RISC-V: generate builtin macro for compilation with strict alignment

Distinguish between explicit -mstrict-align and cpu tune param
for slow_unaligned_access=true/false.

Tested for regressions using rv32/64 multilib with newlib/linux

gcc/ChangeLog:

	* config/riscv/riscv-c.cc (riscv_cpu_cpp_builtins): Generate
	__riscv_unaligned_avoid with value 1 or
	__riscv_unaligned_slow with value 1 or
	__riscv_unaligned_fast with value 1
	* config/riscv/riscv.cc (riscv_option_override): Define
	riscv_user_wants_strict_align. Set
	riscv_user_wants_strict_align to TARGET_STRICT_ALIGN
	* config/riscv/riscv.h: Declare riscv_user_wants_strict_align

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/attribute-1.c: Check for
	__riscv_unaligned_slow or __riscv_unaligned_fast
	* gcc.target/riscv/attribute-4.c: Check for
	__riscv_unaligned_avoid
	* gcc.target/riscv/attribute-5.c: Check for
	__riscv_unaligned_slow or __riscv_unaligned_fast
	* gcc.target/riscv/predef-align-1.c: New test.
	* gcc.target/riscv/predef-align-2.c: New test.
	* gcc.target/riscv/predef-align-3.c: New test.
	* gcc.target/riscv/predef-align-4.c: New test.
	* gcc.target/riscv/predef-align-5.c: New test.
	* gcc.target/riscv/predef-align-6.c: New test.

Reviewed-by: Jeff Law <jlaw@ventanamicro.com>
Signed-off-by: Edwin Lu <ewlu@rivosinc.com>
Co-authored-by: Vineet Gupta <vineetg@rivosinc.com>

0 files changed, 0 insertions, 0 deletions