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llvm-project/clang/test/CodeGen/builtin-align.c
Tyker 78de7297ab Reland [AssumeBundles] Use operand bundles to encode alignment assumptions 
NOTE: There is a mailing list discussion on this: http://lists.llvm.org/pipermail/llvm-dev/2019-December/137632.html

Complemantary to the assumption outliner prototype in D71692, this patch
shows how we could simplify the code emitted for an alignemnt
assumption. The generated code is smaller, less fragile, and it makes it
easier to recognize the additional use as a "assumption use".

As mentioned in D71692 and on the mailing list, we could adopt this
scheme, and similar schemes for other patterns, without adopting the
assumption outlining.
2020-09-12 15:36:06 +02:00

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// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
/// Check the code generation for the alignment builtins
/// To make the test case easier to read, run SROA after generating IR to remove the alloca instructions.
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_VOID_PTR \
// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
// RUN: FileCheck %s -check-prefixes CHECK,CHECK-VOID_PTR \
// RUN: -enable-var-scope '-D$PTRTYPE=i8'
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_FLOAT_PTR \
// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
// RUN: FileCheck %s -check-prefixes CHECK,CHECK-FLOAT_PTR \
// RUN: -enable-var-scope '-D$PTRTYPE=f32'
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_LONG \
// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
// RUN: FileCheck %s -check-prefixes CHECK,CHECK-LONG -enable-var-scope
/// Check that we can handle the case where the alignment parameter is wider
/// than the source type (generate a trunc on alignment instead of zext)
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -DTEST_USHORT \
// RUN: -o - -emit-llvm %s -disable-O0-optnone | opt -S -sroa | \
// RUN: FileCheck %s -check-prefixes CHECK,CHECK-USHORT -enable-var-scope
#ifdef TEST_VOID_PTR
#define TYPE void *
#elif defined(TEST_FLOAT_PTR)
#define TYPE float *
#elif defined(TEST_LONG)
#define TYPE long
#elif defined(TEST_USHORT)
#define TYPE unsigned short
#else
#error MISSING TYPE
#endif
/// Check that constant initializers work and are correct
_Bool aligned_true = __builtin_is_aligned(1024, 512);
// CHECK: @aligned_true = global i8 1, align 1
_Bool aligned_false = __builtin_is_aligned(123, 512);
// CHECK: @aligned_false = global i8 0, align 1
int down_1 = __builtin_align_down(1023, 32);
// CHECK: @down_1 = global i32 992, align 4
int down_2 = __builtin_align_down(256, 32);
// CHECK: @down_2 = global i32 256, align 4
int up_1 = __builtin_align_up(1023, 32);
// CHECK: @up_1 = global i32 1024, align 4
int up_2 = __builtin_align_up(256, 32);
// CHECK: @up_2 = global i32 256, align 4
/// Capture the IR type here to use in the remaining FileCheck captures:
// CHECK-VOID_PTR-LABEL: define {{[^@]+}}@get_type() #0
// CHECK-VOID_PTR-NEXT: entry:
// CHECK-VOID_PTR-NEXT: ret i8* null
//
// CHECK-FLOAT_PTR-LABEL: define {{[^@]+}}@get_type() #0
// CHECK-FLOAT_PTR-NEXT: entry:
// CHECK-FLOAT_PTR-NEXT: ret float* null
//
// CHECK-LONG-LABEL: define {{[^@]+}}@get_type() #0
// CHECK-LONG-NEXT: entry:
// CHECK-LONG-NEXT: ret i64 0
//
// CHECK-USHORT-LABEL: define {{[^@]+}}@get_type() #0
// CHECK-USHORT-NEXT: entry:
// CHECK-USHORT-NEXT: ret i16 0
//
TYPE get_type(void) {
return (TYPE)0;
}
// CHECK-VOID_PTR-LABEL: define {{[^@]+}}@is_aligned
// CHECK-VOID_PTR-SAME: (i8* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-VOID_PTR-NEXT: entry:
// CHECK-VOID_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-VOID_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-VOID_PTR-NEXT: [[SRC_ADDR:%.*]] = ptrtoint i8* [[PTR]] to i64
// CHECK-VOID_PTR-NEXT: [[SET_BITS:%.*]] = and i64 [[SRC_ADDR]], [[MASK]]
// CHECK-VOID_PTR-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 0
// CHECK-VOID_PTR-NEXT: ret i1 [[IS_ALIGNED]]
//
