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tcg/i386: Store out-of-range call targets in constant pool
Already it saves 2 bytes per call, but also the constant pool entry may well be shared across multiple calls. Signed-off-by: Richard Henderson <rth@twiddle.net>
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@ -189,5 +189,6 @@ static inline void tb_target_set_jmp_target(uintptr_t tc_ptr,
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#ifdef CONFIG_SOFTMMU
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#define TCG_TARGET_NEED_LDST_LABELS
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#endif
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#define TCG_TARGET_NEED_POOL_LABELS
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#endif
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@ -22,6 +22,8 @@
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* THE SOFTWARE.
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*/
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#include "tcg-pool.inc.c"
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#ifdef CONFIG_DEBUG_TCG
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static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
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#if TCG_TARGET_REG_BITS == 64
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@ -1180,9 +1182,14 @@ static void tcg_out_branch(TCGContext *s, int call, tcg_insn_unit *dest)
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tcg_out_opc(s, call ? OPC_CALL_Jz : OPC_JMP_long, 0, 0, 0);
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tcg_out32(s, disp);
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} else {
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tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R10, (uintptr_t)dest);
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tcg_out_modrm(s, OPC_GRP5,
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call ? EXT5_CALLN_Ev : EXT5_JMPN_Ev, TCG_REG_R10);
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/* rip-relative addressing into the constant pool.
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This is 6 + 8 = 14 bytes, as compared to using an
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an immediate load 10 + 6 = 16 bytes, plus we may
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be able to re-use the pool constant for more calls. */
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tcg_out_opc(s, OPC_GRP5, 0, 0, 0);
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tcg_out8(s, (call ? EXT5_CALLN_Ev : EXT5_JMPN_Ev) << 3 | 5);
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new_pool_label(s, (uintptr_t)dest, R_386_PC32, s->code_ptr, -4);
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tcg_out32(s, 0);
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}
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}
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@ -2595,6 +2602,11 @@ static void tcg_target_qemu_prologue(TCGContext *s)
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#endif
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}
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static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
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{
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memset(p, 0x90, count);
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}
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static void tcg_target_init(TCGContext *s)
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{
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#ifdef CONFIG_CPUID_H
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