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d9ec27c1c3
Check the output operand for representing pushing a value onto the stack rather than the constant 0 input in determining whether to use the PUSHL or the CLRL instruction for a SImode move. The latter actually works by means of using the predecrement addressing mode with the SP register and the machine code produced even takes the same number of bytes, however at least with some VAX implementations it incurs a performance penalty. Besides, we don't want to check the wrong operand anyway and have code that works by chance only. Add a test case covering push operations; for operands different from constant zero there is actually a code size advantage for using PUSHL rather than the equivalent MOVL instruction. gcc/ * config/vax/vax.c (vax_output_int_move): Check the correct operand for constant 0 push operation. gcc/testsuite/ * gcc.target/vax/push.c: New test. |
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