// CHECK-FLOAT_PTR-LABEL: define {{[^@]+}}@is_aligned
// CHECK-FLOAT_PTR-SAME: (float* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-FLOAT_PTR-NEXT: entry:
// CHECK-FLOAT_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-FLOAT_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-FLOAT_PTR-NEXT: [[SRC_ADDR:%.*]] = ptrtoint float* [[PTR]] to i64
// CHECK-FLOAT_PTR-NEXT: [[SET_BITS:%.*]] = and i64 [[SRC_ADDR]], [[MASK]]
// CHECK-FLOAT_PTR-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 0
// CHECK-FLOAT_PTR-NEXT: ret i1 [[IS_ALIGNED]]
//
// CHECK-LONG-LABEL: define {{[^@]+}}@is_aligned
// CHECK-LONG-SAME: (i64 [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-LONG-NEXT: entry:
// CHECK-LONG-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-LONG-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-LONG-NEXT: [[SET_BITS:%.*]] = and i64 [[PTR]], [[MASK]]
// CHECK-LONG-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 0
// CHECK-LONG-NEXT: ret i1 [[IS_ALIGNED]]
//
// CHECK-USHORT-LABEL: define {{[^@]+}}@is_aligned
// CHECK-USHORT-SAME: (i16 zeroext [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-USHORT-NEXT: entry:
// CHECK-USHORT-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to i16
// CHECK-USHORT-NEXT: [[MASK:%.*]] = sub i16 [[ALIGNMENT]], 1
// CHECK-USHORT-NEXT: [[SET_BITS:%.*]] = and i16 [[PTR]], [[MASK]]
// CHECK-USHORT-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i16 [[SET_BITS]], 0
// CHECK-USHORT-NEXT: ret i1 [[IS_ALIGNED]]
//
_Bool is_aligned(TYPE ptr, unsigned align) {
return __builtin_is_aligned(ptr, align);
}
// NOTYET-POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = call [[$TYPE]] @llvm.ptrmask.p0[[$PTRTYPE]].p0i8.i64(i8* [[OVER_BOUNDARY]], [[ALIGN_TYPE]] [[INVERTED_MASK]])
// CHECK-VOID_PTR-LABEL: define {{[^@]+}}@align_up
// CHECK-VOID_PTR-SAME: (i8* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-VOID_PTR-NEXT: entry:
// CHECK-VOID_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-VOID_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-VOID_PTR-NEXT: [[INTPTR:%.*]] = ptrtoint i8* [[PTR]] to i64
// CHECK-VOID_PTR-NEXT: [[OVER_BOUNDARY:%.*]] = add i64 [[INTPTR]], [[MASK]]
// CHECK-VOID_PTR-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-VOID_PTR-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[OVER_BOUNDARY]], [[INVERTED_MASK]]
// CHECK-VOID_PTR-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
// CHECK-VOID_PTR-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[PTR]], i64 [[DIFF]]
// CHECK-VOID_PTR-NEXT: call void @llvm.assume(i1 true) [ "align"(i8* [[ALIGNED_RESULT]], i64 [[ALIGNMENT]]) ]
// CHECK-VOID_PTR-NEXT: ret i8* [[ALIGNED_RESULT]]
//
// CHECK-FLOAT_PTR-LABEL: define {{[^@]+}}@align_up
// CHECK-FLOAT_PTR-SAME: (float* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-FLOAT_PTR-NEXT: entry:
// CHECK-FLOAT_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-FLOAT_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-FLOAT_PTR-NEXT: [[INTPTR:%.*]] = ptrtoint float* [[PTR]] to i64
// CHECK-FLOAT_PTR-NEXT: [[OVER_BOUNDARY:%.*]] = add i64 [[INTPTR]], [[MASK]]
// CHECK-FLOAT_PTR-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-FLOAT_PTR-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[OVER_BOUNDARY]], [[INVERTED_MASK]]
// CHECK-FLOAT_PTR-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
// CHECK-FLOAT_PTR-NEXT: [[TMP0:%.*]] = bitcast float* [[PTR]] to i8*
// CHECK-FLOAT_PTR-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[TMP0]], i64 [[DIFF]]
// CHECK-FLOAT_PTR-NEXT: [[TMP1:%.*]] = bitcast i8* [[ALIGNED_RESULT]] to float*
// CHECK-FLOAT_PTR-NEXT: call void @llvm.assume(i1 true) [ "align"(float* [[TMP1]], i64 [[ALIGNMENT]]) ]
// CHECK-FLOAT_PTR-NEXT: ret float* [[TMP1]]
//
// CHECK-LONG-LABEL: define {{[^@]+}}@align_up
// CHECK-LONG-SAME: (i64 [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-LONG-NEXT: entry:
// CHECK-LONG-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-LONG-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-LONG-NEXT: [[OVER_BOUNDARY:%.*]] = add i64 [[PTR]], [[MASK]]
