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Due to a stupid mistake that I can't really explain, I'd got the treatment of p12-p15 mixed up when adding support for the SVE PCS. The registers are supposed to be call-preserved rather than call-clobbered. The fix is simple, but it has quite a big effect on the PCS tests (as it should!). 2020-03-18 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/aarch64.c (aarch64_sve_abi): Treat p12-p15 as call-preserved for SVE PCS functions. (aarch64_layout_frame): Cope with up to 12 predicate save slots. Optimize the case in which there are no following vector save slots. gcc/testsuite/ * gcc.target/aarch64/sve/acle/general/cpy_1.c: Leave gaps for in the check-function-bodies patterns for p15 to be saved. * gcc.target/aarch64/sve/pcs/args_1.c (callee_pred): Expect two predicates to be saved. * gcc.target/aarch64/sve/pcs/saves_1_be_nowrap.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/saves_1_be_wrap.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/saves_1_le_nowrap.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/saves_1_le_wrap.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/saves_2_be_nowrap.c: Expect p12-p15 to be saved and restored. * gcc.target/aarch64/sve/pcs/saves_2_be_wrap.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_2_le_nowrap.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_2_le_wrap.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_4_be.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_4_le.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_5_be.c: Likewise. * gcc.target/aarch64/sve/pcs/saves_5_le.c: Likewise. * gcc.target/aarch64/sve/pcs/stack_clash_1.c (test_1): Likewise. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/stack_clash_1_128.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. * gcc.target/aarch64/sve/pcs/stack_clash_1_256.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. (test_4): Expect only 16 bytes of stack to be allocated for the predicate save slot. * gcc.target/aarch64/sve/pcs/stack_clash_1_512.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. (test_4): Expect only 16 bytes of stack to be allocated for the predicate save slot. * gcc.target/aarch64/sve/pcs/stack_clash_1_1024.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. (test_4): Expect only 16 bytes of stack to be allocated for the predicate save slot. * gcc.target/aarch64/sve/pcs/stack_clash_1_2048.c (test_1): Expect p12-p15 to be saved and restored. (test_2): Remove p12-p15 from the clobber list. (test_4): Expect only 32 bytes of stack to be allocated for the predicate save slot. * gcc.target/aarch64/sve/pcs/stack_clash_2_256.c: Use z16 rather than p4 to create a vector-sized save slot. * gcc.target/aarch64/sve/pcs/stack_clash_2_512.c: Likewise. * gcc.target/aarch64/sve/pcs/stack_clash_2_1024.c: Likewise. * gcc.target/aarch64/sve/pcs/stack_clash_2_2048.c: Likewise.
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