Adds necessary helper functions for mapping LLVM IR onto TCG.
Specifically, helpers corresponding to the bitreverse and funnel-shift
intrinsics in LLVM.
Note: these may be converted to more efficient implementations in the
future, but for the time being it allows helper-to-tcg to support a
wider subset of LLVM IR.
Signed-off-by: Anton Johansson <a...@rev.ng>
---
accel/tcg/tcg-runtime.c | 29 +++++++++++++++++++++++++++++
accel/tcg/tcg-runtime.h | 5 +++++
2 files changed, 34 insertions(+)
diff --git a/accel/tcg/tcg-runtime.c b/accel/tcg/tcg-runtime.c
index 9fa539ad3d..6372fa3f6f 100644
--- a/accel/tcg/tcg-runtime.c
+++ b/accel/tcg/tcg-runtime.c
@@ -23,6 +23,8 @@
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
+#include "qemu/int128.h"
+#include "qemu/bitops.h"
#include "cpu.h"
#include "exec/helper-proto-common.h"
#include "exec/cpu_ldst.h"
@@ -57,6 +59,21 @@ uint32_t HELPER(remu_i32)(uint32_t arg1, uint32_t arg2)
return arg1 % arg2;
}
+uint32_t HELPER(bitreverse8_i32)(uint32_t x)
+{
+ return revbit8((uint8_t) x);
+}
+
+uint32_t HELPER(bitreverse16_i32)(uint32_t x)
+{
+ return revbit16((uint16_t) x);
+}
+
+uint32_t HELPER(bitreverse32_i32)(uint32_t x)
+{
+ return revbit32(x);
+}
+
/* 64-bit helpers */
uint64_t HELPER(shl_i64)(uint64_t arg1, uint64_t arg2)
@@ -74,6 +91,13 @@ int64_t HELPER(sar_i64)(int64_t arg1, int64_t arg2)
return arg1 >> arg2;
}
+uint64_t HELPER(fshl_i64)(uint64_t a, uint64_t b, uint64_t c)
+{
+ Int128 d = int128_make128(b, a);
+ Int128 shift = int128_lshift(d, c);
+ return int128_gethi(shift);
+}
+
int64_t HELPER(div_i64)(int64_t arg1, int64_t arg2)
{
return arg1 / arg2;
@@ -94,6 +118,11 @@ uint64_t HELPER(remu_i64)(uint64_t arg1, uint64_t arg2)
return arg1 % arg2;
}
+uint64_t HELPER(bitreverse64_i64)(uint64_t x)
+{
+ return revbit64(x);
+}
+
uint64_t HELPER(muluh_i64)(uint64_t arg1, uint64_t arg2)
{
uint64_t l, h;
diff --git a/accel/tcg/tcg-runtime.h b/accel/tcg/tcg-runtime.h
index c23b5e66c4..0a4d31eb48 100644
--- a/accel/tcg/tcg-runtime.h
+++ b/accel/tcg/tcg-runtime.h
@@ -2,15 +2,20 @@ DEF_HELPER_FLAGS_2(div_i32, TCG_CALL_NO_RWG_SE, s32, s32, s32)
DEF_HELPER_FLAGS_2(rem_i32, TCG_CALL_NO_RWG_SE, s32, s32, s32)
DEF_HELPER_FLAGS_2(divu_i32, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_FLAGS_2(remu_i32, TCG_CALL_NO_RWG_SE, i32, i32, i32)
+DEF_HELPER_FLAGS_1(bitreverse8_i32, TCG_CALL_NO_RWG_SE, i32, i32)
+DEF_HELPER_FLAGS_1(bitreverse16_i32, TCG_CALL_NO_RWG_SE, i32, i32)
+DEF_HELPER_FLAGS_1(bitreverse32_i32, TCG_CALL_NO_RWG_SE, i32, i32)
DEF_HELPER_FLAGS_2(div_i64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
DEF_HELPER_FLAGS_2(rem_i64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
DEF_HELPER_FLAGS_2(divu_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(remu_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_1(bitreverse64_i64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_2(shl_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(shr_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(sar_i64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
+DEF_HELPER_FLAGS_3(fshl_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)
DEF_HELPER_FLAGS_2(mulsh_i64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
DEF_HELPER_FLAGS_2(muluh_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
--
2.45.2
