
http://reviews.llvm.org/D14489
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