133 lines
3.8 KiB
LLVM
133 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+sse2 | FileCheck %s --check-prefix=X86
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64
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; The easy case: a constant power-of-2 divisor.
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define i64 @const_pow_2(i64 %x) {
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; X86-LABEL: const_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: andl $31, %eax
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; X86-NEXT: xorl %edx, %edx
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; X86-NEXT: retl
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;
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; X64-LABEL: const_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: movq %rdi, %rax
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; X64-NEXT: andl $31, %eax
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; X64-NEXT: retq
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%urem = urem i64 %x, 32
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ret i64 %urem
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}
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; A left-shifted power-of-2 divisor. Use a weird type for wider coverage.
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define i25 @shift_left_pow_2(i25 %x, i25 %y) {
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; X86-LABEL: shift_left_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %cl
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; X86-NEXT: movl $1, %eax
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; X86-NEXT: shll %cl, %eax
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; X86-NEXT: addl $33554431, %eax # imm = 0x1FFFFFF
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; X86-NEXT: andl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: retl
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;
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; X64-LABEL: shift_left_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: movl %esi, %ecx
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; X64-NEXT: movl $1, %eax
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; X64-NEXT: # kill: def $cl killed $cl killed $ecx
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; X64-NEXT: shll %cl, %eax
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; X64-NEXT: addl $33554431, %eax # imm = 0x1FFFFFF
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; X64-NEXT: andl %edi, %eax
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; X64-NEXT: retq
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%shl = shl i25 1, %y
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%urem = urem i25 %x, %shl
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ret i25 %urem
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}
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; A logically right-shifted sign bit is a power-of-2 or UB.
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define i16 @shift_right_pow_2(i16 %x, i16 %y) {
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; X86-LABEL: shift_right_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %cl
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; X86-NEXT: movl $32768, %eax # imm = 0x8000
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; X86-NEXT: shrl %cl, %eax
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; X86-NEXT: decl %eax
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; X86-NEXT: andw {{[0-9]+}}(%esp), %ax
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; X86-NEXT: # kill: def $ax killed $ax killed $eax
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; X86-NEXT: retl
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;
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; X64-LABEL: shift_right_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: movl %esi, %ecx
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; X64-NEXT: movl $32768, %eax # imm = 0x8000
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; X64-NEXT: # kill: def $cl killed $cl killed $ecx
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; X64-NEXT: shrl %cl, %eax
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; X64-NEXT: decl %eax
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; X64-NEXT: andl %edi, %eax
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; X64-NEXT: # kill: def $ax killed $ax killed $eax
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; X64-NEXT: retq
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%shr = lshr i16 -32768, %y
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%urem = urem i16 %x, %shr
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ret i16 %urem
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}
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; FIXME: A zero divisor would be UB, so this could be reduced to an 'and' with 3.
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define i8 @and_pow_2(i8 %x, i8 %y) {
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; X86-LABEL: and_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %cl
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; X86-NEXT: andb $4, %cl
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; X86-NEXT: movzbl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: divb %cl
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; X86-NEXT: movzbl %ah, %eax
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; X86-NEXT: # kill: def $al killed $al killed $eax
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; X86-NEXT: retl
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;
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; X64-LABEL: and_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: andb $4, %sil
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; X64-NEXT: movzbl %dil, %eax
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; X64-NEXT: divb %sil
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; X64-NEXT: movzbl %ah, %eax
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: retq
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%and = and i8 %y, 4
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%urem = urem i8 %x, %and
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ret i8 %urem
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}
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; A vector constant divisor should get the same treatment as a scalar.
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define <4 x i32> @vec_const_uniform_pow_2(<4 x i32> %x) {
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; X86-LABEL: vec_const_uniform_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: andps {{\.LCPI.*}}, %xmm0
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; X86-NEXT: retl
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;
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; X64-LABEL: vec_const_uniform_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: andps {{.*}}(%rip), %xmm0
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; X64-NEXT: retq
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%urem = urem <4 x i32> %x, <i32 16, i32 16, i32 16, i32 16>
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ret <4 x i32> %urem
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}
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define <4 x i32> @vec_const_nonuniform_pow_2(<4 x i32> %x) {
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; X86-LABEL: vec_const_nonuniform_pow_2:
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; X86: # %bb.0:
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; X86-NEXT: andps {{\.LCPI.*}}, %xmm0
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; X86-NEXT: retl
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;
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; X64-LABEL: vec_const_nonuniform_pow_2:
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; X64: # %bb.0:
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; X64-NEXT: andps {{.*}}(%rip), %xmm0
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; X64-NEXT: retq
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%urem = urem <4 x i32> %x, <i32 2, i32 4, i32 8, i32 16>
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ret <4 x i32> %urem
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}
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