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--- a/stage2/fsys_iso9660.c
+++ b/stage2/fsys_iso9660.c
@@ -83,10 +83,7 @@ iso9660_devread (int sector, int byte_of
sector += (byte_offset >> sector_size_lg2);
byte_offset &= (buf_geom.sector_size - 1);
- asm volatile ("shl%L0 %1,%0"
- : "=r"(sector)
- : "Ic"((int8_t)(ISO_SECTOR_BITS - sector_size_lg2)),
- "0"(sector));
+ sector <<= ISO_SECTOR_BITS - sector_size_lg2;
#if !defined(STAGE1_5)
if (disk_read_hook && debug)
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