Small Device C Compiler (SDCC) / Feature Requests / #1024 Deal with side-channels in z80-related ports

The Small Device C Compiler (SDCC), targeting 8-bit architectures

#1024 Deal with side-channels in z80-related ports

Milestone: None

Status: open

Owner: nobody

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Priority: 5

Updated: 2026-06-04

Created: 2026-06-04

Creator: Philipp Klaus Krause

Private: No

Now that work on [feature-requests:#1006] has started, we should also look into the z80 (and related) -specific aspects. We then need fixes or documentation. A first view shows:

Side channels are created in trunk codegen for addition and right shift (data from left operand leaked). These will be fixed in the nosidechannel branch today.
There are side-channels in codegen for multiplication, comparison, shifts (right operand leaked), reads-from signed bit-fields, signed casts
There are no side-channels introduced in peephole optimizer rules
There are side-channels in support routines.

Description has changed:

Diff:

--- old
+++ new
@@ -1,4 +1,4 @@
-Now that work on [feature-requests:#1006] has started, we should also look into the stm8-specific aspects. We then need fixes or documentation. A first view shows:
+Now that work on [feature-requests:#1006] has started, we should also look into the z80 (and related) -specific aspects. We then need fixes or documentation. A first view shows:


 * Side channels are created in trunk codegen for addition and right shift (data from left operand leaked). These will be fixed in the nosidechannel branch today.
 * There are side-channels in codegen for multiplication, comparison, shifts (right operand leaked), reads-from signed bit-fields, signed casts

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Feature Requests: #1006

Deal with side-channels in z80-related ports

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#1024 Deal with side-channels in z80-related ports

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