From 9c53889ba3b7bda8c8e7dcee253e0a54fc4288f9 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Tue, 2 Sep 2014 13:59:47 -0700 Subject: [PATCH] tcg-aarch64: Use 32-bit loads for qemu_ld_i32 The "old" qemu_ld opcode did not specify the size of the result, and so we had to assume full register width. With the new opcodes, we can narrow the result. Signed-off-by: Richard Henderson --- tcg/aarch64/tcg-target.c | 27 +++++++++++++++------------ tcg/tcg-be-ldst.h | 5 +++-- 2 files changed, 18 insertions(+), 14 deletions(-) diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c index 56dae66a3f..987c0bd4db 100644 --- a/tcg/aarch64/tcg-target.c +++ b/tcg/aarch64/tcg-target.c @@ -1007,7 +1007,7 @@ static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb) tcg_out_adr(s, TCG_REG_X3, lb->raddr); tcg_out_call(s, qemu_ld_helpers[opc & ~MO_SIGN]); if (opc & MO_SIGN) { - tcg_out_sxt(s, TCG_TYPE_I64, size, lb->datalo_reg, TCG_REG_X0); + tcg_out_sxt(s, lb->type, size, lb->datalo_reg, TCG_REG_X0); } else { tcg_out_mov(s, size == MO_64, lb->datalo_reg, TCG_REG_X0); } @@ -1032,7 +1032,7 @@ static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb) } static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOp opc, - TCGReg data_reg, TCGReg addr_reg, + TCGType ext, TCGReg data_reg, TCGReg addr_reg, int mem_index, tcg_insn_unit *raddr, tcg_insn_unit *label_ptr) { @@ -1040,6 +1040,7 @@ static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOp opc, label->is_ld = is_ld; label->opc = opc; + label->type = ext; label->datalo_reg = data_reg; label->addrlo_reg = addr_reg; label->mem_index = mem_index; @@ -1108,7 +1109,7 @@ static void tcg_out_tlb_read(TCGContext *s, TCGReg addr_reg, TCGMemOp s_bits, #endif /* CONFIG_SOFTMMU */ -static void tcg_out_qemu_ld_direct(TCGContext *s, TCGMemOp memop, +static void tcg_out_qemu_ld_direct(TCGContext *s, TCGMemOp memop, TCGType ext, TCGReg data_r, TCGReg addr_r, TCGReg off_r) { const TCGMemOp bswap = memop & MO_BSWAP; @@ -1118,7 +1119,8 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGMemOp memop, tcg_out_ldst_r(s, I3312_LDRB, data_r, addr_r, off_r); break; case MO_SB: - tcg_out_ldst_r(s, I3312_LDRSBX, data_r, addr_r, off_r); + tcg_out_ldst_r(s, ext ? I3312_LDRSBX : I3312_LDRSBW, + data_r, addr_r, off_r); break; case MO_UW: tcg_out_ldst_r(s, I3312_LDRH, data_r, addr_r, off_r); @@ -1130,9 +1132,10 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGMemOp memop, if (bswap) { tcg_out_ldst_r(s, I3312_LDRH, data_r, addr_r, off_r); tcg_out_rev16(s, data_r, data_r); - tcg_out_sxt(s, TCG_TYPE_I64, MO_16, data_r, data_r); + tcg_out_sxt(s, ext, MO_16, data_r, data_r); } else { - tcg_out_ldst_r(s, I3312_LDRSHX, data_r, addr_r, off_r); + tcg_out_ldst_r(s, ext ? I3312_LDRSHX : I3312_LDRSHW, + data_r, addr_r, off_r); } break; case MO_UL: @@ -1197,18 +1200,18 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGMemOp memop, } static void tcg_out_qemu_ld(TCGContext *s, TCGReg data_reg, TCGReg addr_reg, - TCGMemOp memop, int mem_index) + TCGMemOp memop, TCGType ext, int mem_index) { #ifdef CONFIG_SOFTMMU TCGMemOp s_bits = memop & MO_SIZE; tcg_insn_unit *label_ptr; tcg_out_tlb_read(s, addr_reg, s_bits, &label_ptr, mem_index, 1); - tcg_out_qemu_ld_direct(s, memop, data_reg, addr_reg, TCG_REG_X1); - add_qemu_ldst_label(s, true, memop, data_reg, addr_reg, + tcg_out_qemu_ld_direct(s, memop, ext, data_reg, addr_reg, TCG_REG_X1); + add_qemu_ldst_label(s, true, memop, ext, data_reg, addr_reg, mem_index, s->code_ptr, label_ptr); #else /* !CONFIG_SOFTMMU */ - tcg_out_qemu_ld_direct(s, memop, data_reg, addr_reg, + tcg_out_qemu_ld_direct(s, memop, ext, data_reg, addr_reg, GUEST_BASE ? TCG_REG_GUEST_BASE : TCG_REG_XZR); #endif /* CONFIG_SOFTMMU */ } @@ -1222,7 +1225,7 @@ static void tcg_out_qemu_st(TCGContext *s, TCGReg data_reg, TCGReg addr_reg, tcg_out_tlb_read(s, addr_reg, s_bits, &label_ptr, mem_index, 0); tcg_out_qemu_st_direct(s, memop, data_reg, addr_reg, TCG_REG_X1); - add_qemu_ldst_label(s, false, memop, data_reg, addr_reg, + add_qemu_ldst_label(s, false, memop, s_bits == MO_64, data_reg, addr_reg, mem_index, s->code_ptr, label_ptr); #else /* !CONFIG_SOFTMMU */ tcg_out_qemu_st_direct(s, memop, data_reg, addr_reg, @@ -1515,7 +1518,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, case INDEX_op_qemu_ld_i32: case INDEX_op_qemu_ld_i64: - tcg_out_qemu_ld(s, a0, a1, a2, args[3]); + tcg_out_qemu_ld(s, a0, a1, a2, ext, args[3]); break; case INDEX_op_qemu_st_i32: case INDEX_op_qemu_st_i64: diff --git a/tcg/tcg-be-ldst.h b/tcg/tcg-be-ldst.h index 49b3de61ea..429cba24d4 100644 --- a/tcg/tcg-be-ldst.h +++ b/tcg/tcg-be-ldst.h @@ -24,8 +24,9 @@ #define TCG_MAX_QEMU_LDST 640 typedef struct TCGLabelQemuLdst { - bool is_ld:1; /* qemu_ld: true, qemu_st: false */ - TCGMemOp opc:4; + bool is_ld; /* qemu_ld: true, qemu_st: false */ + TCGMemOp opc; + TCGType type; /* result type of a load */ TCGReg addrlo_reg; /* reg index for low word of guest virtual addr */ TCGReg addrhi_reg; /* reg index for high word of guest virtual addr */ TCGReg datalo_reg; /* reg index for low word to be loaded or stored */