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[Qemu-devel] [PATCH v2 1/2] ARM: add neon helpers for VQSHLU
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v2 1/2] ARM: add neon helpers for VQSHLU |
Date: |
Sat, 8 Jan 2011 16:01:15 +0000 |
From: Juha Riihimäki <address@hidden>
Add neon helper functions to implement VQSHLU, which is a
signed-to-unsigned version of VQSHL available only as an
immediate form.
Signed-off-by: Juha Riihimäki <address@hidden>
Reviewed-by: Aurelien Jarno <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/helpers.h | 4 +++
target-arm/neon_helper.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/target-arm/helpers.h b/target-arm/helpers.h
index 0d1bc47..b88ebae 100644
--- a/target-arm/helpers.h
+++ b/target-arm/helpers.h
@@ -249,6 +249,10 @@ DEF_HELPER_3(neon_qshl_u32, i32, env, i32, i32)
DEF_HELPER_3(neon_qshl_s32, i32, env, i32, i32)
DEF_HELPER_3(neon_qshl_u64, i64, env, i64, i64)
DEF_HELPER_3(neon_qshl_s64, i64, env, i64, i64)
+DEF_HELPER_3(neon_qshlu_s8, i32, env, i32, i32);
+DEF_HELPER_3(neon_qshlu_s16, i32, env, i32, i32);
+DEF_HELPER_3(neon_qshlu_s32, i32, env, i32, i32);
+DEF_HELPER_3(neon_qshlu_s64, i64, env, i64, i64);
DEF_HELPER_3(neon_qrshl_u8, i32, env, i32, i32)
DEF_HELPER_3(neon_qrshl_s8, i32, env, i32, i32)
DEF_HELPER_3(neon_qrshl_u16, i32, env, i32, i32)
diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c
index dae063e..20f3c16 100644
--- a/target-arm/neon_helper.c
+++ b/target-arm/neon_helper.c
@@ -632,6 +632,53 @@ uint64_t HELPER(neon_qshl_s64)(CPUState *env, uint64_t
valop, uint64_t shiftop)
return val;
}
+#define NEON_FN(dest, src1, src2) do { \
+ if (src1 & (1 << (sizeof(src1) * 8 - 1))) { \
+ SET_QC(); \
+ dest = 0; \
+ } else { \
+ int8_t tmp; \
+ tmp = (int8_t)src2; \
+ if (tmp >= (ssize_t)sizeof(src1) * 8) { \
+ if (src1) { \
+ SET_QC(); \
+ dest = ~0; \
+ } else { \
+ dest = 0; \
+ } \
+ } else if (tmp <= -(ssize_t)sizeof(src1) * 8) { \
+ dest = 0; \
+ } else if (tmp < 0) { \
+ dest = src1 >> -tmp; \
+ } else { \
+ dest = src1 << tmp; \
+ if ((dest >> tmp) != src1) { \
+ SET_QC(); \
+ dest = ~0; \
+ } \
+ } \
+ }} while (0)
+NEON_VOP_ENV(qshlu_s8, neon_u8, 4)
+NEON_VOP_ENV(qshlu_s16, neon_u16, 2)
+#undef NEON_FN
+
+uint32_t HELPER(neon_qshlu_s32)(CPUState *env, uint32_t valop, uint32_t
shiftop)
+{
+ if ((int32_t)valop < 0) {
+ SET_QC();
+ return 0;
+ }
+ return helper_neon_qshl_u32(env, valop, shiftop);
+}
+
+uint64_t HELPER(neon_qshlu_s64)(CPUState *env, uint64_t valop, uint64_t
shiftop)
+{
+ if ((int64_t)valop < 0) {
+ SET_QC();
+ return 0;
+ }
+ return helper_neon_qshl_u64(env, valop, shiftop);
+}
/* FIXME: This is wrong. */
#define NEON_FN(dest, src1, src2) do { \
--
1.6.3.3