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ARM64: Emit more efficient trace exits.

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Contributed by Djordje Kovacevic and Stefan Pejic from RT-RK.com.
This commit is contained in:
Mike Pall
2016-11-24 18:56:19 +01:00
parent 1131fa22a2
commit 81259898ea
3 changed files with 57 additions and 61 deletions
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31
src/vm_arm64.dasc
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@@ -1927,22 +1927,21 @@ static void build_subroutines(BuildCtx *ctx)
| stp d30, d31, [sp, #30*8]
| ldr CARG1, [sp, #64*8] // Load original value of lr.
| add CARG3, sp, #64*8 // Recompute original value of sp.
| mv_vmstate CARG4, EXIT
| ldr CARG2w, [CARG1, #-4]! // Get exit instruction.
| stp CARG1, CARG3, [sp, #62*8] // Store exit pc/sp in RID_LR/RID_SP.
| lsl CARG2, CARG2, #38
| add CARG1, CARG1, CARG2, asr #36
| ldr CARG2w, [lr] // Load exit stub group offset.
| sub CARG1, CARG1, lr
| sub CARG1, CARG1, #4
| ldr L, GL->cur_L
| add CARG1, CARG2, CARG1, lsr #2 // Compute exit number.
| ldr BASE, GL->jit_base
| st_vmstate CARG4
| str CARG1w, [GL, #GL_J(exitno)]
| str BASE, L->base
| str L, [GL, #GL_J(L)]
| str xzr, GL->jit_base
| mv_vmstate CARG4, EXIT
| stp xzr, CARG3, [sp, #62*8] // Store 0/sp in RID_LR/RID_SP.
| sub CARG1, CARG1, lr
| ldr L, GL->cur_L
| lsr CARG1, CARG1, #2
| ldr BASE, GL->jit_base
| sub CARG1, CARG1, #2
| ldr CARG2w, [lr] // Load trace number.
| st_vmstate CARG4
| str BASE, L->base
| ubfx CARG2w, CARG2w, #5, #16
| str CARG1w, [GL, #GL_J(exitno)]
| str CARG2w, [GL, #GL_J(parent)]
| str L, [GL, #GL_J(L)]
| str xzr, GL->jit_base
| add CARG1, GL, #GG_G2J
| mov CARG2, sp
| bl extern lj_trace_exit // (jit_State *J, ExitState *ex)