; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=i686-unknown-linux-gnu < %s | FileCheck %s --check-prefix=X86
; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefix=X64
; Fold
; ptr - (ptr & C)
; To
; ptr & (~C)
;
; This needs to be a backend-level fold because only by now pointers
; are just registers; in middle-end IR this can only be done via @llvm.ptrmask()
; intrinsic which is not sufficiently widely-spread yet.
;
; https://bugs.llvm.org/show_bug.cgi?id=44448
; The basic positive tests
define i32 @t0_32(i32 %ptr) nounwind {
; X86-LABEL: t0_32:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: andl $-16, %eax
; X86-NEXT: retl
;
; X64-LABEL: t0_32:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: andl $-16, %eax
; X64-NEXT: retq
%bias = and i32 %ptr, 15
%r = sub i32 %ptr, %bias
ret i32 %r
}
define i64 @t1_64(i64 %ptr) nounwind {
; X86-LABEL: t1_64:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: andl $-16, %eax
; X86-NEXT: retl
;
; X64-LABEL: t1_64:
; X64: # %bb.0:
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: andq $-16, %rax
; X64-NEXT: retq
%bias = and i64 %ptr, 15
%r = sub i64 %ptr, %bias
ret i64 %r
}
define i32 @t2_powerof2(i32 %ptr) nounwind {
; X86-LABEL: t2_powerof2:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: andl $-17, %eax
; X86-NEXT: retl
;
; X64-LABEL: t2_powerof2:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: andl $-17, %eax
; X64-NEXT: retq
%bias = and i32 %ptr, 16
%r = sub i32 %ptr, %bias
ret i32 %r
}
define i32 @t3_random_constant(i32 %ptr) nounwind {
; X86-LABEL: t3_random_constant:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: andl $-43, %eax
; X86-NEXT: retl
;
; X64-LABEL: t3_random_constant:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: andl $-43, %eax
; X64-NEXT: retq
%bias = and i32 %ptr, 42
%r = sub i32 %ptr, %bias
ret i32 %r
}
; Extra use tests
define i32 @t4_extrause(i32 %ptr, ptr %bias_storage) nounwind {
; X86-LABEL: t4_extrause:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl %eax, %edx
; X86-NEXT: andl $15, %edx
; X86-NEXT: movl %edx, (%ecx)
; X86-NEXT: andl $-16, %eax
; X86-NEXT: retl
;
; X64-LABEL: t4_extrause:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: movl %edi, %ecx
; X64-NEXT: andl $15, %ecx
; X64-NEXT: movl %ecx, (%rsi)
; X64-NEXT: andl $-16, %eax
; X64-NEXT: retq
%bias = and i32 %ptr, 15
store i32 %bias, ptr %bias_storage
%r = sub i32 %ptr, %bias
ret i32 %r
}
; Negative tests
define i32 @n5_different_ptrs(i32 %ptr0, i32 %ptr1) nounwind {
; X86-LABEL: n5_different_ptrs:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: andl $15, %ecx
; X86-NEXT: subl %ecx, %eax
; X86-NEXT: retl
;
; X64-LABEL: n5_different_ptrs:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: andl $15, %esi
; X64-NEXT: subl %esi, %eax
; X64-NEXT: retq
%bias = and i32 %ptr1, 15 ; not %ptr0
%r = sub i32 %ptr0, %bias ; not %ptr1
ret i32 %r
}
define i32 @n6_sub_is_not_commutative(i32 %ptr) nounwind {
; X86-LABEL: n6_sub_is_not_commutative:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl %ecx, %eax
; X86-NEXT: andl $15, %eax
; X86-NEXT: subl %ecx, %eax
; X86-NEXT: retl
;
; X64-LABEL: n6_sub_is_not_commutative:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: andl $15, %eax
; X64-NEXT: subl %edi, %eax
; X64-NEXT: retq
%bias = and i32 %ptr, 15
%r = sub i32 %bias, %ptr ; wrong order
ret i32 %r
}
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