* [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374]
@ 2022-04-26 7:24 Jakub Jelinek
2022-04-26 7:51 ` Richard Biener
2022-04-26 7:59 ` Christophe Lyon
0 siblings, 2 replies; 3+ messages in thread
From: Jakub Jelinek @ 2022-04-26 7:24 UTC (permalink / raw)
To: Richard Biener; +Cc: gcc-patches, Christophe Lyon
Hi!
As mentioned in the PR, we ICE because maybe_fold_*_comparisons returns
an expression with V4SImode type and we try to fold_convert it to
V4BImode, which isn't allowed.
IMHO no matter whether we change maybe_fold_*_comparisons we should
play safe on the reassoc side and punt if we can't convert like
we punt for many other reasons. This fixes the testcase on ARM.
Bootstrapped/regtested on {x86_64,i686,armv7hl,aarch64,powerpc64le}-linux,
ok for trunk?
Testcase not included, not exactly sure where and what directives it
should have in gcc.target/arm/ testsuite. Christophe, do you think you
could handle that incrementally?
2022-04-26 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/105374
* tree-ssa-reassoc.cc (eliminate_redundant_comparison): Punt if
!fold_convertible_p rather than assuming fold_convert must succeed.
--- gcc/tree-ssa-reassoc.cc.jj 2022-04-14 13:46:59.690140053 +0200
+++ gcc/tree-ssa-reassoc.cc 2022-04-25 15:34:03.811473537 +0200
@@ -2254,7 +2254,11 @@ eliminate_redundant_comparison (enum tre
BIT_AND_EXPR or BIT_IOR_EXPR was of a wider integer type,
we need to convert. */
if (!useless_type_conversion_p (TREE_TYPE (curr->op), TREE_TYPE (t)))
- t = fold_convert (TREE_TYPE (curr->op), t);
+ {
+ if (!fold_convertible_p (TREE_TYPE (curr->op), t))
+ continue;
+ t = fold_convert (TREE_TYPE (curr->op), t);
+ }
if (TREE_CODE (t) != INTEGER_CST
&& !operand_equal_p (t, curr->op, 0))
Jakub
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374]
2022-04-26 7:24 [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374] Jakub Jelinek
@ 2022-04-26 7:51 ` Richard Biener
2022-04-26 7:59 ` Christophe Lyon
1 sibling, 0 replies; 3+ messages in thread
From: Richard Biener @ 2022-04-26 7:51 UTC (permalink / raw)
To: Jakub Jelinek; +Cc: gcc-patches, Christophe Lyon
On Tue, 26 Apr 2022, Jakub Jelinek wrote:
> Hi!
>
> As mentioned in the PR, we ICE because maybe_fold_*_comparisons returns
> an expression with V4SImode type and we try to fold_convert it to
> V4BImode, which isn't allowed.
>
> IMHO no matter whether we change maybe_fold_*_comparisons we should
> play safe on the reassoc side and punt if we can't convert like
> we punt for many other reasons. This fixes the testcase on ARM.
>
> Bootstrapped/regtested on {x86_64,i686,armv7hl,aarch64,powerpc64le}-linux,
> ok for trunk?
OK.
Richard.
> Testcase not included, not exactly sure where and what directives it
> should have in gcc.target/arm/ testsuite. Christophe, do you think you
> could handle that incrementally?
>
> 2022-04-26 Jakub Jelinek <jakub@redhat.com>
>
> PR tree-optimization/105374
> * tree-ssa-reassoc.cc (eliminate_redundant_comparison): Punt if
> !fold_convertible_p rather than assuming fold_convert must succeed.
>
> --- gcc/tree-ssa-reassoc.cc.jj 2022-04-14 13:46:59.690140053 +0200
> +++ gcc/tree-ssa-reassoc.cc 2022-04-25 15:34:03.811473537 +0200
> @@ -2254,7 +2254,11 @@ eliminate_redundant_comparison (enum tre
> BIT_AND_EXPR or BIT_IOR_EXPR was of a wider integer type,
> we need to convert. */
> if (!useless_type_conversion_p (TREE_TYPE (curr->op), TREE_TYPE (t)))
> - t = fold_convert (TREE_TYPE (curr->op), t);
> + {
> + if (!fold_convertible_p (TREE_TYPE (curr->op), t))
> + continue;
> + t = fold_convert (TREE_TYPE (curr->op), t);
> + }
>
> if (TREE_CODE (t) != INTEGER_CST
> && !operand_equal_p (t, curr->op, 0))
>
> Jakub
>
>
--
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH, Maxfeldstrasse 5, 90409 Nuernberg,
Germany; GF: Ivo Totev; HRB 36809 (AG Nuernberg)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374]
2022-04-26 7:24 [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374] Jakub Jelinek
2022-04-26 7:51 ` Richard Biener
@ 2022-04-26 7:59 ` Christophe Lyon
1 sibling, 0 replies; 3+ messages in thread
From: Christophe Lyon @ 2022-04-26 7:59 UTC (permalink / raw)
To: Jakub Jelinek, Richard Biener; +Cc: gcc-patches
On 4/26/22 09:24, Jakub Jelinek wrote:
> Hi!
>
> As mentioned in the PR, we ICE because maybe_fold_*_comparisons returns
> an expression with V4SImode type and we try to fold_convert it to
> V4BImode, which isn't allowed.
>
> IMHO no matter whether we change maybe_fold_*_comparisons we should
> play safe on the reassoc side and punt if we can't convert like
> we punt for many other reasons. This fixes the testcase on ARM.
>
> Bootstrapped/regtested on {x86_64,i686,armv7hl,aarch64,powerpc64le}-linux,
> ok for trunk?
>
> Testcase not included, not exactly sure where and what directives it
> should have in gcc.target/arm/ testsuite. Christophe, do you think you
> could handle that incrementally?
Yes, sure, I'll take a look.
Thanks for the fix!
>
> 2022-04-26 Jakub Jelinek <jakub@redhat.com>
>
> PR tree-optimization/105374
> * tree-ssa-reassoc.cc (eliminate_redundant_comparison): Punt if
> !fold_convertible_p rather than assuming fold_convert must succeed.
>
> --- gcc/tree-ssa-reassoc.cc.jj 2022-04-14 13:46:59.690140053 +0200
> +++ gcc/tree-ssa-reassoc.cc 2022-04-25 15:34:03.811473537 +0200
> @@ -2254,7 +2254,11 @@ eliminate_redundant_comparison (enum tre
> BIT_AND_EXPR or BIT_IOR_EXPR was of a wider integer type,
> we need to convert. */
> if (!useless_type_conversion_p (TREE_TYPE (curr->op), TREE_TYPE (t)))
> - t = fold_convert (TREE_TYPE (curr->op), t);
> + {
> + if (!fold_convertible_p (TREE_TYPE (curr->op), t))
> + continue;
> + t = fold_convert (TREE_TYPE (curr->op), t);
> + }
>
> if (TREE_CODE (t) != INTEGER_CST
> && !operand_equal_p (t, curr->op, 0))
>
> Jakub
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-04-26 7:24 [PATCH] reassoc: Don't call fold_convert if !fold_convertible_p [PR105374] Jakub Jelinek
2022-04-26 7:51 ` Richard Biener
2022-04-26 7:59 ` Christophe Lyon
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