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Canonicalize sizeof and alignof on pointer types to a canonical 

pointer type.

llvm-svn: 95769
This commit is contained in:
Dan Gohman 2010-02-10 06:13:07 +00:00
parent e69b99baaf
commit 183a423af9
2 changed files with 70 additions and 7 deletions
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19
llvm/lib/VMCore/ConstantFold.cpp
View File

@ -361,6 +361,15 @@ static Constant *getFoldedSizeOf(const Type *Ty, const Type *DestTy,
}
}
// Pointer size doesn't depend on the pointee type, so canonicalize them
// to an arbitrary pointee.
if (const PointerType *PTy = dyn_cast<PointerType>(Ty))
if (!PTy->getElementType()->isInteger(1))
return
getFoldedSizeOf(PointerType::get(IntegerType::get(PTy->getContext(), 1),
PTy->getAddressSpace()),
DestTy, true);
// If there's no interesting folding happening, bail so that we don't create
// a constant that looks like it needs folding but really doesn't.
if (!Folded)
@ -417,6 +426,16 @@ static Constant *getFoldedAlignOf(const Type *Ty, const Type *DestTy,
return MemberAlign;
}
// Pointer alignment doesn't depend on the pointee type, so canonicalize them
// to an arbitrary pointee.
if (const PointerType *PTy = dyn_cast<PointerType>(Ty))
if (!PTy->getElementType()->isInteger(1))
return
getFoldedAlignOf(PointerType::get(IntegerType::get(PTy->getContext(),
1),
PTy->getAddressSpace()),
DestTy, true);
// If there's no interesting folding happening, bail so that we don't create
// a constant that looks like it needs folding but really doesn't.
if (!Folded)

