If we have any case where both operands can fit in 16b, a plain old mul with no
mach should be sufficient.
Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 30b4e67..7c43280 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1662,6 +1662,11 @@ fs_visitor::emit_mul_dw(fs_reg dst, fs_reg src0, fs_reg
src1,
if (brw->gen >= 8) {
emit(MUL(dst, src0, src1));
return;
+ } else if ((src0_u16 && src1_u16)) {
+ fs_reg s0 = fs_reg(retype(src0, BRW_REGISTER_TYPE_UW));
+ fs_reg s1 = fs_reg(retype(src0, BRW_REGISTER_TYPE_UW));
+ emit(MUL(dst, s0, s1));
+ return;
}
/* For integer multiplication, the MUL uses the low 16 bits of one of the
--
2.2.1
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