https://sourceware.org/bugzilla/show_bug.cgi?id=32811
Bug ID: 32811
Summary: nooptimize doesn't apply to immediates
Product: binutils
Version: 2.35
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: andi-bz at firstfloor dot org
Target Milestone: ---
The documentation says
* '{nooptimize}' - disable instruction size optimization.
I would have expected it to apply for immediates too, but it doesn't seem to
have an effect:
{disp32} addq $0,%rbx
{nooptimize} addq $0,%rbx
addq $0xffff,%rbx
0: 48 83 c3 00 add $0x0,%rbx
4: 48 83 c3 00 add $0x0,%rbx
8: 48 81 c3 ff ff 00 00 add $0xffff,%rbx
I would have expected all three instructions to have the size size.
This would be useful to be able to generate constant sized code with .rept when
the immediate depends on the loop iteration.
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