mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-30 16:17:05 +00:00
0415b1810b
"(icmp op i8 A, B)" is equivalent to "(icmp op i8 (A & 0xff), B)" as a degenerate case. Allowing this as a "masked" comparison when analysing "(icmp) &/| (icmp)" allows us to combine them in more cases. rdar://problem/7625728 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189931 91177308-0d34-0410-b5e6-96231b3b80d8
153 lines
3.1 KiB
LLVM
153 lines
3.1 KiB
LLVM
; RUN: opt -instcombine -S -o - %s | FileCheck %s
|
|
|
|
define i1 @masked_and_notallzeroes(i32 %A) {
|
|
; CHECK-LABEL: @masked_and_notallzeroes
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 7
|
|
; CHECK: icmp ne i32 [[MASK]], 0
|
|
; CHECK-NOT: and i32 %A, 39
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp ne i32 %mask1, 0
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp ne i32 %mask2, 0
|
|
|
|
%res = and i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_or_allzeroes(i32 %A) {
|
|
; CHECK-LABEL: @masked_or_allzeroes
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 7
|
|
; CHECK: icmp eq i32 [[MASK]], 0
|
|
; CHECK-NOT: and i32 %A, 39
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp eq i32 %mask1, 0
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp eq i32 %mask2, 0
|
|
|
|
%res = or i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_and_notallones(i32 %A) {
|
|
; CHECK-LABEL: @masked_and_notallones
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 7
|
|
; CHECK: icmp ne i32 [[MASK]], 7
|
|
; CHECK-NOT: and i32 %A, 39
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp ne i32 %mask1, 7
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp ne i32 %mask2, 39
|
|
|
|
%res = and i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_or_allones(i32 %A) {
|
|
; CHECK-LABEL: @masked_or_allones
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 7
|
|
; CHECK: icmp eq i32 [[MASK]], 7
|
|
; CHECK-NOT: and i32 %A, 39
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp eq i32 %mask1, 7
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp eq i32 %mask2, 39
|
|
|
|
%res = or i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_and_notA(i32 %A) {
|
|
; CHECK-LABEL: @masked_and_notA
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 39
|
|
; CHECK: icmp ne i32 [[MASK]], %A
|
|
; CHECK-NOT: and i32 %A, 7
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp ne i32 %mask1, %A
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp ne i32 %mask2, %A
|
|
|
|
%res = and i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_or_A(i32 %A) {
|
|
; CHECK-LABEL: @masked_or_A
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 39
|
|
; CHECK: icmp eq i32 [[MASK]], %A
|
|
; CHECK-NOT: and i32 %A, 7
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 7
|
|
%tst1 = icmp eq i32 %mask1, %A
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp eq i32 %mask2, %A
|
|
|
|
%res = or i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @masked_or_allzeroes_notoptimised(i32 %A) {
|
|
; CHECK-LABEL: @masked_or_allzeroes_notoptimised
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 15
|
|
; CHECK: icmp eq i32 [[MASK]], 0
|
|
; CHECK: [[MASK:%.*]] = and i32 %A, 39
|
|
; CHECK: icmp eq i32 [[MASK]], 0
|
|
; CHECK: ret i1
|
|
|
|
%mask1 = and i32 %A, 15
|
|
%tst1 = icmp eq i32 %mask1, 0
|
|
|
|
%mask2 = and i32 %A, 39
|
|
%tst2 = icmp eq i32 %mask2, 0
|
|
|
|
%res = or i1 %tst1, %tst2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @nomask_lhs(i32 %in) {
|
|
; CHECK-LABEL: @nomask_lhs
|
|
; CHECK: [[MASK:%.*]] = and i32 %in, 1
|
|
; CHECK: icmp eq i32 [[MASK]], 0
|
|
; CHECK-NOT: icmp
|
|
; CHECK: ret i1
|
|
%tst1 = icmp eq i32 %in, 0
|
|
|
|
%masked = and i32 %in, 1
|
|
%tst2 = icmp eq i32 %masked, 0
|
|
|
|
%val = or i1 %tst1, %tst2
|
|
ret i1 %val
|
|
}
|
|
|
|
|
|
define i1 @nomask_rhs(i32 %in) {
|
|
; CHECK-LABEL: @nomask_rhs
|
|
; CHECK: [[MASK:%.*]] = and i32 %in, 1
|
|
; CHECK: icmp eq i32 [[MASK]], 0
|
|
; CHECK-NOT: icmp
|
|
; CHECK: ret i1
|
|
%masked = and i32 %in, 1
|
|
%tst1 = icmp eq i32 %masked, 0
|
|
|
|
%tst2 = icmp eq i32 %in, 0
|
|
|
|
%val = or i1 %tst1, %tst2
|
|
ret i1 %val
|
|
}
|