gcc/testsuite/gcc.target/avr/uint8-single-reg.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Os" } */
   3
   4 /* This testcase verifies that a uint8_t variable assigned from a wider variable
   5    with the same range is held in a single register. VRP must not fold away the
   6    conversion and use two regs to hold the uint16_t - widenings are ok only upto
   7    word mode (1 byte for AVR).
   8 */
   9
  10 unsigned int foo(const unsigned int wvalue)
  11 {
  12   const unsigned char type = (wvalue >> 8);
  13   unsigned int size = 0;
  14
  15   if (type == 1)
  16   {
  17     size = 20;
  18   }
  19   return size;
  20 }
  21
  22 /* { dg-final { scan-assembler "cpi r25,lo8\\(1\\)" } } */
  23 /* { dg-final { scan-assembler-not "cpc r\\d+,__zero_reg__" } } */
  24