Patchwork [07/15] tcg-sparc: Steamline qemu_ld/st more.

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Submitter Richard Henderson
Date March 25, 2012, 10:27 p.m.
Message ID <1332714477-30079-8-git-send-email-rth@twiddle.net>
Download mbox | patch
Permalink /patch/148597/
State New
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Richard Henderson - March 25, 2012, 10:27 p.m.
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/sparc/tcg-target.c |  235 +++++++++++++++++++++++++----------------------
 1 files changed, 125 insertions(+), 110 deletions(-)

Patch

diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c
index 9891648..d45114f 100644
--- a/tcg/sparc/tcg-target.c
+++ b/tcg/sparc/tcg-target.c
@@ -761,22 +761,16 @@  static const void * const qemu_st_helpers[4] = {
    WHICH is the offset into the CPUTLBEntry structure of the slot to read.
    This should be offsetof addr_read or addr_write.
 
-   Outputs:
-   LABEL_PTRS is filled with the position of the forward jumps to the
-   TLB miss case.  This will always be a ,PN insn, so a 19-bit offset.
-
-   Returns a register loaded with the low part of the address, adjusted
-   as indicated by the TLB and so is a host address.  Undefined in the
-   TLB miss case.  */
+   The result of the TLB comparison is in %[ix]cc.  The sanitized address
+   is in the returned register, maybe %o0.  The TLB addend is in %o1.  */
 
 static int tcg_out_tlb_load(TCGContext *s, int addrlo_idx, int mem_index,
-                            int s_bits, const TCGArg *args,
-                            uint32_t **label_ptr, int which)
+                            int s_bits, const TCGArg *args, int which)
 {
     const int addrlo = args[addrlo_idx];
-    const int r0 = tcg_target_call_iarg_regs[0];
-    const int r1 = tcg_target_call_iarg_regs[1];
-    const int r2 = tcg_target_call_iarg_regs[2];
+    const int r0 = TCG_REG_O0;
+    const int r1 = TCG_REG_O1;
+    const int r2 = TCG_REG_O2;
     int addr = addrlo;
     int tlb_ofs;
 
@@ -807,60 +801,39 @@  static int tcg_out_tlb_load(TCGContext *s, int addrlo_idx, int mem_index,
         tlb_ofs = 0;
     }
 
-    /* ld [arg1 + which], arg2 */
+    /* Load the tlb comparator and the addend.  */
     tcg_out_ld(s, TCG_TYPE_TL, r2, r1, tlb_ofs + which);
+    tcg_out_ld(s, TCG_TYPE_PTR, r1, r1, tlb_ofs+offsetof(CPUTLBEntry, addend));
 
     /* subcc arg0, arg2, %g0 */
     tcg_out_cmp(s, r0, r2, 0);
 
-    /* bne,pn %[ix]cc, label0 */
-    *label_ptr = (uint32_t *)s->code_ptr;
-    tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_NE, 0) | INSN_OP2(0x1) |
-                  ((TARGET_LONG_BITS == 64) << 21)));
-
-    /* TLB Hit.  Compute the host address into r1.  The ld is in the
-       branch delay slot; harmless for the TLB miss case.  */
-    tcg_out_ld(s, TCG_TYPE_PTR, r1, r1, tlb_ofs+offsetof(CPUTLBEntry, addend));
-
+    /* If the guest address must be zero-extended, do so now.  */
     if (TCG_TARGET_REG_BITS == 64 && TARGET_LONG_BITS == 32) {
         tcg_out_arithi(s, r0, addrlo, 0, SHIFT_SRL);
-        tcg_out_arith(s, r1, r0, r1, ARITH_ADD);
-    } else {
-        tcg_out_arith(s, r1, addrlo, r1, ARITH_ADD);
+        return r0;
     }
-
-    return r1;
+    return addrlo;
 }
 #endif /* CONFIG_SOFTMMU */
 
-static void tcg_out_qemu_ld_direct(TCGContext *s, int addr, int addend,
-                                   int datalo, int datahi, int sizeop)
-{
+static const int qemu_ld_opc[8] = {
 #ifdef TARGET_WORDS_BIGENDIAN
-    static const int ld_opc[8] = {
-        LDUB, LDUH, LDUW, LDX, LDSB, LDSH, LDSW, LDX
-    };
+    LDUB, LDUH, LDUW, LDX, LDSB, LDSH, LDSW, LDX
 #else
-    static const int ld_opc[8] = {
-        LDUB, LDUH_LE, LDUW_LE, LDX_LE, LDSB, LDSH_LE, LDSW_LE, LDX_LE
-    };
+    LDUB, LDUH_LE, LDUW_LE, LDX_LE, LDSB, LDSH_LE, LDSW_LE, LDX_LE
 #endif
+};
 
