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x86-asm: Fix signed constants and opcode order

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Two things: negative constants were rejected (e.g. "add $-15,%eax").
Second the insn order was such that the arithmetic IM8S forms
weren't used (always the IM32 ones).  Switching them prefers those
but requires a fix for size calculation in case the opcodes were
OPC_ARITH and OPC_WLX (whose size starts with 1, not zero).
This commit is contained in:
Michael Matz 2016-05-14 04:33:41 +02:00
parent 080ec9fadd
commit 4f27e217a8
4 changed files with 12 additions and 3 deletions
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4
i386-asm.c
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@ -355,7 +355,7 @@ static void parse_operand(TCCState *s1, Operand *op)
if (op->e.v == (uint16_t)op->e.v)
op->type |= OP_IM16;
#ifdef TCC_TARGET_X86_64
if (op->e.v != (uint32_t)op->e.v)
if (op->e.v != (int32_t)op->e.v)
op->type = OP_IM64;
#endif
}
@ -551,6 +551,8 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
if (!(opcode >= pa->sym && opcode < pa->sym + 8*NBWLX))
continue;
s = (opcode - pa->sym) % NBWLX;
if ((pa->instr_type & OPC_BWLX) == OPC_WLX)
s++;
} else if (pa->instr_type & OPC_SHIFT) {
if (!(opcode >= pa->sym && opcode < pa->sym + 7*NBWLX))
continue;

2
i386-asm.h
View File

@ -157,8 +157,8 @@ ALT(DEF_ASM_OP2(lgs, 0x0fb5, 0, OPC_MODRM, OPT_EA, OPT_REG32))
ALT(DEF_ASM_OP2(addb, 0x00, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_REG, OPT_EA | OPT_REG)) /* XXX: use D bit ? */
ALT(DEF_ASM_OP2(addb, 0x02, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_EA | OPT_REG, OPT_REG))
ALT(DEF_ASM_OP2(addb, 0x04, 0, OPC_ARITH | OPC_BWLX, OPT_IM, OPT_EAX))
ALT(DEF_ASM_OP2(addb, 0x80, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_IM, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(addw, 0x83, 0, OPC_ARITH | OPC_MODRM | OPC_WLX, OPT_IM8S, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(addb, 0x80, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_IM, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(testb, 0x84, 0, OPC_MODRM | OPC_BWLX, OPT_REG, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(testb, 0x84, 0, OPC_MODRM | OPC_BWLX, OPT_EA | OPT_REG, OPT_REG))

7
tests/asmtest.S
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@ -156,6 +156,8 @@ movl %ebx, %fs
addl $0x123, %eax
add $0x123, %ebx
add $-16, %ecx
add $-0x123, %esi
addl $0x123, 0x100
addl $0x123, 0x100(%ebx)
addl $0x123, 0x100(%ebx,%edx,2)
@ -216,6 +218,8 @@ add (%ebx), %dl
div %bl
div %ecx, %eax
and $15,%bx
and $-20,%edx
shl %edx
shl $10, %edx
@ -690,3 +694,6 @@ ft1: ft2: ft3: ft4: ft5: ft6: ft7: ft8: ft9:
.type ft8,"function"
pause
.rept 6
nop
.endr

2
x86_64-asm.h
View File

@ -166,8 +166,8 @@ ALT(DEF_ASM_OP2(lgs, 0x0fb5, 0, OPC_MODRM, OPT_EA, OPT_REG32))
ALT(DEF_ASM_OP2(addb, 0x00, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_REG, OPT_EA | OPT_REG)) /* XXX: use D bit ? */
ALT(DEF_ASM_OP2(addb, 0x02, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_EA | OPT_REG, OPT_REG))
ALT(DEF_ASM_OP2(addb, 0x04, 0, OPC_ARITH | OPC_BWLX, OPT_IM, OPT_EAX))
ALT(DEF_ASM_OP2(addb, 0x80, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_IM, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(addw, 0x83, 0, OPC_ARITH | OPC_MODRM | OPC_WLX, OPT_IM8S, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(addb, 0x80, 0, OPC_ARITH | OPC_MODRM | OPC_BWLX, OPT_IM, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(testb, 0x84, 0, OPC_MODRM | OPC_BWLX, OPT_REG, OPT_EA | OPT_REG))
ALT(DEF_ASM_OP2(testb, 0x84, 0, OPC_MODRM | OPC_BWLX, OPT_EA | OPT_REG, OPT_REG))