diff options
Diffstat (limited to 'src/compiler/nir/nir_opcodes.py')
| -rw-r--r-- | src/compiler/nir/nir_opcodes.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py index 4bb21ea1358..e74e07b3144 100644 --- a/src/compiler/nir/nir_opcodes.py +++ b/src/compiler/nir/nir_opcodes.py @@ -1047,6 +1047,18 @@ dst.z = src2.x; dst.w = src3.x; """) +# An integer multiply instruction for address calculation. This is +# similar to imul, except that the results are undefined in case of +# overflow. Overflow is defined according to the size of the variable +# being dereferenced. +# +# This relaxed definition, compared to imul, allows an optimization +# pass to propagate bounds (ie, from an load/store intrinsic) to the +# sources, such that lower precision integer multiplies can be used. +# This is useful on hw that has 24b or perhaps 16b integer multiply +# instructions. +binop("amul", tint, _2src_commutative + associative, "src0 * src1") + # ir3-specific instruction that maps directly to mul-add shift high mix, # (IMADSH_MIX16 i.e. ah * bl << 16 + c). It is used for lowering integer # multiplication (imul) on Freedreno backend.. |