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tcg/i386: Tidy register constraint definitions 

Create symbolic constants for all low-byte-addressable
and second-byte-addressable registers.  Create a symbol
for the registers that need reserving for softmmu.

There is no functional change for 's', as this letter is
only used for i386.  The BYTEL name is correct for the
action we wish from the constraint.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2021-01-19 09:33:02 -10:00
parent c7c778b5b9
commit df903b94b3
1 changed files with 20 additions and 20 deletions
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40
tcg/i386/tcg-target.c.inc
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@ -132,6 +132,22 @@ static const int tcg_target_call_oarg_regs[] = {
# define TCG_REG_L1 TCG_REG_EDX
#endif
#define ALL_BYTEH_REGS 0x0000000fu
#if TCG_TARGET_REG_BITS == 64
# define ALL_GENERAL_REGS 0x0000ffffu
# define ALL_VECTOR_REGS 0xffff0000u
# define ALL_BYTEL_REGS ALL_GENERAL_REGS
#else
# define ALL_GENERAL_REGS 0x000000ffu
# define ALL_VECTOR_REGS 0x00ff0000u
# define ALL_BYTEL_REGS ALL_BYTEH_REGS
#endif
#ifdef CONFIG_SOFTMMU
# define SOFTMMU_RESERVE_REGS ((1 << TCG_REG_L0) | (1 << TCG_REG_L1))
#else
# define SOFTMMU_RESERVE_REGS 0
#endif
/* The host compiler should supply <cpuid.h> to enable runtime features
detection, as we're not going to go so far as our own inline assembly.
If not available, default values will be assumed. */
@ -193,14 +209,6 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
return true;
}
#if TCG_TARGET_REG_BITS == 64
#define ALL_GENERAL_REGS 0x0000ffffu
#define ALL_VECTOR_REGS 0xffff0000u
#else
#define ALL_GENERAL_REGS 0x000000ffu
#define ALL_VECTOR_REGS 0x00ff0000u
#endif
/* parse target specific constraints */
static const char *target_parse_constraint(TCGArgConstraint *ct,
const char *ct_str, TCGType type)
@ -226,11 +234,11 @@ static const char *target_parse_constraint(TCGArgConstraint *ct,
break;
case 'q':
/* A register that can be used as a byte operand. */
ct->regs = TCG_TARGET_REG_BITS == 64 ? 0xffff : 0xf;
ct->regs |= ALL_BYTEL_REGS;
break;
case 'Q':
/* A register with an addressable second byte (e.g. %ah). */
ct->regs = 0xf;
ct->regs |= ALL_BYTEH_REGS;
break;
case 'r':
/* A general register. */
@ -247,19 +255,11 @@ static const char *target_parse_constraint(TCGArgConstraint *ct,
case 'L':
/* qemu_ld/st data+address constraint */
ct->regs = TCG_TARGET_REG_BITS == 64 ? 0xffff : 0xff;
#ifdef CONFIG_SOFTMMU
tcg_regset_reset_reg(ct->regs, TCG_REG_L0);
tcg_regset_reset_reg(ct->regs, TCG_REG_L1);
#endif
ct->regs |= ALL_GENERAL_REGS & ~SOFTMMU_RESERVE_REGS;
break;
case 's':
/* qemu_st8_i32 data constraint */
ct->regs = 0xf;
#ifdef CONFIG_SOFTMMU
tcg_regset_reset_reg(ct->regs, TCG_REG_L0);
tcg_regset_reset_reg(ct->regs, TCG_REG_L1);
#endif
ct->regs |= ALL_BYTEL_REGS & ~SOFTMMU_RESERVE_REGS;
break;
case 'e':