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* [gcc r12-7416] PR middle-end/80270: ICE in extract_bit_field_1
@ 2022-02-28 22:27 Roger Sayle
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From: Roger Sayle @ 2022-02-28 22:27 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7e5c6edeb1b2339e10f10bee270e61dbad985800
commit r12-7416-g7e5c6edeb1b2339e10f10bee270e61dbad985800
Author: Roger Sayle <roger@nextmovesoftware.com>
Date: Mon Feb 28 22:26:43 2022 +0000
PR middle-end/80270: ICE in extract_bit_field_1
This patch fixes PR middle-end/80270, an ICE-on-valid regression, where
performing a bitfield extraction on a variable explicitly stored in a
hard register by the user causes a segmentation fault during RTL
expansion. Nearly identical source code without the "asm" qualifier
compiles fine. The point of divergence is in simplify_gen_subreg
which tries to avoid creating non-trivial SUBREGs of hard registers,
to avoid problems during register allocation. This suggests the
simple solution proposed here, to copy hard registers to a new pseudo
in extract_integral_bit_field, just before calling simplify_gen_subreg.
2022-02-28 Roger Sayle <roger@nextmovesoftware.com>
Eric Botcazou <ebotcazou@adacore.com>
gcc/ChangeLog
PR middle-end/80270
* expmed.cc (extract_integral_bit_field): If OP0 is a hard
register, copy it to a pseudo before calling simplify_gen_subreg.
gcc/testsuite/ChangeLog
* gcc.target/i386/pr80270.c: New test case.
Diff:
---
gcc/expmed.cc | 4 ++++
gcc/testsuite/gcc.target/i386/pr80270.c | 21 +++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/gcc/expmed.cc b/gcc/expmed.cc
index 80a16cedfd5..ed39c88bd04 100644
--- a/gcc/expmed.cc
+++ b/gcc/expmed.cc
@@ -1975,6 +1975,10 @@ extract_integral_bit_field (rtx op0, opt_scalar_int_mode op0_mode,
unsignedp, reverse);
return convert_extracted_bit_field (target, mode, tmode, unsignedp);
}
+ /* If OP0 is a hard register, copy it to a pseudo before calling
+ simplify_gen_subreg. */
+ if (REG_P (op0) && HARD_REGISTER_P (op0))
+ op0 = copy_to_reg (op0);
op0 = simplify_gen_subreg (word_mode, op0, op0_mode.require (),
bitnum / BITS_PER_WORD * UNITS_PER_WORD);
op0_mode = word_mode;
diff --git a/gcc/testsuite/gcc.target/i386/pr80270.c b/gcc/testsuite/gcc.target/i386/pr80270.c
new file mode 100644
index 00000000000..89e9c33d090
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr80270.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -msse" } */
+
+typedef int v8 __attribute__((vector_size(8)));
+struct S1 {
+ v8 s1f;
+};
+struct S2 {
+ struct S1 s2f1;
+ v8 s2f2;
+};
+
+extern void foo(int);
+
+void bar() {
+ int tmp, i = 3;
+ register struct S2 b asm("xmm0");
+ tmp = b.s2f1.s1f[i];
+ foo(tmp);
+}
+
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