https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92488
--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
So the following pattern added to dfp.md:
+(define_insn "trunctdsd2"
+ [(set (match_operand:SD 0 "gpc_reg_operand" "=d")
+ (float_truncate:SD (match_operand:TD 1 "gpc_reg_operand" "d")))
+ (clobber (match_scratch:TD 2 "=d"))
+ (clobber (match_scratch:DF 3 "=&d"))]
+ "TARGET_DFP"
+ "mffs %3\;mtfsfi 7,7,1\;drdpq %2,%1\;mtfsf 0xff,%3,1,0\;drsp %0,%2"
+ [(set_attr "type" "dfp")
+ (set_attr "length" "20")])
Gives me the following on Paul's test case:
truncd128:
.LFB0:
.cfi_startproc
mffs 0
mtfsfi 7,7,1
drdpq 12,2
mtfsf 0xff,0,1,0
drsp 1,12
blr
Does this look like what we want?
