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s390x: simplify ceil/floor code #246

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s390x: simplify ceil/floor code #246

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10 changes: 1 addition & 9 deletions src/vm_s390x.dasc
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Original file line number Diff line number Diff line change
Expand Up @@ -2126,16 +2126,8 @@ static void build_subroutines(BuildCtx *ctx)
|// Value to round is in f0. May clobber f0-f7 and r0. Return address is r14.
|.macro vm_round, name, mask
|->name:
| ldr f4, f0
| lghi r0, 1
| cdfbr f1, r0
| didbr f0, f2, f1, mask // f0=remainder, f2=quotient.
| fidbra f4, mask, f4, 0
| ldr f0, f4
| jnle >1
| fidbra f0, mask, f0, 0
| br r14
|1: // partial remainder (sanity check)
| stg r0, 0
|.endmacro
|
| vm_round vm_floor, 7 // Round towards -inf.
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