2008-10-29 Jakub Jelinek PR middle-end/37870 * expmed.c (extract_bit_field_1): If int_mode_for_mode returns BLKmode for non-memory, convert using a wider MODE_INT mode or through memory. * gcc.target/i386/pr37870.c: New test. --- gcc/expmed.c (revision 141429) +++ gcc/expmed.c (revision 141430) @@ -1278,9 +1278,8 @@ extract_bit_field_1 (rtx str_rtx, unsign { if (MEM_P (op0)) op0 = adjust_address (op0, imode, 0); - else + else if (imode != BLKmode) { - gcc_assert (imode != BLKmode); op0 = gen_lowpart (imode, op0); /* If we got a SUBREG, force it into a register since we @@ -1288,6 +1287,24 @@ extract_bit_field_1 (rtx str_rtx, unsign if (GET_CODE (op0) == SUBREG) op0 = force_reg (imode, op0); } + else if (REG_P (op0)) + { + rtx reg, subreg; + imode = smallest_mode_for_size (GET_MODE_BITSIZE (GET_MODE (op0)), + MODE_INT); + reg = gen_reg_rtx (imode); + subreg = gen_lowpart_SUBREG (GET_MODE (op0), reg); + emit_move_insn (subreg, op0); + op0 = reg; + bitnum += SUBREG_BYTE (subreg) * BITS_PER_UNIT; + } + else + { + rtx mem = assign_stack_temp (GET_MODE (op0), + GET_MODE_SIZE (GET_MODE (op0)), 0); + emit_move_insn (mem, op0); + op0 = adjust_address (mem, BLKmode, 0); + } } } --- gcc/testsuite/gcc.target/i386/pr37870.c (revision 0) +++ gcc/testsuite/gcc.target/i386/pr37870.c (revision 141430) @@ -0,0 +1,29 @@ +/* PR middle-end/37870 */ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +unsigned int +foo (long double x) +{ + struct { char a[8]; unsigned int b:7; } c; + __builtin_memcpy (&c, &x, sizeof (c)); + return c.b; +} + +unsigned int +bar (long double x) +{ + union { struct { char a[8]; unsigned int b:7; } c; long double d; } u; + u.d = x; + return u.c.b; +} + +int +main (void) +{ + if (foo (1.245L) != bar (1.245L) + || foo (245.67L) != bar (245.67L) + || foo (0.00567L) != bar (0.00567L)) + __builtin_abort (); + return 0; +}