[LLVMbugs] [Bug 20157] New: ext_vector_type is not compatible with constexpr

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Jun 28 14:02:27 PDT 2014


            Bug ID: 20157
           Summary: ext_vector_type is not compatible with constexpr
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: chris.a.ferguson at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

It seems many uses of a type based on ext_vector_type are not suitable for use
in a constexpr, for example:

typedef float __attribute__((ext_vector_type(4))) float4;

constexpr float4 MultiplyByTwo(float4 x)
  return x * 2.0f; 

main.cpp:3:18: error: constexpr function never produces a constant expression

constexpr float4 MultiplyByTwo(float4 x)
main.cpp:5:12: note: subexpression not valid in a constant expression

  return x * 2.0f; 
1 error generated.

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