Module Name: src
Committed By: rin
Date: Sat Oct 7 11:58:54 UTC 2023
Modified Files:
src/external/gpl3/gcc.old/dist/gcc: dse.c
Log Message:
gcc.old: PR port-vax/57646 patch provided by Kalvis Duckmanton [5/21]
Shift right by positive values that are less than HOST_BITS_PER_WIDE_INT
to avoid illegal instruction exceptions on VAX.
XXXRO: Hidden within ``#ifdef NB_FIX_VAX_BACKEND'' and enabled only for
vax at the moment.
To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/external/gpl3/gcc.old/dist/gcc/dse.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/external/gpl3/gcc.old/dist/gcc/dse.c
diff -u src/external/gpl3/gcc.old/dist/gcc/dse.c:1.13 src/external/gpl3/gcc.old/dist/gcc/dse.c:1.14
--- src/external/gpl3/gcc.old/dist/gcc/dse.c:1.13 Mon Feb 20 02:11:05 2023
+++ src/external/gpl3/gcc.old/dist/gcc/dse.c Sat Oct 7 11:58:54 2023
@@ -301,7 +301,12 @@ static unsigned HOST_WIDE_INT
lowpart_bitmask (int n)
{
unsigned HOST_WIDE_INT mask = HOST_WIDE_INT_M1U;
-#if 1 // XXXMRG
+#ifdef NB_FIX_VAX_BACKEND
+ if (n < 1)
+ return 0;
+ if (n >= HOST_BITS_PER_WIDE_INT)
+ return mask;
+#else // XXXMRG
gcc_assert(n >= 0 && n <= HOST_BITS_PER_WIDE_INT);
if (n == 0)
return 0;
@@ -1340,6 +1345,10 @@ all_positions_needed_p (store_info *s_in
return false;
return true;
}
+#ifdef NB_FIX_VAX_BACKEND
+ if (const_start >= HOST_BITS_PER_WIDE_INT || const_start < 0)
+ return true;
+#endif
else
{
unsigned HOST_WIDE_INT mask
