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py/emitnative: Clean up int-indexed Viper load/store code.

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This commit performs some minor clean up for the code involved in Viper
load/store operations when said operations have an integer index.

Most platform-specific code blocks were able to generate correct opcodes
even when the index is 0, but they would still fall back to the general
case.  The general case would still emit a shortened opcode sequence so
this commit does not alter the overall behaviour, but makes it easier to
extend platform-specific code whenever the full index range is going to
be handled rather than a subset of indices as it is now.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
This commit is contained in:
Alessandro Gatti
2025-05-08 00:02:26 +02:00
parent 6b2792a097
commit 3d19a8bc2d
1 changed files with 99 additions and 99 deletions
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62
py/emitnative.c
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@@ -1537,11 +1537,8 @@ static void emit_native_load_subscr(emit_t *emit) {
switch (vtype_base) {
case VTYPE_PTR8: {
// pointer to 8-bit memory
// TODO optimise to use thumb ldrb r1, [r2, r3]
if (index_value != 0) {
// index is non-zero
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_ldrb_rlo_rlo_i5(emit->as, REG_RET, reg_base, index_value);
break;
}
@@ -1551,11 +1548,13 @@ static void emit_native_load_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
if (index_value >= 0 && index_value < 256) {
asm_xtensa_op_l8ui(emit->as, REG_RET, reg_base, index_value);
break;
}
#endif
if (index_value != 0) {
// index is non-zero
need_reg_single(emit, reg_index, 0);
ASM_MOV_REG_IMM(emit->as, reg_index, index_value);
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add index to base
@@ -1566,10 +1565,8 @@ static void emit_native_load_subscr(emit_t *emit) {
}
case VTYPE_PTR16: {
// pointer to 16-bit memory
if (index_value != 0) {
// index is a non-zero immediate
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_ldrh_rlo_rlo_i5(emit->as, REG_RET, reg_base, index_value);
break;
}
@@ -1579,11 +1576,13 @@ static void emit_native_load_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
if (index_value >= 0 && index_value < 256) {
asm_xtensa_op_l16ui(emit->as, REG_RET, reg_base, index_value);
break;
}
#endif
if (index_value != 0) {
// index is a non-zero immediate
need_reg_single(emit, reg_index, 0);
ASM_MOV_REG_IMM(emit->as, reg_index, index_value << 1);
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add 2*index to base
@@ -1594,10 +1593,8 @@ static void emit_native_load_subscr(emit_t *emit) {
}
case VTYPE_PTR32: {
// pointer to 32-bit memory
if (index_value != 0) {
// index is a non-zero immediate
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_ldr_rlo_rlo_i5(emit->as, REG_RET, reg_base, index_value);
break;
}
@@ -1607,11 +1604,13 @@ static void emit_native_load_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
if (index_value >= 0 && index_value < 256) {
asm_xtensa_l32i_optimised(emit->as, REG_RET, reg_base, index_value);
break;
}
#endif
if (index_value != 0) {
// index is a non-zero immediate
need_reg_single(emit, reg_index, 0);
ASM_MOV_REG_IMM(emit->as, reg_index, index_value << 2);
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add 4*index to base
@@ -1811,10 +1810,8 @@ static void emit_native_store_subscr(emit_t *emit) {
case VTYPE_PTR8: {
// pointer to 8-bit memory
// TODO optimise to use thumb strb r1, [r2, r3]
if (index_value != 0) {
// index is non-zero
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_strb_rlo_rlo_i5(emit->as, reg_value, reg_base, index_value);
break;
}
@@ -1824,15 +1821,17 @@ static void emit_native_store_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
asm_xtensa_op_s8i(emit->as, REG_RET, reg_base, index_value);
if (index_value >= 0 && index_value < 256) {
asm_xtensa_op_s8i(emit->as, reg_value, reg_base, index_value);
break;
}
#endif
if (index_value != 0) {
// index is non-zero
ASM_MOV_REG_IMM(emit->as, reg_index, index_value);
#if N_ARM
asm_arm_strb_reg_reg_reg(emit->as, reg_value, reg_base, reg_index);
return;
break;
#endif
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add index to base
reg_base = reg_index;
@@ -1842,10 +1841,8 @@ static void emit_native_store_subscr(emit_t *emit) {
}
case VTYPE_PTR16: {
// pointer to 16-bit memory
if (index_value != 0) {
// index is a non-zero immediate
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_strh_rlo_rlo_i5(emit->as, reg_value, reg_base, index_value);
break;
}
@@ -1855,11 +1852,13 @@ static void emit_native_store_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
asm_xtensa_op_s16i(emit->as, REG_RET, reg_base, index_value);
if (index_value >= 0 && index_value < 256) {
asm_xtensa_op_s16i(emit->as, reg_value, reg_base, index_value);
break;
}
#endif
if (index_value != 0) {
// index is a non-zero immediate
ASM_MOV_REG_IMM(emit->as, reg_index, index_value << 1);
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add 2*index to base
reg_base = reg_index;
@@ -1869,10 +1868,8 @@ static void emit_native_store_subscr(emit_t *emit) {
}
case VTYPE_PTR32: {
// pointer to 32-bit memory
if (index_value != 0) {
// index is a non-zero immediate
#if N_THUMB
if (index_value > 0 && index_value < 32) {
if (index_value >= 0 && index_value < 32) {
asm_thumb_str_rlo_rlo_i5(emit->as, reg_value, reg_base, index_value);
break;
}
@@ -1882,14 +1879,17 @@ static void emit_native_store_subscr(emit_t *emit) {
break;
}
#elif N_XTENSA || N_XTENSAWIN
if (index_value > 0 && index_value < 256) {
asm_xtensa_s32i_optimised(emit->as, REG_RET, reg_base, index_value);
if (index_value >= 0 && index_value < 256) {
asm_xtensa_s32i_optimised(emit->as, reg_value, reg_base, index_value);
break;
}
#elif N_ARM
#endif
if (index_value != 0) {
// index is a non-zero immediate
#if N_ARM
ASM_MOV_REG_IMM(emit->as, reg_index, index_value);
asm_arm_str_reg_reg_reg(emit->as, reg_value, reg_base, reg_index);
return;
break;
#endif
ASM_MOV_REG_IMM(emit->as, reg_index, index_value << 2);
ASM_ADD_REG_REG(emit->as, reg_index, reg_base); // add 4*index to base