7ea46aee36
Assume bundle can have more than one entry with the same name,
but at least AlignmentFromAssumptionsPass::extractAlignmentInfo() uses
getOperandBundle("align"), which internally assumes that it isn't the
case, and happily crashes otherwise.
Minimal reduced reproducer: run `opt -alignment-from-assumptions` on
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%0 = type { i64, %1*, i8*, i64, %2, i32, %3*, i8* }
%1 = type opaque
%2 = type { i8, i8, i16 }
%3 = type { i32, i32, i32, i32 }
; Function Attrs: nounwind
define i32 @f(%0* noalias nocapture readonly %arg, %0* noalias %arg1) local_unnamed_addr #0 {
bb:
call void @llvm.assume(i1 true) [ "align"(%0* %arg, i64 8), "align"(%0* %arg1, i64 8) ]
ret i32 0
}
; Function Attrs: nounwind willreturn
declare void @llvm.assume(i1) #1
attributes #0 = { nounwind "reciprocal-estimates"="none" }
attributes #1 = { nounwind willreturn }
This is what we'd have with -mllvm -enable-knowledge-retention
This reverts commit c95ffadb2474a4d8c4f598d94d35a9f31d9606cb.
79 lines
4.6 KiB
C
79 lines
4.6 KiB
C
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
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/// Check that the alignment builtins handle array-to-pointer decay
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -o - -emit-llvm %s | FileCheck %s
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extern int func(char *c);
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// CHECK-LABEL: define {{[^@]+}}@test_array() #0
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 16
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// CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], [1024 x i8]* [[BUF]], i64 0, i64 44
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// CHECK-NEXT: [[INTPTR:%.*]] = ptrtoint i8* [[ARRAYIDX]] to i64
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// CHECK-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[INTPTR]], -16
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// CHECK-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
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// CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[ARRAYIDX]], i64 [[DIFF]]
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// CHECK-NEXT: [[PTRINT:%.*]] = ptrtoint i8* [[ALIGNED_RESULT]] to i64
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// CHECK-NEXT: [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 15
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// CHECK-NEXT: [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
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// CHECK-NEXT: call void @llvm.assume(i1 [[MASKCOND]])
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// CHECK-NEXT: [[CALL:%.*]] = call i32 @func(i8* [[ALIGNED_RESULT]])
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// CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], [1024 x i8]* [[BUF]], i64 0, i64 22
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// CHECK-NEXT: [[INTPTR2:%.*]] = ptrtoint i8* [[ARRAYIDX1]] to i64
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// CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = add i64 [[INTPTR2]], 31
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// CHECK-NEXT: [[ALIGNED_INTPTR4:%.*]] = and i64 [[OVER_BOUNDARY]], -32
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// CHECK-NEXT: [[DIFF5:%.*]] = sub i64 [[ALIGNED_INTPTR4]], [[INTPTR2]]
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// CHECK-NEXT: [[ALIGNED_RESULT6:%.*]] = getelementptr inbounds i8, i8* [[ARRAYIDX1]], i64 [[DIFF5]]
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// CHECK-NEXT: [[PTRINT7:%.*]] = ptrtoint i8* [[ALIGNED_RESULT6]] to i64
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// CHECK-NEXT: [[MASKEDPTR8:%.*]] = and i64 [[PTRINT7]], 31
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// CHECK-NEXT: [[MASKCOND9:%.*]] = icmp eq i64 [[MASKEDPTR8]], 0
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// CHECK-NEXT: call void @llvm.assume(i1 [[MASKCOND9]])
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// CHECK-NEXT: [[CALL10:%.*]] = call i32 @func(i8* [[ALIGNED_RESULT6]])
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// CHECK-NEXT: [[ARRAYIDX11:%.*]] = getelementptr inbounds [1024 x i8], [1024 x i8]* [[BUF]], i64 0, i64 16
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// CHECK-NEXT: [[SRC_ADDR:%.*]] = ptrtoint i8* [[ARRAYIDX11]] to i64
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// CHECK-NEXT: [[SET_BITS:%.*]] = and i64 [[SRC_ADDR]], 63
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// CHECK-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 0
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// CHECK-NEXT: [[CONV:%.*]] = zext i1 [[IS_ALIGNED]] to i32
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// CHECK-NEXT: ret i32 [[CONV]]
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//
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int test_array(void) {
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char buf[1024];
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func(__builtin_align_down(&buf[44], 16));
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func(__builtin_align_up(&buf[22], 32));
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return __builtin_is_aligned(&buf[16], 64);
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}
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// CHECK-LABEL: define {{[^@]+}}@test_array_should_not_mask() #0
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 32
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// CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], [1024 x i8]* [[BUF]], i64 0, i64 64
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// CHECK-NEXT: [[INTPTR:%.*]] = ptrtoint i8* [[ARRAYIDX]] to i64
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// CHECK-NEXT: [[ALIGNED_INTPTR:%.*]] = and i64 [[INTPTR]], -16
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// CHECK-NEXT: [[DIFF:%.*]] = sub i64 [[ALIGNED_INTPTR]], [[INTPTR]]
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// CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = getelementptr inbounds i8, i8* [[ARRAYIDX]], i64 [[DIFF]]
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// CHECK-NEXT: [[PTRINT:%.*]] = ptrtoint i8* [[ALIGNED_RESULT]] to i64
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// CHECK-NEXT: [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 15
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// CHECK-NEXT: [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
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// CHECK-NEXT: call void @llvm.assume(i1 [[MASKCOND]])
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// CHECK-NEXT: [[CALL:%.*]] = call i32 @func(i8* [[ALIGNED_RESULT]])
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// CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], [1024 x i8]* [[BUF]], i64 0, i64 32
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// CHECK-NEXT: [[INTPTR2:%.*]] = ptrtoint i8* [[ARRAYIDX1]] to i64
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// CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = add i64 [[INTPTR2]], 31
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// CHECK-NEXT: [[ALIGNED_INTPTR4:%.*]] = and i64 [[OVER_BOUNDARY]], -32
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// CHECK-NEXT: [[DIFF5:%.*]] = sub i64 [[ALIGNED_INTPTR4]], [[INTPTR2]]
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// CHECK-NEXT: [[ALIGNED_RESULT6:%.*]] = getelementptr inbounds i8, i8* [[ARRAYIDX1]], i64 [[DIFF5]]
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// CHECK-NEXT: [[PTRINT7:%.*]] = ptrtoint i8* [[ALIGNED_RESULT6]] to i64
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// CHECK-NEXT: [[MASKEDPTR8:%.*]] = and i64 [[PTRINT7]], 31
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// CHECK-NEXT: [[MASKCOND9:%.*]] = icmp eq i64 [[MASKEDPTR8]], 0
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// CHECK-NEXT: call void @llvm.assume(i1 [[MASKCOND9]])
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// CHECK-NEXT: [[CALL10:%.*]] = call i32 @func(i8* [[ALIGNED_RESULT6]])
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// CHECK-NEXT: ret i32 1
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//
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int test_array_should_not_mask(void) {
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_Alignas(32) char buf[1024];
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// TODO: The align_up and align_down calls should be folded to no-ops
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func(__builtin_align_down(&buf[64], 16));
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func(__builtin_align_up(&buf[32], 32));
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// This expression can be constant-evaluated:
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return __builtin_is_aligned(&buf[64], 32);
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}
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