diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 7bd7a776b11..b04c2f363ef 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -1248,11 +1248,11 @@ dst.p = src15.x;
 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
+# (IMADSH_MIX16 i.e. al * bh << 16 + c). It is used for lowering integer
 # multiplication (imul) on Freedreno backend..
 opcode("imadsh_mix16", 0, tint32,
        [0, 0, 0], [tint32, tint32, tint32], False, "", """
-dst = ((((src0 & 0xffff0000) >> 16) * (src1 & 0x0000ffff)) << 16) + src2;
+dst = ((((src0 & 0x0000ffff) << 16) * (src1 & 0xffff0000)) >> 16) + src2;
 """)
 
 # ir3-specific instruction that maps directly to ir3 mad.s24.
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 20e3836ff58..6446c4915b7 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -2751,7 +2751,7 @@ for op in ['fddx', 'fddx_fine', 'fddx_coarse',
 optimizations += [
    # 'al * bl': If either 'al' or 'bl' is zero, return zero.
    (('umul_low', '#a(is_lower_half_zero)', 'b'), (0)),
-   # '(ah * bl) << 16 + c': If either 'ah' or 'bl' is zero, return 'c'.
+   # '(al * bh) << 16 + c': If either 'al' or 'bh' is zero, return 'c'.
    (('imadsh_mix16', '#a@32(is_lower_half_zero)', 'b@32', 'c@32'), ('c')),
    (('imadsh_mix16', 'a@32', '#b@32(is_upper_half_zero)', 'c@32'), ('c')),
 ]