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tcg/aarch64: Build vector immediates with two insns
Use MOVI+ORR or MVNI+BIC in order to build some vector constants, as opposed to dropping them to the constant pool. This includes all 16-bit constants and a similar set of 32-bit constants. Backports commit 02f3a5b4744885258758d07ebe09cf965de78bcf from qemu
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@ -273,6 +273,26 @@ static bool is_fimm64(uint64_t v64, int *cmode, int *imm8)
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return false;
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}
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/*
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* Return non-zero if v32 can be formed by MOVI+ORR.
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* Place the parameters for MOVI in (cmode, imm8).
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* Return the cmode for ORR; the imm8 can be had via extraction from v32.
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*/
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static int is_shimm32_pair(uint32_t v32, int *cmode, int *imm8)
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{
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int i;
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for (i = 6; i > 0; i -= 2) {
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/* Mask out one byte we can add with ORR. */
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uint32_t tmp = v32 & ~(0xffu << (i * 4));
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if (is_shimm32(tmp, cmode, imm8) ||
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is_soimm32(tmp, cmode, imm8)) {
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break;
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}
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}
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return i;
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}
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static int tcg_target_const_match(tcg_target_long val, TCGType type,
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const TCGArgConstraint *arg_ct)
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{
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@ -492,6 +512,8 @@ typedef enum {
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/* AdvSIMD modified immediate */
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I3606_MOVI = 0x0f000400,
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I3606_MVNI = 0x2f000400,
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I3606_BIC = 0x2f001400,
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I3606_ORR = 0x0f001400,
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/* AdvSIMD shift by immediate */
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I3614_SSHR = 0x0f000400,
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@ -840,6 +862,14 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
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tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
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return;
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}
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/*
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* Otherwise, all remaining constants can be loaded in two insns:
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* rd = v16 & 0xff, rd |= v16 & 0xff00.
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*/
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tcg_out_insn(s, 3606, MOVI, q, rd, 0, 0x8, v16 & 0xff);
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tcg_out_insn(s, 3606, ORR, q, rd, 0, 0xa, v16 >> 8);
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return;
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} else if (v64 == dup_const(MO_32, v64)) {
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uint32_t v32 = v64;
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uint32_t n32 = ~v32;
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@ -855,6 +885,23 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
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tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
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return;
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}
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/*
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* Restrict the set of constants to those we can load with
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* two instructions. Others we load from the pool.
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*/
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i = is_shimm32_pair(v32, &cmode, &imm8);
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if (i) {
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tcg_out_insn(s, 3606, MOVI, q, rd, 0, cmode, imm8);
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tcg_out_insn(s, 3606, ORR, q, rd, 0, i, extract32(v32, i * 4, 8));
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return;
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}
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i = is_shimm32_pair(n32, &cmode, &imm8);
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if (i) {
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tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
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tcg_out_insn(s, 3606, BIC, q, rd, 0, i, extract32(n32, i * 4, 8));
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return;
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}
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} else if (is_fimm64(v64, &cmode, &imm8)) {
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tcg_out_insn(s, 3606, MOVI, q, rd, 1, cmode, imm8);
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return;
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