mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
10e28ca6b1
Try to convert two compares of a signed range check into a single unsigned compare. Examples: (icmp sge x, 0) & (icmp slt x, n) --> icmp ult x, n (icmp slt x, 0) | (icmp sgt x, n) --> icmp ugt x, n git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223224 91177308-0d34-0410-b5e6-96231b3b80d8
160 lines
3.7 KiB
LLVM
160 lines
3.7 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; Check simplification of
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; (icmp sgt x, -1) & (icmp sgt/sge n, x) --> icmp ugt/uge n, x
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; CHECK-LABEL: define i1 @test_and1
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; CHECK: [[R:%[0-9]+]] = icmp ugt i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_and1(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sge i32 %x, 0
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%b = icmp slt i32 %x, %nn
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_and2
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; CHECK: [[R:%[0-9]+]] = icmp uge i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_and2(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sgt i32 %x, -1
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%b = icmp sle i32 %x, %nn
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_and3
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; CHECK: [[R:%[0-9]+]] = icmp ugt i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_and3(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sgt i32 %nn, %x
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%b = icmp sge i32 %x, 0
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_and4
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; CHECK: [[R:%[0-9]+]] = icmp uge i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_and4(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sge i32 %nn, %x
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%b = icmp sge i32 %x, 0
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_or1
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; CHECK: [[R:%[0-9]+]] = icmp ule i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_or1(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp slt i32 %x, 0
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%b = icmp sge i32 %x, %nn
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%c = or i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_or2
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; CHECK: [[R:%[0-9]+]] = icmp ult i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_or2(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sle i32 %x, -1
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%b = icmp sgt i32 %x, %nn
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%c = or i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_or3
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; CHECK: [[R:%[0-9]+]] = icmp ule i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_or3(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp sle i32 %nn, %x
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%b = icmp slt i32 %x, 0
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%c = or i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @test_or4
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; CHECK: [[R:%[0-9]+]] = icmp ult i32 %nn, %x
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; CHECK: ret i1 [[R]]
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define i1 @test_or4(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp slt i32 %nn, %x
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%b = icmp slt i32 %x, 0
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%c = or i1 %a, %b
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ret i1 %c
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}
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; Negative tests
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; CHECK-LABEL: define i1 @negative1
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; CHECK: %a = icmp
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; CHECK: %b = icmp
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; CHECK: %c = and i1 %a, %b
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; CHECK: ret i1 %c
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define i1 @negative1(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp slt i32 %x, %nn
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%b = icmp sgt i32 %x, 0 ; should be: icmp sge
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @negative2
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; CHECK: %a = icmp
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; CHECK: %b = icmp
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; CHECK: %c = and i1 %a, %b
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; CHECK: ret i1 %c
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define i1 @negative2(i32 %x, i32 %n) {
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%a = icmp slt i32 %x, %n ; n can be negative
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%b = icmp sge i32 %x, 0
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @negative3
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; CHECK: %a = icmp
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; CHECK: %b = icmp
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; CHECK: %c = and i1 %a, %b
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; CHECK: ret i1 %c
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define i1 @negative3(i32 %x, i32 %y, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp slt i32 %x, %nn
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%b = icmp sge i32 %y, 0 ; should compare %x and not %y
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @negative4
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; CHECK: %a = icmp
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; CHECK: %b = icmp
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; CHECK: %c = and i1 %a, %b
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; CHECK: ret i1 %c
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define i1 @negative4(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp ne i32 %x, %nn ; should be: icmp slt/sle
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%b = icmp sge i32 %x, 0
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%c = and i1 %a, %b
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ret i1 %c
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}
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; CHECK-LABEL: define i1 @negative5
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; CHECK: %a = icmp
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; CHECK: %b = icmp
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; CHECK: %c = or i1 %a, %b
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; CHECK: ret i1 %c
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define i1 @negative5(i32 %x, i32 %n) {
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%nn = and i32 %n, 2147483647
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%a = icmp slt i32 %x, %nn
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%b = icmp sge i32 %x, 0
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%c = or i1 %a, %b ; should be: and
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ret i1 %c
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}
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