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We can use TImode/OImode/XImode integers for piecewise move and store. 1. Define MAX_MOVE_MAX to 64, which is the constant maximum number of bytes that a single instruction can move quickly between memory and registers or between two memory locations. 2. Define MOVE_MAX to the maximum number of bytes we can move from memory to memory in one reasonably fast instruction. The difference between MAX_MOVE_MAX and MOVE_MAX is that MAX_MOVE_MAX must be a constant, independent of compiler options, since it is used in reload.h to define struct target_reload and MOVE_MAX can vary, depending on compiler options. 3. When vector register is used for piecewise move and store, we don't increase stack_alignment_needed since vector register spill isn't required for piecewise move and store. Since stack_realign_needed is set to true by checking stack_alignment_estimated set by pseudo vector register usage, we also need to check stack_realign_needed to eliminate frame pointer. gcc/ * config/i386/i386.c (ix86_finalize_stack_frame_flags): Also check stack_realign_needed for stack realignment. (ix86_legitimate_constant_p): Always allow CONST_WIDE_INT smaller than the largest integer supported by vector register. * config/i386/i386.h (MAX_MOVE_MAX): New. Set to 64. (MOVE_MAX): Set to bytes of the largest integer supported by vector register. (STORE_MAX_PIECES): New. gcc/testsuite/ * gcc.target/i386/pr90773-1.c: Adjust to expect movq for 32-bit. * gcc.target/i386/pr90773-4.c: Also run for 32-bit. * gcc.target/i386/pr90773-15.c: Likewise. * gcc.target/i386/pr90773-16.c: Likewise. * gcc.target/i386/pr90773-17.c: Likewise. * gcc.target/i386/pr90773-24.c: Likewise. * gcc.target/i386/pr90773-25.c: Likewise. * gcc.target/i386/pr100865-1.c: Likewise. * gcc.target/i386/pr100865-2.c: Likewise. * gcc.target/i386/pr100865-3.c: Likewise. * gcc.target/i386/pr90773-14.c: Also run for 32-bit and expect XMM movd to store 4 bytes. * gcc.target/i386/pr100865-4a.c: Also run for 32-bit and expect YMM registers. * gcc.target/i386/pr100865-4b.c: Likewise. * gcc.target/i386/pr100865-10a.c: Expect YMM registers. * gcc.target/i386/pr100865-10b.c: Likewise.
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