// CHECK-LONG-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-LONG-NEXT: [[ALIGNED_RESULT:%.*]] = and i64 [[OVER_BOUNDARY]], [[INVERTED_MASK]]
// CHECK-LONG-NEXT: ret i64 [[ALIGNED_RESULT]]
//
// CHECK-USHORT-LABEL: define {{[^@]+}}@align_up
// CHECK-USHORT-SAME: (i16 zeroext [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-USHORT-NEXT: entry:
// CHECK-USHORT-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to i16
// CHECK-USHORT-NEXT: [[MASK:%.*]] = sub i16 [[ALIGNMENT]], 1
// CHECK-USHORT-NEXT: [[OVER_BOUNDARY:%.*]] = add i16 [[PTR]], [[MASK]]
// CHECK-USHORT-NEXT: [[INVERTED_MASK:%.*]] = xor i16 [[MASK]], -1
// CHECK-USHORT-NEXT: [[ALIGNED_RESULT:%.*]] = and i16 [[OVER_BOUNDARY]], [[INVERTED_MASK]]
// CHECK-USHORT-NEXT: ret i16 [[ALIGNED_RESULT]]
//
TYPE align_up(TYPE ptr, unsigned align) {
return __builtin_align_up(ptr, align);
}
// NOTYET-POINTER-NEXT: [[ALIGNED_RESULT:%.*]] = call [[$TYPE]] @llvm.ptrmask.p0[[$PTRTYPE]].p0[[$PTRTYPE]].i64([[$TYPE]] [[PTR]], [[ALIGN_TYPE]] [[INVERTED_MASK]])
// CHECK-VOID_PTR-LABEL: define {{[^@]+}}@align_down
// CHECK-VOID_PTR-SAME: (i8* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-VOID_PTR-NEXT: entry:
// CHECK-VOID_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-VOID_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-VOID_PTR-NEXT: [[INTPTR:%.*]] = ptrtoint i8* [[PTR]] to i64
// CHECK-VOID_PTR-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-VOID_PTR-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[INTPTR]], [[INVERTED_MASK]]
// CHECK-VOID_PTR-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
// CHECK-VOID_PTR-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[PTR]], i64 [[DIFF]]
// CHECK-VOID_PTR-NEXT: call void @llvm.assume(i1 true) [ "align"(i8* [[ALIGNED_RESULT]], i64 [[ALIGNMENT]]) ]
// CHECK-VOID_PTR-NEXT: ret i8* [[ALIGNED_RESULT]]
//
// CHECK-FLOAT_PTR-LABEL: define {{[^@]+}}@align_down
// CHECK-FLOAT_PTR-SAME: (float* [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-FLOAT_PTR-NEXT: entry:
// CHECK-FLOAT_PTR-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-FLOAT_PTR-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-FLOAT_PTR-NEXT: [[INTPTR:%.*]] = ptrtoint float* [[PTR]] to i64
// CHECK-FLOAT_PTR-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-FLOAT_PTR-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[INTPTR]], [[INVERTED_MASK]]
// CHECK-FLOAT_PTR-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
// CHECK-FLOAT_PTR-NEXT: [[TMP0:%.*]] = bitcast float* [[PTR]] to i8*
// CHECK-FLOAT_PTR-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[TMP0]], i64 [[DIFF]]
// CHECK-FLOAT_PTR-NEXT: [[TMP1:%.*]] = bitcast i8* [[ALIGNED_RESULT]] to float*
// CHECK-FLOAT_PTR-NEXT: call void @llvm.assume(i1 true) [ "align"(float* [[TMP1]], i64 [[ALIGNMENT]]) ]
// CHECK-FLOAT_PTR-NEXT: ret float* [[TMP1]]
//
// CHECK-LONG-LABEL: define {{[^@]+}}@align_down
// CHECK-LONG-SAME: (i64 [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-LONG-NEXT: entry:
// CHECK-LONG-NEXT: [[ALIGNMENT:%.*]] = zext i32 [[ALIGN]] to i64
// CHECK-LONG-NEXT: [[MASK:%.*]] = sub i64 [[ALIGNMENT]], 1
// CHECK-LONG-NEXT: [[INVERTED_MASK:%.*]] = xor i64 [[MASK]], -1
// CHECK-LONG-NEXT: [[ALIGNED_RESULT:%.*]] = and i64 [[PTR]], [[INVERTED_MASK]]
// CHECK-LONG-NEXT: ret i64 [[ALIGNED_RESULT]]
//
// CHECK-USHORT-LABEL: define {{[^@]+}}@align_down
// CHECK-USHORT-SAME: (i16 zeroext [[PTR:%.*]], i32 [[ALIGN:%.*]]) #0
// CHECK-USHORT-NEXT: entry:
// CHECK-USHORT-NEXT: [[ALIGNMENT:%.*]] = trunc i32 [[ALIGN]] to i16
// CHECK-USHORT-NEXT: [[MASK:%.*]] = sub i16 [[ALIGNMENT]], 1
// CHECK-USHORT-NEXT: [[INVERTED_MASK:%.*]] = xor i16 [[MASK]], -1
// CHECK-USHORT-NEXT: [[ALIGNED_RESULT:%.*]] = and i16 [[PTR]], [[INVERTED_MASK]]
// CHECK-USHORT-NEXT: ret i16 [[ALIGNED_RESULT]]
//
TYPE align_down(TYPE ptr, unsigned align) {
return __builtin_align_down(ptr, align);
}
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