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ARM64: Use ADR and ADRP to form constants.

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Thanks to Peter Cawley. #1100
This commit is contained in:
Mike Pall 2023-10-08 22:10:02 +02:00
parent 14866a6828
commit d2a5487fd7
2 changed files with 31 additions and 7 deletions
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36
src/lj_emit_arm64.h
View File

@ -193,6 +193,32 @@ static int emit_kdelta(ASMState *as, Reg rd, uint64_t k, int is64)
return 0; /* Failed. */
}
#define glofs(as, k) \
((intptr_t)((uintptr_t)(k) - (uintptr_t)&J2GG(as->J)->g))
#define mcpofs(as, k) \
((intptr_t)((uintptr_t)(k) - (uintptr_t)(as->mcp - 1)))
#define checkmcpofs(as, k) \
(A64F_S_OK(mcpofs(as, k)>>2, 19))
/* Try to form a const as ADR or ADRP or ADRP + ADD. */
static int emit_kadrp(ASMState *as, Reg rd, uint64_t k)
{
A64Ins ai = A64I_ADR;
int64_t ofs = mcpofs(as, k);
if (!A64F_S_OK((uint64_t)ofs, 21)) {
uint64_t kpage = k & ~0xfffull;
MCode *adrp = as->mcp - 1 - (k != kpage);
ofs = (int64_t)(kpage - ((uint64_t)adrp & ~0xfffull)) >> 12;
if (!A64F_S_OK(ofs, 21))
return 0; /* Failed. */
if (k != kpage)
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);
return 1;
}
static void emit_loadk(ASMState *as, Reg rd, uint64_t u64)
{
int zeros = 0, ones = 0, neg, lshift = 0;
@ -213,6 +239,9 @@ static void emit_loadk(ASMState *as, Reg rd, uint64_t u64)
if (emit_kdelta(as, rd, u64, is64)) {
return;
}
if (emit_kadrp(as, rd, u64)) { /* Either 1 or 2 ins. */
return;
}
}
if (neg) {
u64 = ~u64;
@ -240,13 +269,6 @@ static void emit_loadk(ASMState *as, Reg rd, uint64_t u64)
/* Load a 64 bit constant into a GPR. */
#define emit_loadu64(as, rd, i) emit_loadk(as, rd, i)
#define glofs(as, k) \
((intptr_t)((uintptr_t)(k) - (uintptr_t)&J2GG(as->J)->g))
#define mcpofs(as, k) \
((intptr_t)((uintptr_t)(k) - (uintptr_t)(as->mcp - 1)))
#define checkmcpofs(as, k) \
(A64F_S_OK(mcpofs(as, k)>>2, 19))
static Reg ra_allock(ASMState *as, intptr_t k, RegSet allow);
/* Get/set from constant pointer. */

2
src/lj_target_arm64.h
View File

@ -234,6 +234,8 @@ typedef enum A64Ins {
A64I_MOVZx = 0xd2800000,
A64I_MOVNw = 0x12800000,
A64I_MOVNx = 0x92800000,
A64I_ADR = 0x10000000,
A64I_ADRP = 0x90000000,
A64I_LDRB = 0x39400000,
A64I_LDRH = 0x79400000,