-    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
-        /* Load all 64-bits into an O/G register.  */
-        int reg64 = (datalo < 16 ? datalo : TCG_REG_O0);
-        tcg_out_ldst_rr(s, reg64, addr, addend, ld_opc[sizeop]);
-        /* Move the two 32-bit pieces into the destination registers.  */
-        tcg_out_arithi(s, datahi, reg64, 32, SHIFT_SRLX);
-        if (reg64 != datalo) {
-            tcg_out_mov(s, TCG_TYPE_I32, datalo, reg64);
-        }
-    } else {
-        tcg_out_ldst_rr(s, datalo, addr, addend, ld_opc[sizeop]);
-    }
-}
+static const int qemu_st_opc[4] = {
+#ifdef TARGET_WORDS_BIGENDIAN
+    STB, STH, STW, STX
+#else
+    STB, STH_LE, STW_LE, STX_LE
+#endif
+};
 
-static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
+static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int sizeop)
 {
     int addrlo_idx = 1, datalo, datahi, addr_reg;
 #if defined(CONFIG_SOFTMMU)
@@ -869,7 +842,7 @@  static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
 #endif
 
     datahi = datalo = args[0];
-    if (TCG_TARGET_REG_BITS == 32 && opc == 3) {
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
         datahi = args[1];
         addrlo_idx = 2;
     }
@@ -877,27 +850,59 @@  static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
 #if defined(CONFIG_SOFTMMU)
     memi_idx = addrlo_idx + 1 + (TARGET_LONG_BITS > TCG_TARGET_REG_BITS);
     memi = args[memi_idx];
-    s_bits = opc & 3;
+    s_bits = sizeop & 3;
 
     addr_reg = tcg_out_tlb_load(s, addrlo_idx, memi, s_bits, args,
-                                label_ptr, offsetof(CPUTLBEntry, addr_read));
+                                offsetof(CPUTLBEntry, addr_read));
 
-    /* TLB Hit.  */
-    tcg_out_qemu_ld_direct(s, addr_reg, TCG_REG_G0, datalo, datahi, opc);
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
+        int reg64;
 
-    /* b,pt,n label1 */
-    label_ptr[1] = (uint32_t *)s->code_ptr;
-    tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_A, 0) | INSN_OP2(0x1)
-                  | (1 << 29) | (1 << 19)));
+        /* bne,pn %[xi]cc, label0 */
+        label_ptr[0] = (uint32_t *)s->code_ptr;
+        tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_NE, 0) | INSN_OP2(0x1)
+                      | ((TARGET_LONG_BITS == 64) << 21)));
+
+        /* TLB Hit.  */
+        /* Load all 64-bits into an O/G register.  */
+        reg64 = (datalo < 16 ? datalo : TCG_REG_O0);
+        tcg_out_ldst_rr(s, reg64, addr_reg, TCG_REG_O1, qemu_ld_opc[sizeop]);
+
+        /* Move the two 32-bit pieces into the destination registers.  */
+        tcg_out_arithi(s, datahi, reg64, 32, SHIFT_SRLX);
+        if (reg64 != datalo) {
+            tcg_out_mov(s, TCG_TYPE_I32, datalo, reg64);
+        }
+
+        /* b,pt,n label1 */
+        label_ptr[1] = (uint32_t *)s->code_ptr;
+        tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_A, 0) | INSN_OP2(0x1)
+                      | (1 << 29) | (1 << 19)));
+    } else {
+        /* The fast path is exactly one insn.  Thus we can perform the
+           entire TLB Hit in the (annulled) delay slot of the branch
+           over the TLB Miss case.  */
+
+        /* beq,a,pt %[xi]cc, label0 */
+        label_ptr[0] = NULL;
+        label_ptr[1] = (uint32_t *)s->code_ptr;
+        tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_E, 0) | INSN_OP2(0x1)
+                      | ((TARGET_LONG_BITS == 64) << 21)
+                      | (1 << 29) | (1 << 19)));
+        /* delay slot */
+        tcg_out_ldst_rr(s, datalo, addr_reg, TCG_REG_O1, qemu_ld_opc[sizeop]);
+    }
 
