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Clean up register allocations and comments slightly.

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Move RB from r12 to r13 so that it no longer overlaps with the
GOT pointer (to avoid potential problems with PIC compilation).
This commit is contained in:
Michael Munday 2017-01-11 16:16:51 -05:00
parent 084ab26280
commit c8db1b960c
1 changed files with 9 additions and 9 deletions
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16
src/vm_s390x.dasc
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@ -9,7 +9,7 @@
|// r6 | parameter | saved |
|// r7-r11 | | saved |
|// r12 | GOT pointer (needed?) | saved |
|// r13 | literal pool (needed?) | saved |
|// r13 | literal pool (not needed) | saved |
|// r14 | return address | volatile |
|// r15 | stack pointer | saved |
|// f0,f2,f4,f6 | parameter and return value | volatile |
@ -41,13 +41,13 @@
|.define KBASE, r8 // Constants of current Lua function.
|.define PC, r9 // Next PC.
|.define DISPATCH, r10 // Opcode dispatch table.
|.define ITYPE, r11 //
|.define ITYPE, r11 // Temporary used for type information.
|
|// The following temporaries are not saved across C calls, except for RD.
|// The following temporaries are not saved across C calls, except for RB.
|.define RA, r1
|.define RB, r12
|.define RB, r13 // Must be callee-save.
|.define RC, r5 // Overlaps CARG4.
|.define RD, r6 // Overlaps CARG5. Callee-saved.
|.define RD, r6 // Overlaps CARG5.
|
|// Calling conventions. Also used as temporaries.
|.define CARG1, r2
@ -484,7 +484,7 @@ static void build_subroutines(BuildCtx *ctx)
|->vm_resume: // Setup C frame and resume thread.
| // (lua_State *L, TValue *base, int nres1 = 0, ptrdiff_t ef = 0)
| saveregs
| lgr L:RB, CARG1 // Caveat: CARG1 may be RA.
| lgr L:RB, CARG1
| stg CARG1, SAVE_L
| lgr RA, CARG2
| lghi PC, FRAME_CP
@ -752,7 +752,7 @@ static void build_subroutines(BuildCtx *ctx)
| la RB, 0(RB, BASE)
|2:
| lg L:CARG1, SAVE_L
| stg BASE, L:CARG1->base // Caveat: CARG2/CARG3 may be BASE.
| stg BASE, L:CARG1->base
| lgr CARG2, RB
| lgr CARG3, RC
| lgr L:RB, L:CARG1
@ -4071,7 +4071,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| lay RA, (8*LUA_MINSTACK)(RD)
| clg RA, L:RB->maxstack
| stg RD, L:RB->top
| lgr CARG1, L:RB // Caveat: CARG1 may be RA.
| lgr CARG1, L:RB
if (op != BC_FUNCC) {
| lgr CARG2, KBASE
}