128 lines
6.7 KiB
C
128 lines
6.7 KiB
C
/// Check the code generation for the alignment builtins
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/// To make the test case easier to read, run SROA after generating IR to remove the alloca instructions.
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_VOID_PTR \
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// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
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// RUN: FileCheck %s -check-prefixes CHECK,POINTER,ALIGNMENT_EXT \
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// RUN: -enable-var-scope '-D$PTRTYPE=i8'
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_FLOAT_PTR \
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// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
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// RUN: FileCheck %s -check-prefixes CHECK,POINTER,NON_I8_POINTER,ALIGNMENT_EXT \
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// RUN: -enable-var-scope '-D$PTRTYPE=f32'
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_LONG \
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// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
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// RUN: FileCheck %s -check-prefixes CHECK,INTEGER,ALIGNMENT_EXT -enable-var-scope
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/// Check that we can handle the case where the alignment parameter is wider
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/// than the source type (generate a trunc on alignment instead of zext)
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_USHORT \
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// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
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// RUN: FileCheck %s -check-prefixes CHECK,INTEGER,ALIGNMENT_TRUNC -enable-var-scope
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#ifdef TEST_VOID_PTR
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#define TYPE void *
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#elif defined(TEST_FLOAT_PTR)
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#define TYPE float *
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#elif defined(TEST_LONG)
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#define TYPE long
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#elif defined(TEST_CAP)
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#define TYPE void *__capability
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#elif defined(TEST_USHORT)
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#define TYPE unsigned short
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#else
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#error MISSING TYPE
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#endif
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/// Check that constant initializers work and are correct
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_Bool aligned_true = __builtin_is_aligned(1024, 512);
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// CHECK: @aligned_true = global i8 1, align 1
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_Bool aligned_false = __builtin_is_aligned(123, 512);
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// CHECK: @aligned_false = global i8 0, align 1
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int down_1 = __builtin_align_down(1023, 32);
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// CHECK: @down_1 = global i32 992, align 4
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int down_2 = __builtin_align_down(256, 32);
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// CHECK: @down_2 = global i32 256, align 4
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int up_1 = __builtin_align_up(1023, 32);
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// CHECK: @up_1 = global i32 1024, align 4
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int up_2 = __builtin_align_up(256, 32);
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// CHECK: @up_2 = global i32 256, align 4
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/// Capture the IR type here to use in the remaining FileCheck captures:
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// CHECK: define {{[^@]+}}@get_type() #0
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// CHECK-NEXT: entry:
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// POINTER-NEXT: ret [[$TYPE:.+]] null
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// INTEGER-NEXT: ret [[$TYPE:.+]] 0
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//
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TYPE get_type(void) {
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return (TYPE)0;
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}
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// CHECK-LABEL: define {{[^@]+}}@is_aligned
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// CHECK-SAME: ([[$TYPE]] {{[^%]*}}[[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
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// CHECK-NEXT: entry:
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// ALIGNMENT_EXT-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to [[ALIGN_TYPE:i64]]
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// ALIGNMENT_TRUNC-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to [[ALIGN_TYPE:i16]]
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// CHECK-NEXT: [[MASK:%.*]] = sub [[ALIGN_TYPE]] [[ALIGNMENT]], 1
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// POINTER-NEXT: [[PTR:%.*]] = ptrtoint [[$TYPE]] %ptr to i64
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// CHECK-NEXT: [[SET_BITS:%.*]] = and [[ALIGN_TYPE]] [[PTR]], [[MASK]]
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// CHECK-NEXT: [[IS_ALIGNED:%.*]] = icmp eq [[ALIGN_TYPE]] [[SET_BITS]], 0
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// CHECK-NEXT: ret i1 [[IS_ALIGNED]]
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//
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_Bool is_aligned(TYPE ptr, unsigned align) {
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return __builtin_is_aligned(ptr, align);
