[llvm-bugs] [Bug 27177] New: inlining and constant propagation to intrinsics

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Apr 1 04:43:55 PDT 2016


            Bug ID: 27177
           Summary: inlining and constant propagation to intrinsics
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mail at sven-woop.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16148
  --> https://llvm.org/bugs/attachment.cgi?id=16148&action=edit

I just ran into an issue where constants are not properly propagated to an
intrinsic which requires a constant argument. Compilation fails with an
appropiate error. Here a simple reproducer:

#include <immintrin.h>

inline __attribute__((always_inline)) void bla(__m128 a, __m128 b, const int x)
  _mm_blend_ps(a, b, x);

int main()
  __m128 a = _mm_set1_ps(1.0f);
  __m128 b = _mm_set1_ps(2.0f);
  const int x = 4;

Looks like the inlining happens too late.

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