https://bugzilla.gdcproject.org/show_bug.cgi?id=288
Bug ID: 288
Summary: strange nonsensical x86-64 code generation with -O3 -
rats' nest of useless conditional jumps
Product: GDC
Version: 7.x
Hardware: x86_64
OS: Linux
Status: NEW
Severity: minor
Priority: Normal
Component: gdc
Assignee: ibuc...@gdcproject.org
Reporter: ce...@cecilward.com
Created attachment 93
--> https://bugzilla.gdcproject.org/attachment.cgi?id=93&action=edit
D source; debug-only c9de is the weird stuff so compiling with -fdebug is
essential because the source code in question is inside a D 'debug' cond so
otherwise no relevant code will be generated
This seems to be a quirk in the code generated by the GCC x86-64 backend itself
in my humble opinion, and very much doubt it has much to do with GDC itself. I
am not alleging that the generated code does not perform the correct function,
I haven't gone through it carefully enough, but the x64 code generated is just
very strange and utterly pointless.
I compiled with GDC 7.x for x64 with
-O3 -fdebug -march=skylake
See the long list of useless conditional jumps towards the end of the first
function in the asm output (whose demangled name is test.t1(unit))
--
You are receiving this mail because:
You are watching all bug changes.
