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ARM64: Use ldr literal to load FP constants.

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Thanks to Peter Cawley. #1255
This commit is contained in:
Mike Pall 2024-08-21 11:31:29 +02:00
parent 304da39cc5
commit c68711cc87
2 changed files with 12 additions and 6 deletions
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17
src/lj_emit_arm64.h
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@ -109,6 +109,11 @@ static void emit_d(ASMState *as, A64Ins ai, Reg rd)
*--as->mcp = ai | A64F_D(rd);
}
static void emit_dl(ASMState *as, A64Ins ai, Reg rd, uint32_t l)
{
*--as->mcp = ai | A64F_D(rd) | A64F_S19(l >> 2);
}
static void emit_n(ASMState *as, A64Ins ai, Reg rn)
{
*--as->mcp = ai | A64F_N(rn);
@ -226,7 +231,7 @@ static int emit_kadrp(ASMState *as, Reg rd, uint64_t k)
emit_dn(as, (A64I_ADDx^A64I_K12)|A64F_U12(k - kpage), rd, rd);
ai = A64I_ADRP;
}
emit_d(as, ai|(((uint32_t)ofs&3)<<29)|A64F_S19(ofs>>2), rd);
emit_dl(as, ai|(((uint32_t)ofs&3)<<29), rd, ofs);
return 1;
}
@ -291,7 +296,7 @@ static void emit_lsptr(ASMState *as, A64Ins ai, Reg r, void *p)
/* GL + offset, might subsequently fuse to LDP/STP. */
} else if (ai == A64I_LDRx && checkmcpofs(as, p)) {
/* IP + offset is cheaper than allock, but address must be in range. */
emit_d(as, A64I_LDRLx | A64F_S19(mcpofs(as, p)>>2), r);
emit_dl(as, A64I_LDRLx, r, mcpofs(as, p));
return;
} else { /* Split up into base reg + offset. */
int64_t i64 = i64ptr(p);
@ -320,15 +325,15 @@ static void emit_loadk64(ASMState *as, Reg r, IRIns *ir)
if (emit_checkofs(A64I_LDRx, ofs)) {
emit_lso(as, r >= RID_MAX_GPR ? A64I_LDRd : A64I_LDRx,
(r & 31), RID_GL, ofs);
} else if (checkmcpofs(as, k)) {
emit_dl(as, r >= RID_MAX_GPR ? A64I_LDRLd : A64I_LDRLx,
(r & 31), mcpofs(as, k));
} else {
if (r >= RID_MAX_GPR) {
emit_dn(as, A64I_FMOV_D_R, (r & 31), RID_TMP);
r = RID_TMP;
}
if (checkmcpofs(as, k))
emit_d(as, A64I_LDRLx | A64F_S19(mcpofs(as, k)>>2), r);
else
emit_loadu64(as, r, *k);
emit_loadu64(as, r, *k);
}
}

1
src/lj_target_arm64.h
View File

@ -281,6 +281,7 @@ typedef enum A64Ins {
A64I_FSQRTd = 0x1e61c000,
A64I_LDRs = 0xbd400000,
A64I_LDRd = 0xfd400000,
A64I_LDRLd = 0x5c000000,
A64I_STRs = 0xbd000000,
A64I_STRd = 0xfd000000,
A64I_LDPs = 0x2d400000,