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re PR rtl-optimization/81553 (ICE in immed_wide_int_const, at emit-rtl.c:607)

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PR rtl-optimization/81553
	* combine.c (simplify_if_then_else): In (if_then_else COND (OP Z C1) Z)
	to (OP Z (mult COND (C1 * STORE_FLAG_VALUE))) optimization, if OP
	is a shift where C1 has different mode than the whole shift, use C1's
	mode for MULT rather than the shift's mode.

	* gcc.c-torture/compile/pr81553.c: New test.

From-SVN: r255150
This commit is contained in:
Jakub Jelinek 2017-11-25 20:35:47 +01:00 • committed by Jakub Jelinek
parent 5a2707633b
commit e95be6330d
4 changed files with 28 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,5 +1,11 @@
2017-11-25 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/81553
* combine.c (simplify_if_then_else): In (if_then_else COND (OP Z C1) Z)
to (OP Z (mult COND (C1 * STORE_FLAG_VALUE))) optimization, if OP
is a shift where C1 has different mode than the whole shift, use C1's
mode for MULT rather than the shift's mode.
PR target/82848
* config/rs6000/rs6000.c (rs6000_gimple_fold_builtin): Don't fold
builtins not enabled in the currently selected ISA.

10
gcc/combine.c
View file

@ -6639,11 +6639,15 @@ simplify_if_then_else (rtx x)
if (z)
{
temp = subst (simplify_gen_relational (true_code, m, VOIDmode,
machine_mode cm = m;
if ((op == ASHIFT || op == LSHIFTRT || op == ASHIFTRT)
&& GET_MODE (c1) != VOIDmode)
cm = GET_MODE (c1);
temp = subst (simplify_gen_relational (true_code, cm, VOIDmode,
cond_op0, cond_op1),
pc_rtx, pc_rtx, 0, 0, 0);
temp = simplify_gen_binary (MULT, m, temp,
simplify_gen_binary (MULT, m, c1,
temp = simplify_gen_binary (MULT, cm, temp,
simplify_gen_binary (MULT, cm, c1,
const_true_rtx));
temp = subst (temp, pc_rtx, pc_rtx, 0, 0, 0);
temp = simplify_gen_binary (op, m, gen_lowpart (m, z), temp);

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2017-11-25 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/81553
* gcc.c-torture/compile/pr81553.c: New test.
2017-11-25 Andreas Schwab <schwab@linux-m68k.org>
* g++.dg/abi/structret1.C (FrameworkObject::action): Return a

10
gcc/testsuite/gcc.c-torture/compile/pr81553.c Normal file
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@ -0,0 +1,10 @@
/* PR rtl-optimization/81553 */
int a, b, c, d;
void
foo (void)
{
d = 1 >> c >> 1;
b = ~(209883449764912897ULL & d) << (0 >= a) | ~d;
}