2017-04-20 Uros Bizjak <ubiz...@gmail.com> PR target/79804 * config/i386/i386.c (print_reg): Remove assert for disalowed regno values, call output_operand_lossage instead.
testsuite/ChangeLog: 2017-04-20 Uros Bizjak <ubiz...@gmail.com> PR target/79804 * gcc.target/i386/pr79804.c: New test. Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}. Committed to mainline SVN. Uros.
Index: config/i386/i386.c =================================================================== --- config/i386/i386.c (revision 246382) +++ config/i386/i386.c (working copy) @@ -17637,13 +17637,17 @@ print_reg (rtx x, int code, FILE *file) regno = REGNO (x); - gcc_assert (regno != ARG_POINTER_REGNUM - && regno != FRAME_POINTER_REGNUM - && regno != FPSR_REG - && regno != FPCR_REG); - - if (regno == FLAGS_REG) + if (regno == ARG_POINTER_REGNUM + || regno == FRAME_POINTER_REGNUM + || regno == FPSR_REG + || regno == FPCR_REG) { + output_operand_lossage + ("invalid use of register '%s'", reg_names[regno]); + return; + } + else if (regno == FLAGS_REG) + { output_operand_lossage ("invalid use of asm flag output"); return; } Index: testsuite/gcc.target/i386/pr79804.c =================================================================== --- testsuite/gcc.target/i386/pr79804.c (nonexistent) +++ testsuite/gcc.target/i386/pr79804.c (working copy) @@ -0,0 +1,10 @@ +/* PR target/79804 */ +/* { dg-do compile } */ +/* { dg-options "" } */ + +void foo (void) +{ + register int r20 asm ("20"); + + asm volatile ("# %0" : "=r"(r20)); /* { dg-error "invalid use of register" } */ +}