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SimplifyLibCalls: Push TLI through the exp2->ldexp transform.

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For the odd case of platforms with exp2 available but not ldexp.

llvm-svn: 200795
This commit is contained in:
Benjamin Kramer 2014-02-04 20:27:23 +00:00
parent 9a2318e757
commit 700474a946
4 changed files with 62 additions and 27 deletions
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6
include/llvm/Target/TargetLibraryInfo.h
View File

@ -352,6 +352,12 @@ namespace llvm {
labs,
/// int lchown(const char *path, uid_t owner, gid_t group);
lchown,
/// double ldexp(double x, int n);
ldexp,
/// float ldexpf(float x, int n);
ldexpf,
/// long double ldexpl(long double x, int n);
ldexpl,
/// long long int llabs(long long int j);
llabs,
/// double log(double x);

5
lib/Target/TargetLibraryInfo.cpp
View File

@ -190,6 +190,9 @@ const char* TargetLibraryInfo::StandardNames[LibFunc::NumLibFuncs] =
"isdigit",
"labs",
"lchown",
"ldexp",
"ldexpf",
"ldexpl",
"llabs",
"log",
"log10",
@ -432,6 +435,8 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T,
TLI.setUnavailable(LibFunc::fminl);
TLI.setUnavailable(LibFunc::fmodl);
TLI.setUnavailable(LibFunc::frexpl);
TLI.setUnavailable(LibFunc::ldexpf);
TLI.setUnavailable(LibFunc::ldexpl);
TLI.setUnavailable(LibFunc::logl);
TLI.setUnavailable(LibFunc::modfl);
TLI.setUnavailable(LibFunc::powl);

54
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1274,37 +1274,37 @@ struct Exp2Opt : public UnsafeFPLibCallOptimization {
Value *Op = CI->getArgOperand(0);
// Turn exp2(sitofp(x)) -> ldexp(1.0, sext(x)) if sizeof(x) <= 32
// Turn exp2(uitofp(x)) -> ldexp(1.0, zext(x)) if sizeof(x) < 32
Value *LdExpArg = 0;
if (SIToFPInst *OpC = dyn_cast<SIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() <= 32)
LdExpArg = B.CreateSExt(OpC->getOperand(0), B.getInt32Ty());
} else if (UIToFPInst *OpC = dyn_cast<UIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() < 32)
LdExpArg = B.CreateZExt(OpC->getOperand(0), B.getInt32Ty());
}
LibFunc::Func LdExp = LibFunc::ldexpl;
if (Op->getType()->isFloatTy())
LdExp = LibFunc::ldexpf;
else if (Op->getType()->isDoubleTy())
LdExp = LibFunc::ldexp;
if (LdExpArg) {
const char *Name;
if (Op->getType()->isFloatTy())
Name = "ldexpf";
else if (Op->getType()->isDoubleTy())
Name = "ldexp";
else
Name = "ldexpl";
if (TLI->has(LdExp)) {
Value *LdExpArg = 0;
if (SIToFPInst *OpC = dyn_cast<SIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() <= 32)
LdExpArg = B.CreateSExt(OpC->getOperand(0), B.getInt32Ty());
} else if (UIToFPInst *OpC = dyn_cast<UIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() < 32)
LdExpArg = B.CreateZExt(OpC->getOperand(0), B.getInt32Ty());
}
Constant *One = ConstantFP::get(*Context, APFloat(1.0f));
if (!Op->getType()->isFloatTy())
One = ConstantExpr::getFPExtend(One, Op->getType());
if (LdExpArg) {
Constant *One = ConstantFP::get(*Context, APFloat(1.0f));
if (!Op->getType()->isFloatTy())
One = ConstantExpr::getFPExtend(One, Op->getType());
Module *M = Caller->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(),
B.getInt32Ty(), NULL);
CallInst *CI = B.CreateCall2(Callee, One, LdExpArg);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
Module *M = Caller->getParent();
Value *Callee =
M->getOrInsertFunction(TLI->getName(LdExp), Op->getType(),
Op->getType(), B.getInt32Ty(), NULL);
CallInst *CI = B.CreateCall2(Callee, One, LdExpArg);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
return CI;
}
}
return Ret;
}

24
test/Transforms/InstCombine/exp2-1.ll
View File

@ -1,6 +1,7 @@
; Test that the exp2 library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
; RUN: opt < %s -instcombine -S -mtriple=i386-pc-win32 | FileCheck %s -check-prefix=CHECK-WIN
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@ -74,3 +75,26 @@ define float @test_simplify8(i8 zeroext %x) {
; CHECK: call float @ldexpf
ret float %ret
}
declare double @llvm.exp2.f64(double)
declare float @llvm.exp2.f32(float)
define double @test_simplify9(i8 zeroext %x) {
; CHECK-LABEL: @test_simplify9(
; CHECK-WIN-LABEL: @test_simplify9(
%conv = uitofp i8 %x to double
%ret = call double @llvm.exp2.f64(double %conv)
; CHECK: call double @ldexp
; CHECK-WIN: call double @ldexp
ret double %ret
}
define float @test_simplify10(i8 zeroext %x) {
; CHECK-LABEL: @test_simplify10(
; CHECK-WIN-LABEL: @test_simplify10(
%conv = uitofp i8 %x to float
%ret = call float @llvm.exp2.f32(float %conv)
; CHECK: call float @ldexpf
; CHECK-WIN-NOT: call float @ldexpf
ret float %ret
}