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Do not optimise fprintf() calls if its return value is used.
Differential Revision: http://llvm-reviews.chandlerc.com/D620 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179661 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1518,6 +1518,12 @@ struct FPrintFOpt : public LibCallOptimization {
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if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
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return 0;
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// Do not do any of the following transformations if the fprintf return
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// value is used, in general the fprintf return value is not compatible
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// with fwrite(), fputc() or fputs().
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if (!CI->use_empty())
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return 0;
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// fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
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if (CI->getNumArgOperands() == 2) {
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for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
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@ -1527,11 +1533,10 @@ struct FPrintFOpt : public LibCallOptimization {
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// These optimizations require DataLayout.
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if (!TD) return 0;
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Value *NewCI = EmitFWrite(CI->getArgOperand(1),
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ConstantInt::get(TD->getIntPtrType(*Context),
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FormatStr.size()),
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CI->getArgOperand(0), B, TD, TLI);
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return NewCI ? ConstantInt::get(CI->getType(), FormatStr.size()) : 0;
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return EmitFWrite(CI->getArgOperand(1),
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ConstantInt::get(TD->getIntPtrType(*Context),
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FormatStr.size()),
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CI->getArgOperand(0), B, TD, TLI);
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}
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// The remaining optimizations require the format string to be "%s" or "%c"
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@ -1544,14 +1549,12 @@ struct FPrintFOpt : public LibCallOptimization {
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if (FormatStr[1] == 'c') {
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// fprintf(F, "%c", chr) --> fputc(chr, F)
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if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
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Value *NewCI = EmitFPutC(CI->getArgOperand(2), CI->getArgOperand(0), B,
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TD, TLI);
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return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
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return EmitFPutC(CI->getArgOperand(2), CI->getArgOperand(0), B, TD, TLI);
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}
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if (FormatStr[1] == 's') {
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// fprintf(F, "%s", str) --> fputs(str, F)
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if (!CI->getArgOperand(2)->getType()->isPointerTy() || !CI->use_empty())
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if (!CI->getArgOperand(2)->getType()->isPointerTy())
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return 0;
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return EmitFPutS(CI->getArgOperand(2), CI->getArgOperand(0), B, TD, TLI);
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}
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@ -78,3 +78,12 @@ define void @test_no_simplify2(%FILE* %fp, double %d) {
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ret void
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; CHECK-NEXT: ret void
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}
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define i32 @test_no_simplify3(%FILE* %fp) {
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; CHECK: @test_no_simplify3
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%fmt = getelementptr [13 x i8]* @hello_world, i32 0, i32 0
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%1 = call i32 (%FILE*, i8*, ...)* @fprintf(%FILE* %fp, i8* %fmt)
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; CHECK-NEXT: call i32 (%FILE*, i8*, ...)* @fprintf(%FILE* %fp, i8* getelementptr inbounds ([13 x i8]* @hello_world, i32 0, i32 0))
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ret i32 %1
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; CHECK-NEXT: ret i32 %1
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}
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