Zero init SIMD overspill

solidpixel · solidpixel · commit 00206dac7f8d · 2024-04-19T21:15:05.000+01:00
Ensures that SIMD overspill is ZI for decompression, in order to
keep UBSAN happy. In reality the UB SIMD lanes are never actually
written back to memory, but this keeps UBSAN useful as a tool.
diff --git a/Source/astcenc_entry.cpp b/Source/astcenc_entry.cpp
@@ -1167,7 +1167,7 @@ astcenc_error astcenc_decompress_image(
 		return ASTCENC_ERR_OUT_OF_MEM;
 	}
 
-	image_block blk;
+	image_block blk {};
 	blk.texel_count = static_cast<uint8_t>(block_x * block_y * block_z);
 
 	// Decode mode inferred from the output data type

Original file line number	Diff line number	Diff line change
`@@ -1167,7 +1167,7 @@ astcenc_error astcenc_decompress_image(`
`1167`	`1167`	`return ASTCENC_ERR_OUT_OF_MEM;`
`1168`	`1168`	`}`
`1169`	`1169`
`1170`		`- image_block blk;`
	`1170`	`+ image_block blk {};`
`1171`	`1171`	`blk.texel_count = static_cast<uint8_t>(block_x * block_y * block_z);`
`1172`	`1172`
`1173`	`1173`	`// Decode mode inferred from the output data type`