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[InstCombine][InstSimplify] Move constant-folding tests in result-of-usub-is-non-zero-and-no-overflow.ll 

llvm-svn: 371737
This commit is contained in:
Roman Lebedev 2019-09-12 14:12:31 +00:00
parent b3e0937f0a
commit 80a8a85758
2 changed files with 149 additions and 149 deletions
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158
llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll
View File

@ -287,148 +287,8 @@ define i1 @t9_commutative(i8 %base, i8 %offset) {
;-------------------------------------------------------------------------------
; If we are checking that we either did not get null or got no overflow,
; this is tautological and is always true.
define i1 @t10(i8 %base, i8 %offset) {
define i1 @t10(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t10(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t10_strict_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t10_strict_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ugt i8 %base, %offset ; but not for non-strict predicate
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t11(i8 %base, i8 %offset) {
; CHECK-LABEL: @t11(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%no_underflow = xor i1 %underflow, -1
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
; Likewise, if we are checking that we both got null and overflow happened,
; it makes no sense and is always false.
define i1 @t12(i8 %base, i8 %offset) {
; CHECK-LABEL: @t12(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %offset
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = and i1 %null, %underflow
ret i1 %r
}
define i1 @t12_nonstrict_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t12_nonstrict_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp uge i8 %adjusted, %base ; but not for non-strict predicate
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = and i1 %null, %underflow
ret i1 %r
}
define i1 @t13(i8 %base, i8 %offset) {
; CHECK-LABEL: @t13(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
%r = and i1 %null, %underflow
ret i1 %r
}
;-------------------------------------------------------------------------------
define i1 @t15(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t15(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint i64* [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
@ -450,8 +310,8 @@ define i1 @t15(i64 %base, i64* nonnull %offsetptr) {
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t16_commutative(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t16_commutative(
define i1 @t11_commutative(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t11_commutative(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint i64* [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
@ -474,8 +334,8 @@ define i1 @t16_commutative(i64 %base, i64* nonnull %offsetptr) {
ret i1 %r
}
define i1 @t17(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t17(
define i1 @t12(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t12(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint i64* [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
@ -497,8 +357,8 @@ define i1 @t17(i64 %base, i64* nonnull %offsetptr) {
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t18(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t18(
define i1 @t13(i64 %base, i64* nonnull %offsetptr) {
; CHECK-LABEL: @t13(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint i64* [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
@ -521,8 +381,8 @@ define i1 @t18(i64 %base, i64* nonnull %offsetptr) {
ret i1 %r
}
define i1 @t19_bad(i64 %base, i64 %offset) {
; CHECK-LABEL: @t19_bad(
define i1 @t14_bad(i64 %base, i64 %offset) {
; CHECK-LABEL: @t14_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[ADJUSTED]], [[BASE]]

140
llvm/test/Transforms/InstSimplify/result-of-usub-is-non-zero-and-no-overflow.ll Normal file
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@ -0,0 +1,140 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -instsimplify -S | FileCheck %s
; Here we subtract two values, check that subtraction did not overflow AND
; that the result is non-zero. This can be simplified just to a comparison
; between the base and offset.
declare void @use8(i8)
declare void @use64(i64)
declare void @use1(i1)
declare void @llvm.assume(i1)
; If we are checking that we either did not get null or got no overflow,
; this is tautological and is always true.
define i1 @t1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t1_strict_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1_strict_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ugt i8 %base, %offset ; but not for non-strict predicate
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t1_commutativity(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1_commutativity(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %offset, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
; Likewise, if we are checking that we both got null and overflow happened,
; it makes no sense and is always false.
define i1 @t2(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %offset
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = and i1 %null, %underflow
ret i1 %r
}
define i1 @t2_nonstrict_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2_nonstrict_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp uge i8 %adjusted, %base ; but not for non-strict predicate
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = and i1 %null, %underflow
ret i1 %r
}
define i1 @t2_commutativity(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2_commutativity(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ugt i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ugt i8 %offset, %base
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = and i1 %null, %underflow
ret i1 %r
}