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[Qemu-devel] [PATCH 22/25] tcg: Add helpers for clrsb
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 22/25] tcg: Add helpers for clrsb |
Date: |
Wed, 16 Nov 2016 20:25:32 +0100 |
The number of actual invocations does not warrent an opcode,
and the backends generating it. But at least we can eliminate
redundant helpers.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg-runtime.c | 10 ++++++++++
tcg/tcg-op.c | 28 ++++++++++++++++++++++++++++
tcg/tcg-op.h | 4 ++++
tcg/tcg-runtime.h | 2 ++
4 files changed, 44 insertions(+)
diff --git a/tcg-runtime.c b/tcg-runtime.c
index eb3bade..c8b98df 100644
--- a/tcg-runtime.c
+++ b/tcg-runtime.c
@@ -121,6 +121,16 @@ uint64_t HELPER(ctz_i64)(uint64_t arg, uint64_t zero_val)
return arg ? ctz64(arg) : zero_val;
}
+uint32_t HELPER(clrsb_i32)(uint32_t arg)
+{
+ return clrsb32(arg);
+}
+
+uint64_t HELPER(clrsb_i64)(uint64_t arg)
+{
+ return clrsb64(arg);
+}
+
void HELPER(exit_atomic)(CPUArchState *env)
{
cpu_loop_exit_atomic(ENV_GET_CPU(env), GETPC());
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index b45095c..728c4b3 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -489,6 +489,20 @@ void tcg_gen_ctzi_i32(TCGv_i32 ret, TCGv_i32 arg1,
uint32_t arg2)
tcg_temp_free_i32(t);
}
+void tcg_gen_clrsb_i32(TCGv_i32 ret, TCGv_i32 arg)
+{
+ if (TCG_TARGET_HAS_clz_i32) {
+ TCGv_i32 t = tcg_temp_new_i32();
+ tcg_gen_sari_i32(t, arg, 31);
+ tcg_gen_xor_i32(t, t, arg);
+ tcg_gen_clzi_i32(t, t, 32);
+ tcg_gen_subi_i32(ret, t, 1);
+ tcg_temp_free_i32(t);
+ } else {
+ gen_helper_clrsb_i32(ret, arg);
+ }
+}
+
void tcg_gen_rotl_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2)
{
if (TCG_TARGET_HAS_rot_i32) {
@@ -1789,6 +1803,20 @@ void tcg_gen_ctzi_i64(TCGv_i64 ret, TCGv_i64 arg1,
uint64_t arg2)
}
}
+void tcg_gen_clrsb_i64(TCGv_i64 ret, TCGv_i64 arg)
+{
+ if (TCG_TARGET_HAS_clz_i64 || TCG_TARGET_HAS_clz_i32) {
+ TCGv_i64 t = tcg_temp_new_i64();
+ tcg_gen_sari_i64(t, arg, 63);
+ tcg_gen_xor_i64(t, t, arg);
+ tcg_gen_clzi_i64(t, t, 64);
+ tcg_gen_subi_i64(ret, t, 1);
+ tcg_temp_free_i64(t);
+ } else {
+ gen_helper_clrsb_i64(ret, arg);
+ }
+}
+
void tcg_gen_rotl_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2)
{
if (TCG_TARGET_HAS_rot_i64) {
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index 7a24e84..c2f3db9 100644
--- a/tcg/tcg-op.h
+++ b/tcg/tcg-op.h
@@ -290,6 +290,7 @@ void tcg_gen_clz_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32
arg2);
void tcg_gen_ctz_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2);
void tcg_gen_clzi_i32(TCGv_i32 ret, TCGv_i32 arg1, uint32_t arg2);
void tcg_gen_ctzi_i32(TCGv_i32 ret, TCGv_i32 arg1, uint32_t arg2);
+void tcg_gen_clrsb_i32(TCGv_i32 ret, TCGv_i32 arg);
void tcg_gen_rotl_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2);
void tcg_gen_rotli_i32(TCGv_i32 ret, TCGv_i32 arg1, unsigned arg2);
void tcg_gen_rotr_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2);
@@ -477,6 +478,7 @@ void tcg_gen_clz_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64
