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Don't generate floating point stubs for mips16 code if the function

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is actually an instrinsic that will not occur in libc. This list here
is not exhaustive but fixes the one places in test-suite where this occurs.
I have filed a bug against myself to research the full list and add them
to the array of such cases. In the future, actual stub generation will occur
in a later phase and we won't need this code because we will know at that time
during the compilation that in fact no helper function was even needed.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188149 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reed Kotler 2013-08-11 21:30:27 +00:00
parent 55db69c97e
commit 5e4b95b3fe
2 changed files with 38 additions and 1 deletions
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14
lib/Target/Mips/Mips16HardFloat.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <string>
static void inlineAsmOut
@ -320,6 +321,17 @@ static void assureFPCallStub(Function &F, Module *M,
new UnreachableInst(Context, BB);
}
//
// Functions that are inline intrinsics don't need helpers.
//
std::string IntrinsicInline[] =
{"fabs"};
bool isIntrinsicInline(Function *F) {
return std::binary_search(
IntrinsicInline, array_endof(IntrinsicInline),
F->getName());
}
//
// Returns of float, double and complex need to be handled with a helper
// function.
@ -372,7 +384,7 @@ static bool fixupFPReturnAndCall
// helper functions
if (Subtarget.getRelocationModel() != Reloc::PIC_ ) {
Function *F_ = CI->getCalledFunction();
if (F_ && needsFPHelperFromSig(*F_)) {
if (F_ && !isIntrinsicInline(F_) && needsFPHelperFromSig(*F_)) {
assureFPCallStub(*F_, M, Subtarget);
Modified=true;
}

25
test/CodeGen/Mips/f16abs.ll Normal file
View File

@ -0,0 +1,25 @@
; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=static < %s | FileCheck %s -check-prefix=static
@y = global double -1.450000e+00, align 8
@x = common global double 0.000000e+00, align 8
; Function Attrs: nounwind optsize
define i32 @main() #0 {
entry:
%0 = load double* @y, align 8
%call = tail call double @fabs(double %0) #2
store double %call, double* @x, align 8
; static-NOT: .ent __call_stub_fp_fabs
; static-NOT: jal fabs
ret i32 0
}
; Function Attrs: nounwind optsize readnone
declare double @fabs(double) #1
attributes #0 = { nounwind optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
attributes #1 = { nounwind optsize readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
attributes #2 = { nounwind optsize readnone }