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[NFC][InstCombine] Add tests for combining icmp of no-wrap sub w/ constant. 

llvm-svn: 357360
This commit is contained in:
Luqman Aden 2019-03-31 08:58:50 +00:00
parent 75e74e077c
commit 7c67dbdc65
1 changed files with 90 additions and 0 deletions
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90
llvm/test/Transforms/InstCombine/icmp-sub.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
define i1 @test_nuw_and_unsigned_pred(i64 %x) {
; CHECK-LABEL: @test_nuw_and_unsigned_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nuw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp ult i64 [[Y]], 3
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nuw i64 10, %x
%z = icmp ult i64 %y, 3
ret i1 %z
}
define i1 @test_nsw_and_signed_pred(i64 %x) {
; CHECK-LABEL: @test_nsw_and_signed_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nsw i64 3, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp sgt i64 [[Y]], 10
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nsw i64 3, %x
%z = icmp sgt i64 %y, 10
ret i1 %z
}
define i1 @test_nuw_nsw_and_unsigned_pred(i64 %x) {
; CHECK-LABEL: @test_nuw_nsw_and_unsigned_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nuw nsw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp ult i64 [[Y]], 4
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nuw nsw i64 10, %x
%z = icmp ule i64 %y, 3
ret i1 %z
}
define i1 @test_nuw_nsw_and_signed_pred(i64 %x) {
; CHECK-LABEL: @test_nuw_nsw_and_signed_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nuw nsw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp slt i64 [[Y]], 3
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nuw nsw i64 10, %x
%z = icmp slt i64 %y, 3
ret i1 %z
}
define i1 @test_negative_nuw_and_signed_pred(i64 %x) {
; CHECK-LABEL: @test_negative_nuw_and_signed_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nuw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp slt i64 [[Y]], 3
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nuw i64 10, %x
%z = icmp slt i64 %y, 3
ret i1 %z
}
define i1 @test_negative_nsw_and_unsigned_pred(i64 %x) {
; CHECK-LABEL: @test_negative_nsw_and_unsigned_pred(
; CHECK-NEXT: [[Y:%.*]] = sub nsw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp ult i64 [[Y]], 3
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nsw i64 10, %x
%z = icmp ult i64 %y, 3
ret i1 %z
}
define i1 @test_negative_combined_sub_unsigned_overflow(i64 %x) {
; CHECK-LABEL: @test_negative_combined_sub_unsigned_overflow(
; CHECK-NEXT: [[Y:%.*]] = sub nuw i64 10, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp ult i64 [[Y]], 11
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nuw i64 10, %x
%z = icmp ult i64 %y, 11
ret i1 %z
}
define i1 @test_negative_combined_sub_signed_overflow(i8 %x) {
; CHECK-LABEL: @test_negative_combined_sub_signed_overflow(
; CHECK-NEXT: [[Y:%.*]] = sub nsw i8 127, [[X:%.*]]
; CHECK-NEXT: [[Z:%.*]] = icmp slt i8 [[Y]], -1
; CHECK-NEXT: ret i1 [[Z]]
;
%y = sub nsw i8 127, %x
%z = icmp slt i8 %y, -1
ret i1 %z
}