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| author | Richard Henderson <richard.henderson@linaro.org> | 2021-08-05 01:15:53 +0300 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-09-21 19:36:44 -0700 |
| commit | 220b2da7f34c29412db0dc0182e36fce67c8a9e4 (patch) | |
| tree | 89c2925e8abf247838a03f71d388249a3b503d45 /tcg | |
| parent | 897fd616fdb1347b903c81f101f03eb6e6474246 (diff) | |
| download | qemu-220b2da7f34c29412db0dc0182e36fce67c8a9e4.zip qemu-220b2da7f34c29412db0dc0182e36fce67c8a9e4.tar.gz qemu-220b2da7f34c29412db0dc0182e36fce67c8a9e4.tar.bz2 | |
tcg/sparc: Introduce tcg_out_mov_delay
This version of tcg_out_mov is emits a nop to fill the
delay slot if the move is not required.
The only current use, for INDEX_op_goto_ptr, will always
require the move but properly documents the delay slot.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/sparc/tcg-target.c.inc | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/tcg/sparc/tcg-target.c.inc b/tcg/sparc/tcg-target.c.inc index 1763253..9720d76 100644 --- a/tcg/sparc/tcg-target.c.inc +++ b/tcg/sparc/tcg-target.c.inc @@ -362,6 +362,11 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct) } } +static void tcg_out_nop(TCGContext *s) +{ + tcg_out32(s, NOP); +} + static void tcg_out_arith(TCGContext *s, TCGReg rd, TCGReg rs1, TCGReg rs2, int op) { @@ -389,6 +394,15 @@ static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg) return true; } +static void tcg_out_mov_delay(TCGContext *s, TCGReg ret, TCGReg arg) +{ + if (ret != arg) { + tcg_out_arith(s, ret, arg, TCG_REG_G0, ARITH_OR); + } else { + tcg_out_nop(s); + } +} + static void tcg_out_sethi(TCGContext *s, TCGReg ret, uint32_t arg) { tcg_out32(s, SETHI | INSN_RD(ret) | ((arg & 0xfffffc00) >> 10)); @@ -551,11 +565,6 @@ static void tcg_out_div32(TCGContext *s, TCGReg rd, TCGReg rs1, uns ? ARITH_UDIV : ARITH_SDIV); } -static void tcg_out_nop(TCGContext *s) -{ - tcg_out32(s, NOP); -} - static const uint8_t tcg_cond_to_bcond[] = { [TCG_COND_EQ] = COND_E, [TCG_COND_NE] = COND_NE, @@ -1349,7 +1358,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, case INDEX_op_goto_ptr: tcg_out_arithi(s, TCG_REG_G0, a0, 0, JMPL); if (USE_REG_TB) { - tcg_out_arith(s, TCG_REG_TB, a0, TCG_REG_G0, ARITH_OR); + tcg_out_mov_delay(s, TCG_REG_TB, a0); } else { tcg_out_nop(s); } |