* Patch to fix PR92176
@ 2019-12-06 19:35 Vladimir Makarov
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From: Vladimir Makarov @ 2019-12-06 19:35 UTC (permalink / raw)
To: gcc-patches
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The following patch fixes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92176
The patch was tested on i686, x86-64, and ppc64.
Committed as r279061.
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Index: ChangeLog
===================================================================
--- ChangeLog (revision 279060)
+++ ChangeLog (working copy)
@@ -1,3 +1,10 @@
+2019-12-06 Andreas Krebbel <krebbel@linux.ibm.com>
+ Vladimir Makarov <vmakarov@redhat.com>
+
+ PR rtl-optimization/92176
+ * lra.c (simplify_subreg_regno): Don't permit unconditional
+ changing mode for LRA too.
+
2019-12-06 Richard Sandiford <richard.sandiford@arm.com>
* target.h (TCTX_ALLOCATION, TCTX_DEALLOCATION, TCTX_EXCEPTIONS)
Index: rtlanal.c
===================================================================
--- rtlanal.c (revision 279060)
+++ rtlanal.c (working copy)
@@ -3951,9 +3951,7 @@ simplify_subreg_regno (unsigned int xreg
/* Give the backend a chance to disallow the mode change. */
if (GET_MODE_CLASS (xmode) != MODE_COMPLEX_INT
&& GET_MODE_CLASS (xmode) != MODE_COMPLEX_FLOAT
- && !REG_CAN_CHANGE_MODE_P (xregno, xmode, ymode)
- /* We can use mode change in LRA for some transformations. */
- && ! lra_in_progress)
+ && !REG_CAN_CHANGE_MODE_P (xregno, xmode, ymode))
return -1;
/* We shouldn't simplify stack-related registers. */
Index: testsuite/ChangeLog
===================================================================
--- testsuite/ChangeLog (revision 279060)
+++ testsuite/ChangeLog (working copy)
@@ -1,3 +1,9 @@
+2019-12-06 Andreas Krebbel <krebbel@linux.ibm.com>
+ Vladimir Makarov <vmakarov@redhat.com>
+
+ PR rtl-optimization/92176
+ * gcc.target/s390/pr92176.c: New test.
+
2019-12-06 Martin Sebor <msebor@redhat.com>
* gcc.dg/Wstringop-overflow-23.c: Use the correct argument type.
Index: testsuite/gcc.target/s390/pr92176.c
===================================================================
--- testsuite/gcc.target/s390/pr92176.c (nonexistent)
+++ testsuite/gcc.target/s390/pr92176.c (working copy)
@@ -0,0 +1,33 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -march=z13 -mzarch" } */
+
+int a = 5, b, c, d, g, h, k, l, m, o;
+static int e[7];
+int *volatile i = &d;
+long long j;
+
+short p(int f, int dummy) {
+ k = 0 != (*e = m);
+ j = 0;
+ for (; j < 59; j = j + 1)
+ *i |= b;
+ g = 1;
+ for (; g <= 4; g++) {
+ o = 0;
+ for (; o <= 4; o++)
+ i = (int * volatile)(long)l;
+ }
+ return 42;
+}
+
+void
+q() {
+ char *n = (char*)&b;
+
+ (*n = a) == p(e[6], c);
+ for (; h;)
+ for (;;)
+ ;
+}
+
+/* { dg-final { scan-assembler-not {(?n)^\tvsteb\t.+,0$} } } */
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