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tcg/ppc: Replace HAVE_ISEL macro with a variable 

Previously we've been hard-coding knowledge that Power7 has ISEL, but
it was an optional instruction before that.  Use the AT_HWCAP2 bit,
when present, to properly determine support.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-30 03:06:47 +00:00
parent 4e33fe0137
commit 63922f467a
1 changed files with 12 additions and 5 deletions
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17
tcg/ppc/tcg-target.inc.c
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@ -65,8 +65,7 @@
static tcg_insn_unit *tb_ret_addr;
TCGPowerISA have_isa;
#define HAVE_ISEL have_isa_2_06
static bool have_isel;
#ifndef CONFIG_SOFTMMU
#define TCG_GUEST_BASE_REG 30
@ -1100,7 +1099,7 @@ static void tcg_out_setcond(TCGContext *s, TCGType type, TCGCond cond,
/* If we have ISEL, we can implement everything with 3 or 4 insns.
All other cases below are also at least 3 insns, so speed up the
code generator by not considering them and always using ISEL. */
if (HAVE_ISEL) {
if (have_isel) {
int isel, tab;
tcg_out_cmp(s, cond, arg1, arg2, const_arg2, 7, type);
@ -1203,7 +1202,7 @@ static void tcg_out_movcond(TCGContext *s, TCGType type, TCGCond cond,
tcg_out_cmp(s, cond, c1, c2, const_c2, 7, type);
if (HAVE_ISEL) {
if (have_isel) {
int isel = tcg_to_isel[cond];
/* Swap the V operands if the operation indicates inversion. */
@ -1247,7 +1246,7 @@ static void tcg_out_cntxz(TCGContext *s, TCGType type, uint32_t opc,
} else {
tcg_out_cmp(s, TCG_COND_EQ, a1, 0, 1, 7, type);
/* Note that the only other valid constant for a2 is 0. */
if (HAVE_ISEL) {
if (have_isel) {
tcg_out32(s, opc | RA(TCG_REG_R0) | RS(a1));
tcg_out32(s, tcg_to_isel[TCG_COND_EQ] | TAB(a0, a2, TCG_REG_R0));
} else if (!const_a2 && a0 == a2) {
@ -2795,6 +2794,14 @@ static void tcg_target_init(TCGContext *s)
}
#endif
#ifdef PPC_FEATURE2_HAS_ISEL
/* Prefer explicit instruction from the kernel. */
have_isel = (hwcap2 & PPC_FEATURE2_HAS_ISEL) != 0;
#else
/* Fall back to knowing Power7 (2.06) has ISEL. */
have_isel = have_isa_2_06;
#endif
tcg_target_available_regs[TCG_TYPE_I32] = 0xffffffff;
tcg_target_available_regs[TCG_TYPE_I64] = 0xffffffff;