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llvm-project/llvm/test/CodeGen/X86/icmp-shift-opt.ll

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=i686-- < %s | FileCheck %s --check-prefix=X86
; RUN: llc -mtriple=x86_64-- < %s | FileCheck %s --check-prefix=X64
; Optimize expanded SRL/SHL used as an input of
; SETCC comparing it with zero by removing rotation.
;
; See https://bugs.llvm.org/show_bug.cgi?id=50197
define i128 @opt_setcc_lt_power_of_2(i128 %a) nounwind {
; X86-LABEL: opt_setcc_lt_power_of_2:
; X86: # %bb.0:
; X86-NEXT: pushl %ebp
; X86-NEXT: pushl %ebx
; X86-NEXT: pushl %edi
; X86-NEXT: pushl %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
; X86-NEXT: .p2align 4, 0x90
; X86-NEXT: .LBB0_1: # %loop
; X86-NEXT: # =>This Inner Loop Header: Depth=1
; X86-NEXT: addl $1, %edi
; X86-NEXT: adcl $0, %esi
; X86-NEXT: adcl $0, %edx
; X86-NEXT: adcl $0, %ecx
; X86-NEXT: movl %edx, %ebx
; X86-NEXT: orl %ecx, %ebx
; X86-NEXT: movl %esi, %ebp
; X86-NEXT: orl %ebx, %ebp
; X86-NEXT: shrdl $28, %ebx, %ebp
; X86-NEXT: jne .LBB0_1
; X86-NEXT: # %bb.2: # %exit
; X86-NEXT: movl %edi, (%eax)
; X86-NEXT: movl %esi, 4(%eax)
; X86-NEXT: movl %edx, 8(%eax)
; X86-NEXT: movl %ecx, 12(%eax)
; X86-NEXT: popl %esi
; X86-NEXT: popl %edi
; X86-NEXT: popl %ebx
; X86-NEXT: popl %ebp
; X86-NEXT: retl $4
;
; X64-LABEL: opt_setcc_lt_power_of_2:
; X64: # %bb.0:
; X64-NEXT: movq %rsi, %rdx
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: .p2align 4, 0x90
; X64-NEXT: .LBB0_1: # %loop
; X64-NEXT: # =>This Inner Loop Header: Depth=1
; X64-NEXT: addq $1, %rax
; X64-NEXT: adcq $0, %rdx
; X64-NEXT: movq %rax, %rcx
; X64-NEXT: shrq $60, %rcx
; X64-NEXT: orq %rdx, %rcx
; X64-NEXT: jne .LBB0_1
; X64-NEXT: # %bb.2: # %exit
; X64-NEXT: retq
br label %loop
loop:
%phi.a = phi i128 [ %a, %0 ], [ %inc, %loop ]
%inc = add i128 %phi.a, 1
%cmp = icmp ult i128 %inc, 1152921504606846976
br i1 %cmp, label %exit, label %loop
exit:
ret i128 %inc
}
define i1 @opt_setcc_srl_eq_zero(i128 %a) nounwind {
; X86-LABEL: opt_setcc_srl_eq_zero:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: orl %ecx, %edx
; X86-NEXT: orl %eax, %edx
; X86-NEXT: orl %ecx, %eax
; X86-NEXT: shldl $15, %edx, %eax
; X86-NEXT: sete %al
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_srl_eq_zero:
; X64: # %bb.0:
; X64-NEXT: shrq $17, %rdi
; X64-NEXT: orq %rsi, %rdi
; X64-NEXT: sete %al
; X64-NEXT: retq
%srl = lshr i128 %a, 17
%cmp = icmp eq i128 %srl, 0
ret i1 %cmp
}
define i1 @opt_setcc_srl_ne_zero(i128 %a) nounwind {
; X86-LABEL: opt_setcc_srl_ne_zero:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: orl %ecx, %edx
; X86-NEXT: orl %eax, %edx
; X86-NEXT: orl %ecx, %eax
; X86-NEXT: shldl $15, %edx, %eax
; X86-NEXT: setne %al
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_srl_ne_zero:
; X64: # %bb.0:
; X64-NEXT: shrq $17, %rdi
; X64-NEXT: orq %rsi, %rdi
; X64-NEXT: setne %al
; X64-NEXT: retq
%srl = lshr i128 %a, 17
%cmp = icmp ne i128 %srl, 0
ret i1 %cmp
}
define i1 @opt_setcc_shl_eq_zero(i128 %a) nounwind {
; X86-LABEL: opt_setcc_shl_eq_zero:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shll $17, %ecx
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl %ecx, %eax
; X86-NEXT: sete %al
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_shl_eq_zero:
; X64: # %bb.0:
; X64-NEXT: shlq $17, %rsi
; X64-NEXT: orq %rdi, %rsi
; X64-NEXT: sete %al
; X64-NEXT: retq
%shl = shl i128 %a, 17
%cmp = icmp eq i128 %shl, 0
ret i1 %cmp
}
define i1 @opt_setcc_shl_ne_zero(i128 %a) nounwind {
; X86-LABEL: opt_setcc_shl_ne_zero:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shll $17, %ecx
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl %ecx, %eax
; X86-NEXT: setne %al
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_shl_ne_zero:
; X64: # %bb.0:
; X64-NEXT: shlq $17, %rsi
; X64-NEXT: orq %rdi, %rsi
; X64-NEXT: setne %al
; X64-NEXT: retq
%shl = shl i128 %a, 17
%cmp = icmp ne i128 %shl, 0
ret i1 %cmp
}
; Negative test: optimization should not be applied if shift has multiple users.
