78de7297ab
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.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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void *my_aligned_alloc(int size, int alignment) __attribute__((assume_aligned(32), alloc_align(2)));
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// CHECK-LABEL: @t0_immediate0(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[CALL:%.*]] = call align 32 i8* @my_aligned_alloc(i32 320, i32 16)
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// CHECK-NEXT: ret i8* [[CALL]]
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//
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void *t0_immediate0() {
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return my_aligned_alloc(320, 16);
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};
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// CHECK-LABEL: @t1_immediate1(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[CALL:%.*]] = call align 32 i8* @my_aligned_alloc(i32 320, i32 32)
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// CHECK-NEXT: ret i8* [[CALL]]
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//
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void *t1_immediate1() {
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return my_aligned_alloc(320, 32);
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};
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// CHECK-LABEL: @t2_immediate2(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[CALL:%.*]] = call align 64 i8* @my_aligned_alloc(i32 320, i32 64)
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// CHECK-NEXT: ret i8* [[CALL]]
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//
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void *t2_immediate2() {
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return my_aligned_alloc(320, 64);
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};
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// CHECK-LABEL: @t3_variable(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[ALIGNMENT_ADDR:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store i32 [[ALIGNMENT:%.*]], i32* [[ALIGNMENT_ADDR]], align 4
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ALIGNMENT_ADDR]], align 4
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// CHECK-NEXT: [[CALL:%.*]] = call align 32 i8* @my_aligned_alloc(i32 320, i32 [[TMP0]])
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// CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
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// CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(i8* [[CALL]], i64 [[TMP1]]) ]
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// CHECK-NEXT: ret i8* [[CALL]]
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//
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void *t3_variable(int alignment) {
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return my_aligned_alloc(320, alignment);
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};
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