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[Qemu-devel] [RFC v2 09/13] target-ppc: add cmpeqb instruction
From: |
Nikunj A Dadhania |
Subject: |
[Qemu-devel] [RFC v2 09/13] target-ppc: add cmpeqb instruction |
Date: |
Sat, 23 Jul 2016 14:14:46 +0530 |
Search a byte in the stream of 8bytes provided in the register
Suggested-by: Richard Henderson <address@hidden>
Signed-off-by: Nikunj A Dadhania <address@hidden>
---
target-ppc/helper.h | 1 +
target-ppc/int_helper.c | 22 ++++++++++++++++++++++
target-ppc/translate.c | 12 ++++++++++++
3 files changed, 35 insertions(+)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 3b3dc36..bd6f8f1 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -46,6 +46,7 @@ DEF_HELPER_FLAGS_2(modsw, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_FLAGS_2(moduw, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_3(sraw, tl, env, tl, tl)
#if defined(TARGET_PPC64)
+DEF_HELPER_FLAGS_2(cmpeqb, TCG_CALL_NO_RWG_SE, i32, tl, tl)
DEF_HELPER_FLAGS_2(modsd, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(modud, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_1(cntlzd, TCG_CALL_NO_RWG_SE, tl, tl)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index ac47230..280603f 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -166,6 +166,28 @@ target_ulong helper_cnttzw(target_ulong t)
}
#if defined(TARGET_PPC64)
+/* if x = 0xab, returns 0xababababababababa */
+#define pattern(x) (((x) & 0xff) * (~(target_ulong)0 / 0xff))
+
+/* substract 1 from each byte, and with inverse, check if MSB is set at each
+ * byte.
+ * i.e. ((0x00 - 0x01) & ~(0x00)) & 0x80
+ * (0xFF & 0xFF) & 0x80 = 0x80 (zero found)
+ */
+#define haszero(v) (((v) - pattern(0x01)) & ~(v) & pattern(0x80))
+
+/* When you XOR the pattern and there is a match, that byte will be zero */
+#define hasvalue(x, n) (haszero((x) ^ pattern(n)))
+
+uint32_t helper_cmpeqb(target_ulong ra, target_ulong rb)
+{
+ return hasvalue(rb, ra) ? 1 << CRF_GT : 0;
+}
+
+#undef pattern
+#undef haszero
+#undef hasvalue
+
uint64_t helper_modsd(uint64_t rau, uint64_t rbu)
{
int64_t ra = (int64_t)rau;
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index c28ddff..0d999d4 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -854,6 +854,15 @@ static void gen_cmprb(DisasContext *ctx)
tcg_temp_free_i32(src2hi);
}
+#if defined(TARGET_PPC64)
+/* cmpeqb */
+static void gen_cmpeqb(DisasContext *ctx)
+{
+ gen_helper_cmpeqb(cpu_crf[crfD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
+ cpu_gpr[rB(ctx->opcode)]);
+}
+#endif
+
/* isel (PowerPC 2.03 specification) */
static void gen_isel(DisasContext *ctx)
{
@@ -9982,6 +9991,9 @@ GEN_HANDLER(cmp, 0x1F, 0x00, 0x00, 0x00400000,
PPC_INTEGER),
GEN_HANDLER(cmpi, 0x0B, 0xFF, 0xFF, 0x00400000, PPC_INTEGER),
GEN_HANDLER(cmpl, 0x1F, 0x00, 0x01, 0x00400000, PPC_INTEGER),
GEN_HANDLER(cmpli, 0x0A, 0xFF, 0xFF, 0x00400000, PPC_INTEGER),
+#if defined(TARGET_PPC64)
+GEN_HANDLER_E(cmpeqb, 0x1F, 0x00, 0x07, 0x00600000, PPC_NONE, PPC2_ISA300),
+#endif
GEN_HANDLER_E(cmpb, 0x1F, 0x1C, 0x0F, 0x00000001, PPC_NONE, PPC2_ISA205),
GEN_HANDLER_E(cmprb, 0x1F, 0x00, 0x06, 0x00400001, PPC_NONE, PPC2_ISA300),
GEN_HANDLER(isel, 0x1F, 0x0F, 0xFF, 0x00000001, PPC_ISEL),
--
2.7.4
- [Qemu-devel] [RFC v2 00/13] POWER9 TCG enablements - part1, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 01/13] target-ppc: Introduce Power9 family, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 02/13] target-ppc: Introduce POWER ISA 3.0 flag, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 03/13] target-ppc: adding addpcis instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 04/13] target-ppc: add cmprb instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 05/13] target-ppc: add modulo word operations, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 06/13] target-ppc: add modulo dword operations, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 09/13] target-ppc: add cmpeqb instruction,
Nikunj A Dadhania <=
- [Qemu-devel] [RFC v2 07/13] target-ppc: add cnttzd[.] instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 10/13] target-ppc: add setb instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 08/13] target-ppc: add cnttzw[.] instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 11/13] target-ppc: add maddld instruction, Nikunj A Dadhania, 2016/07/23
- [Qemu-devel] [RFC v2 12/13] target-ppc: add maddhd and maddhdu instruction, Nikunj A Dadhania, 2016/07/23