IBF: Avoid unaligned load on 32 bit platforms

amaxcz · XrXr · commit 354d47ae5bc4 · 2025-09-25T16:03:15.000-04:00
[Bug #21569]
diff --git a/compile.c b/compile.c
@@ -14097,8 +14097,10 @@ ibf_dump_object_float(struct ibf_dump *dump, VALUE obj)
 static VALUE
 ibf_load_object_float(const struct ibf_load *load, const struct ibf_object_header *header, ibf_offset_t offset)
 {
-    const double *dblp = IBF_OBJBODY(double, offset);
-    return DBL2NUM(*dblp);
+    double d;
+    /* Avoid unaligned VFP load on ARMv7; IBF payload may be unaligned (C99 6.3.2.3 p7). */
+    memcpy(&d, IBF_OBJBODY(double, offset), sizeof(d));
+    return DBL2NUM(d);
 }
 
 static void

Original file line number	Diff line number	Diff line change
`@@ -14097,8 +14097,10 @@ ibf_dump_object_float(struct ibf_dump *dump, VALUE obj)`
`14097`	`14097`	`static VALUE`
`14098`	`14098`	`ibf_load_object_float(const struct ibf_load load, const struct ibf_object_header header, ibf_offset_t offset)`
`14099`	`14099`	`{`
`14100`		`- const double *dblp = IBF_OBJBODY(double, offset);`
`14101`		`- return DBL2NUM(*dblp);`
	`14100`	`+ double d;`
	`14101`	`+ /* Avoid unaligned VFP load on ARMv7; IBF payload may be unaligned (C99 6.3.2.3 p7). */`
	`14102`	`+ memcpy(&d, IBF_OBJBODY(double, offset), sizeof(d));`
	`14103`	`+ return DBL2NUM(d);`
`14102`	`14104`	`}`
`14103`	`14105`
`14104`	`14106`	`static void`