6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-13 04:30:23 +00:00
Code Issues Projects Releases Wiki Activity

make instcombine only rewrite a chain of computation

Browse Source 
(eliminating some extends) if the new type of the
computation is legal or if both the source and dest
are illegal.  This prevents instcombine from changing big
chains of computation into i64 on 32-bit targets for 
example.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-07 19:11:46 +00:00
parent 59a9178fbe
commit 918871ee01
6 changed files with 15 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -8289,23 +8289,6 @@ Instruction *InstCombiner::commonPointerCastTransforms(CastInst &CI) {
return commonCastTransforms(CI);
}
/// isSafeIntegerType - Return true if this is a basic integer type, not a crazy
/// type like i42. We don't want to introduce operations on random non-legal
/// integer types where they don't already exist in the code. In the future,
/// we should consider making this based off target-data, so that 32-bit targets
/// won't get i64 operations etc.
static bool isSafeIntegerType(const Type *Ty) {
switch (Ty->getPrimitiveSizeInBits()) {
case 8:
case 16:
case 32:
case 64:
return true;
default:
return false;
}
}
/// commonIntCastTransforms - This function implements the common transforms
/// for trunc, zext, and sext.
Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
@ -8334,8 +8317,10 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
// Only do this if the dest type is a simple type, don't convert the
// expression tree to something weird like i93 unless the source is also
// strange.
if ((isSafeIntegerType(DestTy->getScalarType()) ||
!isSafeIntegerType(SrcI->getType()->getScalarType())) &&
if (TD &&
(TD->isLegalInteger(DestTy->getScalarType()->getPrimitiveSizeInBits()) ||
!TD->isLegalInteger((SrcI->getType()->getScalarType()
->getPrimitiveSizeInBits()))) &&
CanEvaluateInDifferentType(SrcI, DestTy,
CI.getOpcode(), NumCastsRemoved)) {
// If this cast is a truncate, evaluting in a different type always
@ -8356,6 +8341,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
break;
case Instruction::ZExt: {
DoXForm = NumCastsRemoved >= 1;
if (!DoXForm && 0) {
// If it's unnecessary to issue an AND to clear the high bits, it's
// always profitable to do this xform.

2
test/Transforms/InstCombine/2008-01-21-MulTrunc.ll
View File

@ -1,5 +1,7 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
define i16 @test1(i16 %a) {
%tmp = zext i16 %a to i32 ; <i32> [#uses=2]
%tmp21 = lshr i32 %tmp, 8 ; <i32> [#uses=1]

2
test/Transforms/InstCombine/apint-cast.ll
View File

@ -1,6 +1,8 @@
; Tests to make sure elimination of casts is working correctly
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
define i17 @test1(i17 %a) {
%tmp = zext i17 %a to i37 ; <i37> [#uses=2]
%tmp21 = lshr i37 %tmp, 8 ; <i37> [#uses=1]

2
test/Transforms/InstCombine/cast-mul-select.ll
View File

@ -1,5 +1,7 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
define i32 @mul(i32 %x, i32 %y) {
%A = trunc i32 %x to i8
%B = trunc i32 %y to i8

2
test/Transforms/InstCombine/cast-set.ll
View File

@ -1,6 +1,8 @@
; This tests for various complex cast elimination cases instcombine should
; handle.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
; RUN: opt < %s -instcombine -S | FileCheck %s
define i1 @test1(i32 %X) {

2
test/Transforms/InstCombine/udivrem-change-width.ll
View File

@ -1,6 +1,8 @@
; RUN: opt < %s -instcombine -S | not grep zext
; PR4548
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
define i8 @udiv_i8(i8 %a, i8 %b) nounwind {
%conv = zext i8 %a to i32
%conv2 = zext i8 %b to i32