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After switching the s390 backend to store long doubles in vector registers, "f" constraint broke when used with the former: long doubles correspond to TFmode, which in combination with "f" corresponds to hard regs %v0-%v15, however, asm users expect a %f0-%f15 pair. Fix by using TARGET_MD_ASM_ADJUST hook to convert TFmode values to FPRX2mode and back. gcc/ChangeLog: 2020-12-14 Ilya Leoshkevich <iii@linux.ibm.com> * config/s390/s390.c (f_constraint_p): New function. (s390_md_asm_adjust): Implement TARGET_MD_ASM_ADJUST. (TARGET_MD_ASM_ADJUST): Likewise. gcc/testsuite/ChangeLog: 2020-12-14 Ilya Leoshkevich <iii@linux.ibm.com> * gcc.target/s390/vector/long-double-asm-commutative.c: New test. * gcc.target/s390/vector/long-double-asm-earlyclobber.c: New test. * gcc.target/s390/vector/long-double-asm-in-out.c: New test. * gcc.target/s390/vector/long-double-asm-inout.c: New test. * gcc.target/s390/vector/long-double-asm-matching.c: New test. * gcc.target/s390/vector/long-double-asm-regmem.c: New test. * gcc.target/s390/vector/long-double-volatile-from-i64.c: New test.
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