From: Richard Henderson <richard.henderson@linaro.org>
The unit operation for fmul8x16 and friends is described in the
manual as "MS16b". Split that out for clarity. Improve rounding
with an unconditional addition of 0.5 as a fixed-point integer.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240502165528.244004-8-richard.henderson@linaro.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
target/sparc/vis_helper.c | 78 ++++++++++++---------------------------
1 file changed, 24 insertions(+), 54 deletions(-)
diff --git a/target/sparc/vis_helper.c b/target/sparc/vis_helper.c
index 14c665cad6..e15c6bb34e 100644
--- a/target/sparc/vis_helper.c
+++ b/target/sparc/vis_helper.c
@@ -44,6 +44,7 @@ target_ulong helper_array8(target_ulong pixel_addr, target_ulong cubesize)
#if HOST_BIG_ENDIAN
#define VIS_B64(n) b[7 - (n)]
+#define VIS_SB64(n) sb[7 - (n)]
#define VIS_W64(n) w[3 - (n)]
#define VIS_SW64(n) sw[3 - (n)]
#define VIS_L64(n) l[1 - (n)]
@@ -51,6 +52,7 @@ target_ulong helper_array8(target_ulong pixel_addr, target_ulong cubesize)
#define VIS_W32(n) w[1 - (n)]
#else
#define VIS_B64(n) b[n]
+#define VIS_SB64(n) sb[n]
#define VIS_W64(n) w[n]
#define VIS_SW64(n) sw[n]
#define VIS_L64(n) l[n]
@@ -60,6 +62,7 @@ target_ulong helper_array8(target_ulong pixel_addr, target_ulong cubesize)
typedef union {
uint8_t b[8];
+ int8_t sb[8];
uint16_t w[4];
int16_t sw[4];
uint32_t l[2];
@@ -95,27 +98,23 @@ uint64_t helper_fpmerge(uint32_t src1, uint32_t src2)
return d.ll;
}
+static inline int do_ms16b(int x, int y)
+{
+ return ((x * y) + 0x80) >> 8;
+}
+
uint64_t helper_fmul8x16(uint32_t src1, uint64_t src2)
{
VIS64 d;
VIS32 s;
- uint32_t tmp;
s.l = src1;
d.ll = src2;
-#define PMUL(r) \
- tmp = (int32_t)d.VIS_SW64(r) * (int32_t)s.VIS_B32(r); \
- if ((tmp & 0xff) > 0x7f) { \
- tmp += 0x100; \
- } \
- d.VIS_W64(r) = tmp >> 8;
-
- PMUL(0);
- PMUL(1);
- PMUL(2);
- PMUL(3);
-#undef PMUL
+ d.VIS_W64(0) = do_ms16b(s.VIS_B32(0), d.VIS_SW64(0));
+ d.VIS_W64(1) = do_ms16b(s.VIS_B32(1), d.VIS_SW64(1));
+ d.VIS_W64(2) = do_ms16b(s.VIS_B32(2), d.VIS_SW64(2));
+ d.VIS_W64(3) = do_ms16b(s.VIS_B32(3), d.VIS_SW64(3));
return d.ll;
}
@@ -124,25 +123,14 @@ uint64_t helper_fmul8x16a(uint32_t src1, int32_t src2)
{
VIS32 s;
VIS64 d;
- uint32_t tmp;
s.l = src1;
d.ll = 0;
-#define PMUL(r) \
- do { \
- tmp = src2 * (int32_t)s.VIS_B32(r); \
- if ((tmp & 0xff) > 0x7f) { \
- tmp += 0x100; \
- } \
- d.VIS_W64(r) = tmp >> 8; \
- } while (0)
-
- PMUL(0);
- PMUL(1);
- PMUL(2);
- PMUL(3);
-#undef PMUL
+ d.VIS_W64(0) = do_ms16b(s.VIS_B32(0), src2);
+ d.VIS_W64(1) = do_ms16b(s.VIS_B32(1), src2);
+ d.VIS_W64(2) = do_ms16b(s.VIS_B32(2), src2);
+ d.VIS_W64(3) = do_ms16b(s.VIS_B32(3), src2);
return d.ll;
}
@@ -150,23 +138,14 @@ uint64_t helper_fmul8x16a(uint32_t src1, int32_t src2)
uint64_t helper_fmul8sux16(uint64_t src1, uint64_t src2)
{
VIS64 s, d;
- uint32_t tmp;
s.ll = src1;
d.ll = src2;
-#define PMUL(r) \
- tmp = (int32_t)d.VIS_SW64(r) * ((int32_t)s.VIS_SW64(r) >> 8); \
- if ((tmp & 0xff) > 0x7f) { \
- tmp += 0x100; \
- } \
- d.VIS_W64(r) = tmp >> 8;
-
- PMUL(0);
- PMUL(1);
- PMUL(2);
- PMUL(3);
-#undef PMUL
+ d.VIS_W64(0) = do_ms16b(s.VIS_SB64(1), d.VIS_SW64(0));
+ d.VIS_W64(1) = do_ms16b(s.VIS_SB64(3), d.VIS_SW64(1));
+ d.VIS_W64(2) = do_ms16b(s.VIS_SB64(5), d.VIS_SW64(2));
+ d.VIS_W64(3) = do_ms16b(s.VIS_SB64(7), d.VIS_SW64(3));
return d.ll;
}
@@ -174,23 +153,14 @@ uint64_t helper_fmul8sux16(uint64_t src1, uint64_t src2)
uint64_t helper_fmul8ulx16(uint64_t src1, uint64_t src2)
{
VIS64 s, d;
- uint32_t tmp;
s.ll = src1;
d.ll = src2;
-#define PMUL(r) \
- tmp = (int32_t)d.VIS_SW64(r) * ((uint32_t)s.VIS_B64(r * 2)); \
- if ((tmp & 0xff) > 0x7f) { \
- tmp += 0x100; \
- } \
- d.VIS_W64(r) = tmp >> 8;
-
- PMUL(0);
- PMUL(1);
- PMUL(2);
- PMUL(3);
-#undef PMUL
+ d.VIS_W64(0) = do_ms16b(s.VIS_B64(0), d.VIS_SW64(0));
+ d.VIS_W64(1) = do_ms16b(s.VIS_B64(2), d.VIS_SW64(1));
+ d.VIS_W64(2) = do_ms16b(s.VIS_B64(4), d.VIS_SW64(2));
+ d.VIS_W64(3) = do_ms16b(s.VIS_B64(6), d.VIS_SW64(3));
return d.ll;
}
--
2.39.2