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* [gcc r12-7106] combine: Check for paradoxical subreg.
@ 2022-02-08 14:31 Robin Dapp
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From: Robin Dapp @ 2022-02-08 14:31 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:38a177fa4c2fd1ce75581145b3b8f12592b4aacd
commit r12-7106-g38a177fa4c2fd1ce75581145b3b8f12592b4aacd
Author: Robin Dapp <rdapp@linux.ibm.com>
Date: Tue Feb 8 14:39:16 2022 +0100
combine: Check for paradoxical subreg.
This adds a check for a paradoxical subreg in reg_subword_p ()
in order to prevent an ICE on s390 in try_combine () triggered
by the movqicc expander.
gcc/ChangeLog:
* combine.cc (reg_subword_p): Check for paradoxical subreg.
Diff:
---
gcc/combine.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/combine.cc b/gcc/combine.cc
index 7683f8250fe..c264ededf20 100644
--- a/gcc/combine.cc
+++ b/gcc/combine.cc
@@ -2411,6 +2411,7 @@ reg_subword_p (rtx x, rtx reg)
x = XEXP (x, 0);
return GET_CODE (x) == SUBREG
+ && !paradoxical_subreg_p (x)
&& SUBREG_REG (x) == reg
&& GET_MODE_CLASS (GET_MODE (x)) == MODE_INT;
}
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