     /* TLB Miss.  */
 
-    *label_ptr[0] |= INSN_OFF19((unsigned long)s->code_ptr -
-                                (unsigned long)label_ptr[0]);
-    n = 0;
-#ifdef CONFIG_TCG_PASS_AREG0
-    tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[n++], TCG_AREG0);
-#endif
+    if (label_ptr[0]) {
+        *label_ptr[0] |= INSN_OFF19((unsigned long)s->code_ptr -
+                                    (unsigned long)label_ptr[0]);
+    }
+    n = ARG_OFFSET;
+    if (ARG_OFFSET) {
+       tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
+    }
     if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
         tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[n++],
                     args[addrlo_idx + 1]);
@@ -925,7 +930,7 @@  static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
 
     n = tcg_target_call_oarg_regs[0];
     /* datalo = sign_extend(arg0) */
-    switch(opc) {
+    switch (sizeop) {
     case 0 | 4:
         /* Recall that SRA sign extends from bit 31 through bit 63.  */
         tcg_out_arithi(s, datalo, n, 24, SHIFT_SLL);
@@ -962,40 +967,35 @@  static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
         tcg_out_arithi(s, TCG_REG_I5, addr_reg, 0, SHIFT_SRL);
         addr_reg = TCG_REG_I5;
     }
-    tcg_out_qemu_ld_direct(s, addr_reg,
-                           (GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_G0),
-                           datalo, datahi, opc);
-#endif /* CONFIG_SOFTMMU */
-}
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
+        int reg64 = (datalo < 16 ? datalo : TCG_REG_O0);
 
-static void tcg_out_qemu_st_direct(TCGContext *s, int addr, int addend,
-                                   int datalo, int datahi, int sizeop)
-{
-#ifdef TARGET_WORDS_BIGENDIAN
-    static const int st_opc[4] = { STB, STH, STW, STX };
-#else
-    static const int st_opc[4] = { STB, STH_LE, STW_LE, STX_LE };
-#endif
+        tcg_out_ldst_rr(s, reg64, addr_reg,
+                        (GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_G0),
+                        qemu_ld_opc[sizeop]);
 
-    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
-        tcg_out_arithi(s, TCG_REG_O0, datalo, 0, SHIFT_SRL);
-        tcg_out_arithi(s, TCG_REG_O2, datahi, 32, SHIFT_SLLX);
-        tcg_out_arith(s, TCG_REG_O0, TCG_REG_O0, TCG_REG_O2, ARITH_OR);
-        datalo = TCG_REG_O0;
+        tcg_out_arithi(s, datahi, reg64, 32, SHIFT_SRLX);
+        if (reg64 != datalo) {
+            tcg_out_mov(s, TCG_TYPE_I32, datalo, reg64);
+        }
+    } else {
+        tcg_out_ldst_rr(s, datalo, addr_reg,
+                        (GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_G0),
+                        qemu_ld_opc[sizeop]);
     }
-    tcg_out_ldst_rr(s, datalo, addr, addend, st_opc[sizeop]);
+#endif /* CONFIG_SOFTMMU */
 }
 
-static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
+static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int sizeop)
 {
     int addrlo_idx = 1, datalo, datahi, addr_reg;
 #if defined(CONFIG_SOFTMMU)
     int memi_idx, memi, n;
-    uint32_t *label_ptr[2];
+    uint32_t *label_ptr;
 #endif
 
     datahi = datalo = args[0];
-    if (TCG_TARGET_REG_BITS == 32 && opc == 3) {
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
         datahi = args[1];
         addrlo_idx = 2;
     }
@@ -1004,33 +1004,40 @@  static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
     memi_idx = addrlo_idx + 1 + (TARGET_LONG_BITS > TCG_TARGET_REG_BITS);
     memi = args[memi_idx];
 
-    addr_reg = tcg_out_tlb_load(s, addrlo_idx, memi, opc, args,
-                                label_ptr, offsetof(CPUTLBEntry, addr_write));
+    addr_reg = tcg_out_tlb_load(s, addrlo_idx, memi, sizeop, args,
+                                offsetof(CPUTLBEntry, addr_write));
 