58
llvm/test/Other/constant-fold-gep.ll
View File

@ -19,10 +19,12 @@
; PLAIN: %0 = type { i1, double }
; PLAIN: %1 = type { double, float, double, double }
; PLAIN: %2 = type { i64, i64 }
; PLAIN: %2 = type { i1, i1* }
; PLAIN: %3 = type { i64, i64 }
; OPT: %0 = type { i1, double }
; OPT: %1 = type { double, float, double, double }
; OPT: %2 = type { i64, i64 }
; OPT: %2 = type { i1, i1* }
; OPT: %3 = type { i64, i64 }
; The automatic constant folder in opt does not have targetdata access, so
; it can't fold gep arithmetic, in general. However, the constant folder run
@ -65,6 +67,8 @@
; PLAIN: @e = constant i64 ptrtoint (double* getelementptr (%1* null, i64 0, i32 2) to i64)
; PLAIN: @f = constant i64 1
; PLAIN: @g = constant i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; PLAIN: @h = constant i64 ptrtoint (i1** getelementptr (i1** null, i32 1) to i64)
; PLAIN: @i = constant i64 ptrtoint (i1** getelementptr (%2* null, i64 0, i32 1) to i64)
; OPT: @a = constant i64 mul (i64 ptrtoint (double* getelementptr (double* null, i32 1) to i64), i64 2310)
; OPT: @b = constant i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; OPT: @c = constant i64 mul (i64 ptrtoint (double* getelementptr (double* null, i32 1) to i64), i64 2)
@ -72,6 +76,8 @@
; OPT: @e = constant i64 ptrtoint (double* getelementptr (%1* null, i64 0, i32 2) to i64)
; OPT: @f = constant i64 1
; OPT: @g = constant i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; OPT: @h = constant i64 ptrtoint (i1** getelementptr (i1** null, i32 1) to i64)
; OPT: @i = constant i64 ptrtoint (i1** getelementptr (%2* null, i64 0, i32 1) to i64)
; TO: @a = constant i64 18480
; TO: @b = constant i64 8
; TO: @c = constant i64 16
@ -79,6 +85,8 @@
; TO: @e = constant i64 16
; TO: @f = constant i64 1
; TO: @g = constant i64 8
; TO: @h = constant i64 8
; TO: @i = constant i64 8
@a = constant i64 mul (i64 3, i64 mul (i64 ptrtoint ({[7 x double], [7 x double]}* getelementptr ({[7 x double], [7 x double]}* null, i64 11) to i64), i64 5))
@b = constant i64 ptrtoint ([13 x double]* getelementptr ({i1, [13 x double]}* null, i64 0, i32 1) to i64)
@ -87,14 +95,16 @@
@e = constant i64 ptrtoint (double* getelementptr ({double, float, double, double}* null, i64 0, i32 2) to i64)
@f = constant i64 ptrtoint (<{ i16, i128 }>* getelementptr ({i1, <{ i16, i128 }>}* null, i64 0, i32 1) to i64)
@g = constant i64 ptrtoint ({double, double}* getelementptr ({i1, {double, double}}* null, i64 0, i32 1) to i64)
@h = constant i64 ptrtoint (double** getelementptr (double** null, i64 1) to i64)
@i = constant i64 ptrtoint (double** getelementptr ({i1, double*}* null, i64 0, i32 1) to i64)
; The target-dependent folder should cast GEP indices to integer-sized pointers.
; PLAIN: @M = constant i64* getelementptr (i64* null, i32 1)
; PLAIN: @N = constant i64* getelementptr (%2* null, i32 0, i32 1)
; PLAIN: @N = constant i64* getelementptr (%3* null, i32 0, i32 1)
; PLAIN: @O = constant i64* getelementptr ([2 x i64]* null, i32 0, i32 1)
; OPT: @M = constant i64* getelementptr (i64* null, i32 1)
; OPT: @N = constant i64* getelementptr (%2* null, i32 0, i32 1)
; OPT: @N = constant i64* getelementptr (%3* null, i32 0, i32 1)
; OPT: @O = constant i64* getelementptr ([2 x i64]* null, i32 0, i32 1)
; TO: @M = constant i64* inttoptr (i64 8 to i64*)
; TO: @N = constant i64* inttoptr (i64 8 to i64*)
@ -237,6 +247,14 @@ define i1* @hoo1() nounwind {
; PLAIN: %t = bitcast i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; PLAIN: ret i64 %t
; PLAIN: }
; PLAIN: define i64 @fh() nounwind {
; PLAIN: %t = bitcast i64 ptrtoint (i1** getelementptr (i1** null, i32 1) to i64)
; PLAIN: ret i64 %t
; PLAIN: }
; PLAIN: define i64 @fi() nounwind {
; PLAIN: %t = bitcast i64 ptrtoint (i1** getelementptr (%2* null, i64 0, i32 1) to i64)
; PLAIN: ret i64 %t
; PLAIN: }
; OPT: define i64 @fa() nounwind {
; OPT: ret i64 mul (i64 ptrtoint (double* getelementptr (double* null, i32 1) to i64), i64 2310)
; OPT: }
@ -258,6 +276,12 @@ define i1* @hoo1() nounwind {
; OPT: define i64 @fg() nounwind {
; OPT: ret i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; OPT: }
; OPT: define i64 @fh() nounwind {
; OPT: ret i64 ptrtoint (i1** getelementptr (i1** null, i32 1) to i64)
; OPT: }
; OPT: define i64 @fi() nounwind {
; OPT: ret i64 ptrtoint (i1** getelementptr (%2* null, i64 0, i32 1) to i64)
; OPT: }
; TO: define i64 @fa() nounwind {
; TO: ret i64 18480
; TO: }
@ -279,6 +303,12 @@ define i1* @hoo1() nounwind {
; TO: define i64 @fg() nounwind {
; TO: ret i64 8
; TO: }
; TO: define i64 @fh() nounwind {
; TO: ret i64 8
; TO: }
; TO: define i64 @fi() nounwind {
; TO: ret i64 8
; TO: }
; SCEV: Classifying expressions for: @fa
; SCEV: %t = bitcast i64 mul (i64 ptrtoint (double* getelementptr (double* null, i32 1) to i64), i64 2310) to i64
; SCEV: --> (2310 * sizeof(double))
@ -300,6 +330,12 @@ define i1* @hoo1() nounwind {
; SCEV: Classifying expressions for: @fg
; SCEV: %t = bitcast i64 ptrtoint (double* getelementptr (%0* null, i64 0, i32 1) to i64)
; SCEV: --> alignof(double)
; SCEV: Classifying expressions for: @fh
; SCEV: %t = bitcast i64 ptrtoint (i1** getelementptr (i1** null, i32 1) to i64)
; SCEV: --> sizeof(i1*)
; SCEV: Classifying expressions for: @fi
; SCEV: %t = bitcast i64 ptrtoint (i1** getelementptr (%2* null, i64 0, i32 1) to i64)
; SCEV: --> alignof(i1*)
define i64 @fa() nounwind {
%t = bitcast i64 mul (i64 3, i64 mul (i64 ptrtoint ({[7 x double], [7 x double]}* getelementptr ({[7 x double], [7 x double]}* null, i64 11) to i64), i64 5)) to i64
@ -329,13 +365,21 @@ define i64 @fg() nounwind {
%t = bitcast i64 ptrtoint ({double, double}* getelementptr ({i1, {double, double}}* null, i64 0, i32 1) to i64) to i64
ret i64 %t
}
define i64 @fh() nounwind {
%t = bitcast i64 ptrtoint (double** getelementptr (double** null, i32 1) to i64) to i64
ret i64 %t
}
define i64 @fi() nounwind {
%t = bitcast i64 ptrtoint (double** getelementptr ({i1, double*}* null, i64 0, i32 1) to i64) to i64
ret i64 %t
}
; PLAIN: define i64* @fM() nounwind {
; PLAIN: %t = bitcast i64* getelementptr (i64* null, i32 1) to i64*
; PLAIN: ret i64* %t
; PLAIN: }
; PLAIN: define i64* @fN() nounwind {
; PLAIN: %t = bitcast i64* getelementptr (%2* null, i32 0, i32 1) to i64*
; PLAIN: %t = bitcast i64* getelementptr (%3* null, i32 0, i32 1) to i64*
; PLAIN: ret i64* %t
; PLAIN: }
; PLAIN: define i64* @fO() nounwind {
@ -346,7 +390,7 @@ define i64 @fg() nounwind {
; OPT: ret i64* getelementptr (i64* null, i32 1)
; OPT: }
; OPT: define i64* @fN() nounwind {
; OPT: ret i64* getelementptr (%2* null, i32 0, i32 1)
; OPT: ret i64* getelementptr (%3* null, i32 0, i32 1)
; OPT: }
; OPT: define i64* @fO() nounwind {
; OPT: ret i64* getelementptr ([2 x i64]* null, i32 0, i32 1)
@ -364,7 +408,7 @@ define i64 @fg() nounwind {
; SCEV: %t = bitcast i64* getelementptr (i64* null, i32 1) to i64*
; SCEV: --> sizeof(i64)
; SCEV: Classifying expressions for: @fN
; SCEV: %t = bitcast i64* getelementptr (%2* null, i32 0, i32 1) to i64*
; SCEV: %t = bitcast i64* getelementptr (%3* null, i32 0, i32 1) to i64*
; SCEV: --> sizeof(i64)
; SCEV: Classifying expressions for: @fO
; SCEV: %t = bitcast i64* getelementptr ([2 x i64]* null, i32 0, i32 1) to i64*