https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101260
--- Comment #7 from Stefan Schulze Frielinghaus <stefansf at linux dot ibm.com> --- I had a look at the optimized tree output which looks good to me. However, I see that split2 transforms (insn 218 222 114 15 (set (reg/v:TI 10 %r10 [orig:87 a ] [87]) (reg/v:TI 18 %f4 [orig:87 a ] [87])) 1466 {movti} (nil)) into (insn 234 222 235 15 (set (reg:DI 10 %r10 [ a ]) (reg:DI 18 %f4)) 1467 {*movdi_64} (nil)) (insn 235 234 114 15 (set (reg:DI 11 %r11 [orig:87 a+8 ] [87]) (unspec:DI [ (reg:V2DI 18 %f4) (const_int 1 [0x1]) ] UNSPEC_VEC_EXTRACT)) 495 {*vec_extractv2di} (nil)) which might be wrong. If I swap r10 by r11 via diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md index 7faf775fbf2..0319934062a 100644 --- a/gcc/config/s390/s390.md +++ b/gcc/config/s390/s390.md @@ -1747,8 +1747,8 @@ (set (match_dup 3) (unspec:DI [(match_dup 5) (const_int 1)] UNSPEC_VEC_EXTRACT))] { - operands[2] = operand_subword (operands[0], 0, 0, TImode); - operands[3] = operand_subword (operands[0], 1, 0, TImode); + operands[2] = operand_subword (operands[0], 1, 0, TImode); + operands[3] = operand_subword (operands[0], 0, 0, TImode); operands[4] = gen_rtx_REG (DImode, REGNO (operands[1])); operands[5] = gen_rtx_REG (V2DImode, REGNO (operands[1])); }) then the compiled program just runs fine. However, I'm not sure whether this fixes the problem or just the symptoms. I will come back to this tomorrow.