define i1 @opt_setcc_shl_eq_zero_multiple_shl_users(i128 %a) nounwind {
; X86-LABEL: opt_setcc_shl_eq_zero_multiple_shl_users:
; X86: # %bb.0:
; X86-NEXT: pushl %ebx
; X86-NEXT: pushl %edi
; X86-NEXT: pushl %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NEXT: shldl $17, %esi, %edx
; X86-NEXT: shldl $17, %ecx, %esi
; X86-NEXT: shldl $17, %eax, %ecx
; X86-NEXT: shll $17, %eax
; X86-NEXT: movl %ecx, %edi
; X86-NEXT: orl %edx, %edi
; X86-NEXT: movl %eax, %ebx
; X86-NEXT: orl %esi, %ebx
; X86-NEXT: orl %edi, %ebx
; X86-NEXT: sete %bl
; X86-NEXT: pushl %edx
; X86-NEXT: pushl %esi
; X86-NEXT: pushl %ecx
; X86-NEXT: pushl %eax
; X86-NEXT: calll use@PLT
; X86-NEXT: addl $16, %esp
; X86-NEXT: movl %ebx, %eax
; X86-NEXT: popl %esi
; X86-NEXT: popl %edi
; X86-NEXT: popl %ebx
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_shl_eq_zero_multiple_shl_users:
; X64: # %bb.0:
; X64-NEXT: pushq %rbx
; X64-NEXT: shldq $17, %rdi, %rsi
; X64-NEXT: shlq $17, %rdi
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: orq %rsi, %rax
; X64-NEXT: sete %bl
; X64-NEXT: callq use@PLT
; X64-NEXT: movl %ebx, %eax
; X64-NEXT: popq %rbx
; X64-NEXT: retq
%shl = shl i128 %a, 17
%cmp = icmp eq i128 %shl, 0
call void @use(i128 %shl)
ret i1 %cmp
}
; Check that optimization is applied to DAG having appropriate shape
; even if there were no actual shift's expansion.
define i1 @opt_setcc_expanded_shl_correct_shifts(i64 %a, i64 %b) nounwind {
; X86-LABEL: opt_setcc_expanded_shl_correct_shifts:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: orl %eax, %ecx
; X86-NEXT: shldl $17, %eax, %ecx
; X86-NEXT: sete %al
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_expanded_shl_correct_shifts:
; X64: # %bb.0:
; X64-NEXT: shlq $17, %rdi
; X64-NEXT: orq %rsi, %rdi
; X64-NEXT: sete %al
; X64-NEXT: retq
%shl.a = shl i64 %a, 17
%srl.b = lshr i64 %b, 47
%or.0 = or i64 %shl.a, %srl.b
%shl.b = shl i64 %b, 17
%or.1 = or i64 %or.0, %shl.b
%cmp = icmp eq i64 %or.1, 0
ret i1 %cmp
}
; Negative test: optimization should not be applied as
; constants used in shifts do not match.
define i1 @opt_setcc_expanded_shl_wrong_shifts(i64 %a, i64 %b) nounwind {
; X86-LABEL: opt_setcc_expanded_shl_wrong_shifts:
; X86: # %bb.0:
; X86-NEXT: pushl %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NEXT: shldl $17, %edx, %esi
; X86-NEXT: shldl $17, %ecx, %edx
; X86-NEXT: shldl $18, %eax, %ecx
; X86-NEXT: shll $18, %eax
; X86-NEXT: orl %edx, %eax
; X86-NEXT: orl %esi, %ecx
; X86-NEXT: orl %eax, %ecx
; X86-NEXT: sete %al
; X86-NEXT: popl %esi
; X86-NEXT: retl
;
; X64-LABEL: opt_setcc_expanded_shl_wrong_shifts:
; X64: # %bb.0:
; X64-NEXT: shldq $17, %rsi, %rdi
; X64-NEXT: shlq $18, %rsi
; X64-NEXT: orq %rdi, %rsi
; X64-NEXT: sete %al
; X64-NEXT: retq
%shl.a = shl i64 %a, 17
%srl.b = lshr i64 %b, 47
%or.0 = or i64 %shl.a, %srl.b
%shl.b = shl i64 %b, 18
%or.1 = or i64 %or.0, %shl.b
%cmp = icmp eq i64 %or.1, 0
ret i1 %cmp
}
declare void @use(i128 %a)
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