-    /* TLB Hit.  */
-    tcg_out_qemu_st_direct(s, addr_reg, TCG_REG_G0, datalo, datahi, opc);
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
+        /* Reconstruct the full 64-bit value in %g1, using %o2 as temp.  */
+        /* ??? Redefine the temps from %i4/%i5 so that we have a o/g temp. */
+        tcg_out_arithi(s, TCG_REG_G1, datalo, 0, SHIFT_SRL);
+        tcg_out_arithi(s, TCG_REG_O2, datahi, 32, SHIFT_SLLX);
+        tcg_out_arith(s, TCG_REG_G1, TCG_REG_G1, TCG_REG_O2, ARITH_OR);
+        datalo = TCG_REG_G1;
+    }
 
-    /* b,pt,n label1 */
-    label_ptr[1] = (uint32_t *)s->code_ptr;
-    tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_A, 0) | INSN_OP2(0x1)
+    /* The fast path is exactly one insn.  Thus we can perform the entire
+       TLB Hit in the (annulled) delay slot of the branch over TLB Miss.  */
+    /* beq,a,pt %[xi]cc, label0 */
+    label_ptr = (uint32_t *)s->code_ptr;
+    tcg_out32(s, (INSN_OP(0) | INSN_COND(COND_E, 0) | INSN_OP2(0x1)
+                  | ((TARGET_LONG_BITS == 64) << 21)
                   | (1 << 29) | (1 << 19)));
+    /* delay slot */
+    tcg_out_ldst_rr(s, datalo, addr_reg, TCG_REG_O1, qemu_st_opc[sizeop]);
 
     /* TLB Miss.  */
-
-    *label_ptr[0] |= INSN_OFF19((unsigned long)s->code_ptr -
-                                (unsigned long)label_ptr[0]);
-
-    n = 0;
-#ifdef CONFIG_TCG_PASS_AREG0
-    tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[n++], TCG_AREG0);
-#endif
+    n = ARG_OFFSET;
+    if (ARG_OFFSET) {
+         tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
+    }
     if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
         tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[n++],
                     args[addrlo_idx + 1]);
     }
     tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[n++],
                 args[addrlo_idx]);
-    if (TCG_TARGET_REG_BITS == 32 && opc == 3) {
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
         tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[n++], datahi);
     }
     tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[n++], datalo);
@@ -1042,7 +1049,7 @@  static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
                sizeof(long));
 
     /* qemu_st_helper[s_bits](arg0, arg1, arg2) */
-    tcg_out32(s, CALL | ((((tcg_target_ulong)qemu_st_helpers[opc]
+    tcg_out32(s, CALL | ((((tcg_target_ulong)qemu_st_helpers[sizeop]
                            - (tcg_target_ulong)s->code_ptr) >> 2)
                          & 0x3fffffff));
     /* delay slot */
@@ -1053,17 +1060,25 @@  static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
                TCG_TARGET_CALL_STACK_OFFSET - TCG_STATIC_CALL_ARGS_SIZE -
                sizeof(long));
 
-    *label_ptr[1] |= INSN_OFF19((unsigned long)s->code_ptr -
-                                (unsigned long)label_ptr[1]);
+    *label_ptr |= INSN_OFF19((unsigned long)s->code_ptr -
+                             (unsigned long)label_ptr);
 #else
     addr_reg = args[addrlo_idx];
     if (TCG_TARGET_REG_BITS == 64 && TARGET_LONG_BITS == 32) {
         tcg_out_arithi(s, TCG_REG_I5, addr_reg, 0, SHIFT_SRL);
         addr_reg = TCG_REG_I5;
     }
-    tcg_out_qemu_st_direct(s, addr_reg,
-                           (GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_G0),
-                           datalo, datahi, opc);
+    if (TCG_TARGET_REG_BITS == 32 && sizeop == 3) {
+        /* Reconstruct the full 64-bit value in %g1, using %o2 as temp.  */
+        /* ??? Redefine the temps from %i4/%i5 so that we have a o/g temp. */
+        tcg_out_arithi(s, TCG_REG_G1, datalo, 0, SHIFT_SRL);
+        tcg_out_arithi(s, TCG_REG_O2, datahi, 32, SHIFT_SLLX);
+        tcg_out_arith(s, TCG_REG_G1, TCG_REG_G1, TCG_REG_O2, ARITH_OR);
+        datalo = TCG_REG_G1;
+    }
+    tcg_out_ldst_rr(s, datalo, addr_reg,
+                    (GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_G0),
+                    qemu_st_opc[sizeop]);
 #endif /* CONFIG_SOFTMMU */
 }