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instcombine: Migrate isascii optimizations

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This patch migrates the isascii optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168579 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge 2012-11-26 03:10:07 +00:00
parent a0798ec377
commit 017bb750ab
3 changed files with 49 additions and 20 deletions
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20
lib/Transforms/Scalar/SimplifyLibCalls.cpp
View File

@ -99,24 +99,6 @@ namespace {
// Integer Optimizations
//===----------------------------------------------------------------------===//
//===---------------------------------------===//
// 'isascii' Optimizations
struct IsAsciiOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
!FT->getParamType(0)->isIntegerTy(32))
return 0;
// isascii(c) -> c <u 128
Value *Op = CI->getArgOperand(0);
Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
//===---------------------------------------===//
// 'toascii' Optimizations
@ -502,7 +484,6 @@ namespace {
StringMap<LibCallOptimization*> Optimizations;
// Integer Optimizations
IsAsciiOpt IsAscii;
ToAsciiOpt ToAscii;
// Formatting and IO Optimizations
SPrintFOpt SPrintF; PrintFOpt PrintF;
@ -563,7 +544,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
/// we know.
void SimplifyLibCalls::InitOptimizations() {
// Integer Optimizations
Optimizations["isascii"] = &IsAscii;
Optimizations["toascii"] = &ToAscii;
// Formatting and IO Optimizations

17
lib/Transforms/Utils/SimplifyLibCalls.cpp
View File

@ -1283,6 +1283,21 @@ struct IsDigitOpt : public LibCallOptimization {
}
};
struct IsAsciiOpt : public LibCallOptimization {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
!FT->getParamType(0)->isIntegerTy(32))
return 0;
// isascii(c) -> c <u 128
Value *Op = CI->getArgOperand(0);
Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
} // End anonymous namespace.
namespace llvm {
@ -1333,6 +1348,7 @@ class LibCallSimplifierImpl {
FFSOpt FFS;
AbsOpt Abs;
IsDigitOpt IsDigit;
IsAsciiOpt IsAscii;
void initOptimizations();
void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@ -1452,6 +1468,7 @@ void LibCallSimplifierImpl::initOptimizations() {
addOpt(LibFunc::labs, &Abs);
addOpt(LibFunc::llabs, &Abs);
addOpt(LibFunc::isdigit, &IsDigit);
addOpt(LibFunc::isascii, &IsAscii);
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {

32
test/Transforms/InstCombine/isascii-1.ll Normal file
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@ -0,0 +1,32 @@
; Test that the isascii library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
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"
declare i32 @isascii(i32)
; Check isascii(c) -> c <u 128.
define i32 @test_simplify1() {
; CHECK: @test_simplify1
%ret = call i32 @isascii(i32 127)
ret i32 %ret
; CHECK-NEXT: ret i32 1
}
define i32 @test_simplify2() {
; CHECK: @test_simplify2
%ret = call i32 @isascii(i32 128)
ret i32 %ret
; CHECK-NEXT: ret i32 0
}
define i32 @test_simplify3(i32 %x) {
; CHECK: @test_simplify3
%ret = call i32 @isascii(i32 %x)
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ult i32 %x, 128
; CHECK-NEXT: [[ZEXT:%[a-z0-9]+]] = zext i1 [[CMP]] to i32
ret i32 %ret
; CHECK-NEXT: ret i32 [[ZEXT]]
}