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}
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// CHECK-LABEL: define {{[^@]+}}@align_up
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// CHECK-SAME: ([[$TYPE]] {{[^%]*}}[[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
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// CHECK-NEXT: entry:
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// ALIGNMENT_EXT-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to [[ALIGN_TYPE:i64]]
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// ALIGNMENT_TRUNC-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to [[ALIGN_TYPE:i16]]
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// CHECK-NEXT: [[MASK:%.*]] = sub [[ALIGN_TYPE]] [[ALIGNMENT]], 1
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// INTEGER-NEXT: [[OVER_BOUNDARY:%.*]] = add [[$TYPE]] [[PTR]], [[MASK]]
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// NOTYET-POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = call [[$TYPE]] @llvm.ptrmask.p0[[$PTRTYPE]].p0i8.i64(i8* [[OVER_BOUNDARY]], [[ALIGN_TYPE]] [[INVERTED_MASK]])
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// POINTER-NEXT: [[INTPTR:%.*]] = ptrtoint [[$TYPE]] [[PTR]] to [[ALIGN_TYPE]]
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// POINTER-NEXT: [[OVER_BOUNDARY:%.*]] = add [[ALIGN_TYPE]] [[INTPTR]], [[MASK]]
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// CHECK-NEXT: [[INVERTED_MASK:%.*]] = xor [[ALIGN_TYPE]] [[MASK]], -1
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// CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = and [[ALIGN_TYPE]] [[OVER_BOUNDARY]], [[INVERTED_MASK]]
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// POINTER-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_RESULT]], [[INTPTR]]
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// NON_I8_POINTER-NEXT: [[PTR:%.*]] = bitcast [[$TYPE]] {{%.*}} to i8*
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// POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[PTR]], i64 [[DIFF]]
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// NON_I8_POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = bitcast i8* {{%.*}} to [[$TYPE]]
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// POINTER-NEXT: [[ASSUME_MASK:%.*]] = sub i64 %alignment, 1
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// POINTER-NEXT: [[ASSUME_INTPTR:%.*]]= ptrtoint [[$TYPE]] [[ALIGNED_RESULT]] to i64
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// POINTER-NEXT: [[MASKEDPTR:%.*]] = and i64 %ptrint, [[ASSUME_MASK]]
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// POINTER-NEXT: [[MASKEDCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
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// POINTER-NEXT: call void @llvm.assume(i1 [[MASKEDCOND]])
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// CHECK-NEXT: ret [[$TYPE]] [[ALIGNED_RESULT]]
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//
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TYPE align_up(TYPE ptr, unsigned align) {
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return __builtin_align_up(ptr, align);
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}
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// CHECK-LABEL: define {{[^@]+}}@align_down
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// CHECK-SAME: ([[$TYPE]] {{[^%]*}}[[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
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// CHECK-NEXT: entry:
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// ALIGNMENT_EXT-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to [[ALIGN_TYPE:i64]]
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// ALIGNMENT_TRUNC-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to [[ALIGN_TYPE:i16]]
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// CHECK-NEXT: [[MASK:%.*]] = sub [[ALIGN_TYPE]] [[ALIGNMENT]], 1
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// NOTYET-POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = call [[$TYPE]] @llvm.ptrmask.p0[[$PTRTYPE]].p0[[$PTRTYPE]].i64([[$TYPE]] [[PTR]], [[ALIGN_TYPE]] [[INVERTED_MASK]])
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// POINTER-NEXT: [[INTPTR:%.*]] = ptrtoint [[$TYPE]] [[PTR]] to [[ALIGN_TYPE]]
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// CHECK-NEXT: [[INVERTED_MASK:%.*]] = xor [[ALIGN_TYPE]] [[MASK]], -1
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// POINTER-NEXT: [[ALIGNED_INTPTR:%.*]] = and [[ALIGN_TYPE]] [[INTPTR]], [[INVERTED_MASK]]
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// POINTER-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
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// NON_I8_POINTER-NEXT: [[PTR:%.*]] = bitcast [[$TYPE]] {{%.*}} to i8*
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// POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[PTR]], i64 [[DIFF]]
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// NON_I8_POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = bitcast i8* {{%.*}} to [[$TYPE]]
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// INTEGER-NEXT: [[ALIGNED_RESULT:%.*]] = and [[ALIGN_TYPE]] [[PTR]], [[INVERTED_MASK]]
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// POINTER-NEXT: [[ASSUME_MASK:%.*]] = sub i64 %alignment, 1
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// POINTER-NEXT: [[ASSUME_INTPTR:%.*]]= ptrtoint [[$TYPE]] [[ALIGNED_RESULT]] to i64
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// POINTER-NEXT: [[MASKEDPTR:%.*]] = and i64 %ptrint, [[ASSUME_MASK]]
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// POINTER-NEXT: [[MASKEDCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
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// POINTER-NEXT: call void @llvm.assume(i1 [[MASKEDCOND]])
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// CHECK-NEXT: ret [[$TYPE]] [[ALIGNED_RESULT]]
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//
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TYPE align_down(TYPE ptr, unsigned align) {
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return __builtin_align_down(ptr, align);
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}
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