Ping.
On Wed, Oct 25, 2023 at 11:27:33AM +0200, Stefan Schulze Frielinghaus wrote: > Currently for an unsigned 16-bit comparison between memory and an > immediate where the high bit is set, a clc is emitted. This is because > the constant is created for mode HI and therefore sign extended. This > means constraint D does not hold anymore. Since the mode already > restricts the immediate to 16 bit, it is enough to make use of > constraint n and chop of the high bits in the output template. > > Bootstrapped and regtested on s390. Ok for mainline? > > gcc/ChangeLog: > > * config/s390/s390.md (*cmphi_ccu): For immediate operand 1 make > use of constraint n instead of D and chop of high bits in the > output template. > --- > gcc/config/s390/s390.md | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md > index 3f29ba21442..777a20f8e77 100644 > --- a/gcc/config/s390/s390.md > +++ b/gcc/config/s390/s390.md > @@ -1355,13 +1355,13 @@ > (define_insn "*cmphi_ccu" > [(set (reg CC_REGNUM) > (compare (match_operand:HI 0 "nonimmediate_operand" "d,d,Q,Q,BQ") > - (match_operand:HI 1 "general_operand" "Q,S,D,BQ,Q")))] > + (match_operand:HI 1 "general_operand" "Q,S,n,BQ,Q")))] > "s390_match_ccmode (insn, CCUmode) > && !register_operand (operands[1], HImode)" > "@ > clm\t%0,3,%S1 > clmy\t%0,3,%S1 > - clhhsi\t%0,%1 > + clhhsi\t%0,%x1 > # > #" > [(set_attr "op_type" "RS,RSY,SIL,SS,SS") > -- > 2.41.0 >