arg2);
void tcg_gen_ctz_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2);
void tcg_gen_clzi_i64(TCGv_i64 ret, TCGv_i64 arg1, uint64_t arg2);
void tcg_gen_ctzi_i64(TCGv_i64 ret, TCGv_i64 arg1, uint64_t arg2);
+void tcg_gen_clrsb_i64(TCGv_i64 ret, TCGv_i64 arg);
void tcg_gen_rotl_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2);
void tcg_gen_rotli_i64(TCGv_i64 ret, TCGv_i64 arg1, unsigned arg2);
void tcg_gen_rotr_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2);
@@ -970,6 +972,7 @@ void tcg_gen_atomic_xor_fetch_i64(TCGv_i64, TCGv, TCGv_i64,
TCGArg, TCGMemOp);
#define tcg_gen_ctz_tl tcg_gen_ctz_i64
#define tcg_gen_clzi_tl tcg_gen_clzi_i64
#define tcg_gen_ctzi_tl tcg_gen_ctzi_i64
+#define tcg_gen_clrsb_tl tcg_gen_clrsb_i64
#define tcg_gen_rotl_tl tcg_gen_rotl_i64
#define tcg_gen_rotli_tl tcg_gen_rotli_i64
#define tcg_gen_rotr_tl tcg_gen_rotr_i64
@@ -1065,6 +1068,7 @@ void tcg_gen_atomic_xor_fetch_i64(TCGv_i64, TCGv,
TCGv_i64, TCGArg, TCGMemOp);
#define tcg_gen_ctz_tl tcg_gen_ctz_i32
#define tcg_gen_clzi_tl tcg_gen_clzi_i32
#define tcg_gen_ctzi_tl tcg_gen_ctzi_i32
+#define tcg_gen_clrsb_tl tcg_gen_clrsb_i32
#define tcg_gen_rotl_tl tcg_gen_rotl_i32
#define tcg_gen_rotli_tl tcg_gen_rotli_i32
#define tcg_gen_rotr_tl tcg_gen_rotr_i32
diff --git a/tcg/tcg-runtime.h b/tcg/tcg-runtime.h
index eb1cd76..0d30f1a 100644
--- a/tcg/tcg-runtime.h
+++ b/tcg/tcg-runtime.h
@@ -19,6 +19,8 @@ DEF_HELPER_FLAGS_2(clz_i32, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_FLAGS_2(ctz_i32, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_FLAGS_2(clz_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(ctz_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_1(clrsb_i32, TCG_CALL_NO_RWG_SE, i32, i32)
+DEF_HELPER_FLAGS_1(clrsb_i64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(exit_atomic, TCG_CALL_NO_WG, noreturn, env)
--
2.7.4
- [Qemu-devel] [PATCH 14/25] target-i386: Use clz and ctz opcodes, (continued)
- [Qemu-devel] [PATCH 14/25] target-i386: Use clz and ctz opcodes, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 15/25] disas/i386.c: Handle tzcnt, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 17/25] tcg/ppc: Handle ctz and clz opcodes, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 18/25] tcg/aarch64: Handle ctz and clz opcodes, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 16/25] tcg/i386: Handle ctz and clz opcodes, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 19/25] tcg/arm: Handle ctz and clz opcodes, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 20/25] tcg/mips: Handle clz opcode, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 23/25] target-arm: Use clrsb helper, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 21/25] tcg/s390: Handle clz opcode, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 22/25] tcg: Add helpers for clrsb,
Richard Henderson <=
- [Qemu-devel] [PATCH 24/25] target-tricore: Use clrsb helper, Richard Henderson, 2016/11/16
- [Qemu-devel] [PATCH 25/25] target-xtensa: Use clrsb helper, Richard Henderson, 2016/11/16