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authorRichard Henderson <richard.henderson@linaro.org>2021-08-05 01:15:53 +0300
committerRichard Henderson <richard.henderson@linaro.org>2021-09-21 19:36:44 -0700
commit220b2da7f34c29412db0dc0182e36fce67c8a9e4 (patch)
tree89c2925e8abf247838a03f71d388249a3b503d45 /tcg
parent897fd616fdb1347b903c81f101f03eb6e6474246 (diff)
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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.inc21
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);
}