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|
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=armv7 %s -o - | FileCheck %s
; 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 i64 @opt_setcc_lt_power_of_2(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_lt_power_of_2:
; CHECK: @ %bb.0:
; CHECK-NEXT: .LBB0_1: @ %loop
; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
; CHECK-NEXT: adds r0, r0, #1
; CHECK-NEXT: adc r1, r1, #0
; CHECK-NEXT: orrs r2, r1, r0, lsr #16
; CHECK-NEXT: bne .LBB0_1
; CHECK-NEXT: @ %bb.2: @ %exit
; CHECK-NEXT: bx lr
br label %loop
loop:
%phi.a = phi i64 [ %a, %0 ], [ %inc, %loop ]
%inc = add i64 %phi.a, 1
%cmp = icmp ult i64 %inc, 65536
br i1 %cmp, label %exit, label %loop
exit:
ret i64 %inc
}
define i1 @opt_setcc_srl_eq_zero(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_srl_eq_zero:
; CHECK: @ %bb.0:
; CHECK-NEXT: orr r0, r1, r0, lsr #17
; CHECK-NEXT: clz r0, r0
; CHECK-NEXT: lsr r0, r0, #5
; CHECK-NEXT: bx lr
%srl = lshr i64 %a, 17
%cmp = icmp eq i64 %srl, 0
ret i1 %cmp
}
define i1 @opt_setcc_srl_ne_zero(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_srl_ne_zero:
; CHECK: @ %bb.0:
; CHECK-NEXT: orrs r0, r1, r0, lsr #17
; CHECK-NEXT: movwne r0, #1
; CHECK-NEXT: bx lr
%srl = lshr i64 %a, 17
%cmp = icmp ne i64 %srl, 0
ret i1 %cmp
}
define i1 @opt_setcc_shl_eq_zero(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_shl_eq_zero:
; CHECK: @ %bb.0:
; CHECK-NEXT: orr r0, r0, r1, lsl #17
; CHECK-NEXT: clz r0, r0
; CHECK-NEXT: lsr r0, r0, #5
; CHECK-NEXT: bx lr
%shl = shl i64 %a, 17
%cmp = icmp eq i64 %shl, 0
ret i1 %cmp
}
define i1 @opt_setcc_shl_ne_zero(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_shl_ne_zero:
; CHECK: @ %bb.0:
; CHECK-NEXT: orrs r0, r0, r1, lsl #17
; CHECK-NEXT: movwne r0, #1
; CHECK-NEXT: bx lr
%shl = shl i64 %a, 17
%cmp = icmp ne i64 %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(i64 %a) nounwind {
; CHECK-LABEL: opt_setcc_shl_eq_zero_multiple_shl_users:
; CHECK: @ %bb.0:
; CHECK-NEXT: push {r4, r5, r11, lr}
; CHECK-NEXT: mov r4, r0
; CHECK-NEXT: lsl r0, r1, #17
; CHECK-NEXT: orr r5, r0, r4, lsr #15
; CHECK-NEXT: lsl r0, r4, #17
; CHECK-NEXT: mov r1, r5
; CHECK-NEXT: bl use
; CHECK-NEXT: orr r0, r5, r4, lsl #17
; CHECK-NEXT: clz r0, r0
; CHECK-NEXT: lsr r0, r0, #5
; CHECK-NEXT: pop {r4, r5, r11, pc}
%shl = shl i64 %a, 17
%cmp = icmp eq i64 %shl, 0
call void @use(i64 %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(i32 %a, i32 %b) nounwind {
; CHECK-LABEL: opt_setcc_expanded_shl_correct_shifts:
; CHECK: @ %bb.0:
; CHECK-NEXT: orr r0, r1, r0, lsl #17
; CHECK-NEXT: clz r0, r0
; CHECK-NEXT: lsr r0, r0, #5
; CHECK-NEXT: bx lr
%shl.a = shl i32 %a, 17
%srl.b = lshr i32 %b, 15
%or.0 = or i32 %shl.a, %srl.b
%shl.b = shl i32 %b, 17
%or.1 = or i32 %or.0, %shl.b
%cmp = icmp eq i32 %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(i32 %a, i32 %b) nounwind {
; CHECK-LABEL: opt_setcc_expanded_shl_wrong_shifts:
; CHECK: @ %bb.0:
; CHECK-NEXT: lsl r0, r0, #17
; CHECK-NEXT: orr r0, r0, r1, lsr #15
; CHECK-NEXT: orr r0, r0, r1, lsl #18
; CHECK-NEXT: clz r0, r0
; CHECK-NEXT: lsr r0, r0, #5
; CHECK-NEXT: bx lr
%shl.a = shl i32 %a, 17
%srl.b = lshr i32 %b, 15
%or.0 = or i32 %shl.a, %srl.b
%shl.b = shl i32 %b, 18
%or.1 = or i32 %or.0, %shl.b
%cmp = icmp eq i32 %or.1, 0
ret i1 %cmp
}
define i1 @opt_setcc_shl_ne_zero_i128(i128 %a) nounwind {
; CHECK-LABEL: opt_setcc_shl_ne_zero_i128:
; CHECK: @ %bb.0:
; CHECK-NEXT: orr r0, r2, r0
; CHECK-NEXT: orr r0, r1, r0
; CHECK-NEXT: orr r1, r0, r3
; CHECK-NEXT: lsl r1, r1, #17
; CHECK-NEXT: orrs r0, r1, r0, lsr #15
; CHECK-NEXT: movwne r0, #1
; CHECK-NEXT: bx lr
%shl = shl i128 %a, 17
%cmp = icmp ne i128 %shl, 0
ret i1 %cmp
}
declare void @use(i64 %a)
|
