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Simplify right rotations.

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This commit is contained in:
Michael Munday 2017-01-30 16:24:06 -05:00
parent a06bfc99f7
commit 8141ca5d63
1 changed files with 1 additions and 6 deletions
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7
src/vm_s390x.dasc
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@ -1899,7 +1899,6 @@ static void build_subroutines(BuildCtx *ctx)
| // Note: no inline conversion from number for 2nd argument!
| lg RA, 8(BASE)
| checkint RA, ->fff_fallback
| // Note: no need to limit rotate to 5-bits (wraps).
| rll RB, RB, 0(RA)
| j ->fff_resbit
|
@ -1907,11 +1906,7 @@ static void build_subroutines(BuildCtx *ctx)
| // Note: no inline conversion from number for 2nd argument!
| lg RA, 8(BASE)
| checkint RA, ->fff_fallback
| // TODO: shorter sequence of instructions to convert right rotate into left rotate.
| nill RA, 0x1f
| lghi TMPR0, 32
| sr TMPR0, RA
| lr RA, TMPR0
| lcr RA, RA // Right rotate equivalent to negative left rotate.
| rll RB, RB, 0(RA)
| j ->fff_resbit
|