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expmed: Fix possible use of NULL_RTX return value from emit_store_flag

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MSP430 does not support have any store-flag instructions, so
emit_store_flag can return NULL_RTX.  Catch the NULL_RTX in
expmed.c:expand_sdiv_pow2.

gcc/ChangeLog:

	* expmed.c (expand_sdiv_pow2): Check return value from emit_store_flag
	is not NULL_RTX before use.
This commit is contained in:
Jozef Lawrynowicz 2020-07-22 12:37:29 +01:00
parent 4821e0aabe
commit 259c3965b1
1 changed files with 21 additions and 14 deletions
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35
gcc/expmed.c
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@ -4086,9 +4086,12 @@ expand_sdiv_pow2 (scalar_int_mode mode, rtx op0, HOST_WIDE_INT d)
{
temp = gen_reg_rtx (mode);
temp = emit_store_flag (temp, LT, op0, const0_rtx, mode, 0, 1);
temp = expand_binop (mode, add_optab, temp, op0, NULL_RTX,
0, OPTAB_LIB_WIDEN);
return expand_shift (RSHIFT_EXPR, mode, temp, logd, NULL_RTX, 0);
if (temp != NULL_RTX)
{
temp = expand_binop (mode, add_optab, temp, op0, NULL_RTX,
0, OPTAB_LIB_WIDEN);
return expand_shift (RSHIFT_EXPR, mode, temp, logd, NULL_RTX, 0);
}
}
if (HAVE_conditional_move
@ -4122,17 +4125,21 @@ expand_sdiv_pow2 (scalar_int_mode mode, rtx op0, HOST_WIDE_INT d)
temp = gen_reg_rtx (mode);
temp = emit_store_flag (temp, LT, op0, const0_rtx, mode, 0, -1);
if (GET_MODE_BITSIZE (mode) >= BITS_PER_WORD
|| shift_cost (optimize_insn_for_speed_p (), mode, ushift)
> COSTS_N_INSNS (1))
temp = expand_binop (mode, and_optab, temp, gen_int_mode (d - 1, mode),
NULL_RTX, 0, OPTAB_LIB_WIDEN);
else
temp = expand_shift (RSHIFT_EXPR, mode, temp,
ushift, NULL_RTX, 1);
temp = expand_binop (mode, add_optab, temp, op0, NULL_RTX,
0, OPTAB_LIB_WIDEN);
return expand_shift (RSHIFT_EXPR, mode, temp, logd, NULL_RTX, 0);
if (temp != NULL_RTX)
{
if (GET_MODE_BITSIZE (mode) >= BITS_PER_WORD
|| shift_cost (optimize_insn_for_speed_p (), mode, ushift)
> COSTS_N_INSNS (1))
temp = expand_binop (mode, and_optab, temp,
gen_int_mode (d - 1, mode),
NULL_RTX, 0, OPTAB_LIB_WIDEN);
else
temp = expand_shift (RSHIFT_EXPR, mode, temp,
ushift, NULL_RTX, 1);
temp = expand_binop (mode, add_optab, temp, op0, NULL_RTX,
0, OPTAB_LIB_WIDEN);
return expand_shift (RSHIFT_EXPR, mode, temp, logd, NULL_RTX, 0);
}
}
label = gen_label_rtx ();