[LLVMbugs] [Bug 16711] New: Multiple identical floating point constants emitted.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Jul 25 19:25:00 PDT 2013


            Bug ID: 16711
           Summary: Multiple identical floating point constants emitted.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: silvas at purdue.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

clang -O3 emits two copies of the constant `42.0f` for this code:
float user1(float F) {
  return F * 42.0f;
float user2(float F) {
  return F * 42.0f;


        .long   1109917696              ## float 42
        mulss   LCPI0_0(%rip), %xmm0
        .long   1109917696              ## float 42
        mulss   LCPI1_0(%rip), %xmm0

For 3 functions, 3 copies of the constant are emitted, etc. The constants ought
to be uniqued.

`-arch armv7` also seems to experience the same issue.

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