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aarch64: fix up regalloc2 semantics. (#4830)

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This PR removes all uses of modify-operands in the aarch64 backend,
replacing them with reused-input operands instead. This has the nice
effect of removing a bunch of move instructions and more clearly
representing inputs and outputs.

This PR also removes the explicit use of pinned vregs in the aarch64
backend, instead using fixed-register constraints on the operands when
insts or pseudo-inst sequences require certain registers.

This is the second PR in the regalloc-semantics cleanup series; after
the remaining backend (s390x) and the ABI code are cleaned up as well,
we'll be able to simplify the regalloc2 frontend.
This commit is contained in:
Chris Fallin
2022-09-01 14:25:20 -07:00
committed by GitHub
parent ac2d4c4818
commit ae5fe8a728
25 changed files with 1098 additions and 886 deletions
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cranelift/filetests/filetests/isa/aarch64/amodes.clif
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@@ -139,7 +139,7 @@ block0(v0: i64):
; block0:
; movz w3, #51712
; movk w3, #15258, LSL #16
; movk w3, w3, #15258, LSL #16
; add x3, x3, x0
; ldr w0, [x3]
; ret