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ACATS cxg2021 fails at -O3 #2793

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llvmbot opened this issue Jun 8, 2008 · 5 comments
Closed

ACATS cxg2021 fails at -O3 #2793

llvmbot opened this issue Jun 8, 2008 · 5 comments
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bugzilla Issues migrated from bugzilla llvm-tools All llvm tools that do not have corresponding tag obsolete wontfix Resolved as "WON'T FIX." Not "INVALID" — the issue is real, but we can't or won't fix it

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@llvmbot
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llvmbot commented Jun 8, 2008

Bugzilla Link 2421
Version trunk
OS Linux
Reporter LLVM Bugzilla Contributor

Extended Description

Building the ACATS tests at -O3 causes one additional failure: cxg2021.

@llvmbot
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llvmbot commented Jan 29, 2009

This went away when the gcc inliner was disabled. Most likely
the underlying problem has just been covered up, but I don't
care enough to investigate further. Note that the original
failure only occurred when using the x86 floating point stack,
and not when using sse registers.

@llvmbot
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llvmbot commented Feb 2, 2009

This recently started failing again (at -O2).

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llvmbot commented Feb 6, 2009

Remarks: this seems to be due to extra precision in x86-32 floating
point registers versus the precision (64 bits) when stored to a stack
slot. The test is testing 64 bit precision, and as far as I can see
it shouldn't matter whether you use stack stores or registers, since
both give values inside the Ada "model interval" (Ada uses an interval
arithmetic model for floating point). I wasn't able to find anything
obviously wrong with the LLVM generated code. Currently I suspect that
the test is wrong, but didn't finish analyzing it yet.

@lattner
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lattner commented Jun 19, 2009

still a problem?

@llvmbot
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llvmbot commented Jun 19, 2009

Yes, still a problem. In fact it now fails at -O2! It is not clear if this
is a bug in LLVM or in the test. In order to resolve this I wrote my own
simulator of Ada floating point interval arithmetic, but having done so never
found the time to apply it to the analysis of this test, d'oh!

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
@asl asl added obsolete wontfix Resolved as "WON'T FIX." Not "INVALID" — the issue is real, but we can't or won't fix it labels Dec 14, 2021
@asl asl closed this as completed Dec 14, 2021
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Labels
bugzilla Issues migrated from bugzilla llvm-tools All llvm tools that do not have corresponding tag obsolete wontfix Resolved as "WON'T FIX." Not "INVALID" — the issue is real, but we can't or won't fix it
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