https://bugs.llvm.org/show_bug.cgi?id=39679
Bug ID: 39679
Summary: Disabling fp-contraction doesn't work. [#pragma clang
fp contract(off)]
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Trying to prevent contracting (*,+) into an FMA operation (to guarantee
cross_product(a, a) == 0).
I add '#pragma clang fp contract(off)' to the start of a block, compiler
accepts the pragma, but still generates an FMA instruction.
Example at: godbolt.org/z/Cg8rYi
Thanks.
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