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[InstCombine] Add pre-commit tests. NFC.
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‎llvm/test/Transforms/InstCombine/overflow.ll‎

Lines changed: 101 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@ define i32 @test1(i32 %a, i32 %b) nounwind ssp {
1111
; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[SADD]], 1
1212
; CHECK-NEXT: br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
14-
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2:[0-9]+]]
14+
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3:[0-9]+]]
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: [[SADD_RESULT:%.*]] = extractvalue { i32, i1 } [[SADD]], 0
@@ -49,7 +49,7 @@ define i32 @test2(i32 %a, i32 %b, ptr %P) nounwind ssp {
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ugt i64 [[ADD_OFF]], 4294967295
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; CHECK-NEXT: br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
5151
; CHECK: if.then:
52-
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
52+
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
5555
; CHECK-NEXT: [[CONV9:%.*]] = trunc i64 [[ADD]] to i32
@@ -86,7 +86,7 @@ define i64 @test3(i32 %a, i32 %b) nounwind ssp {
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i64 [[TMP0]], -4294967296
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; CHECK-NEXT: br i1 [[TMP1]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
89-
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
89+
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: br label [[IF_END]]
9191
; CHECK: if.end:
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; CHECK-NEXT: ret i64 [[ADD]]
@@ -116,7 +116,7 @@ define zeroext i8 @test4(i8 signext %a, i8 signext %b) nounwind ssp {
116116
; CHECK-NEXT: [[CMP:%.*]] = extractvalue { i8, i1 } [[SADD]], 1
117117
; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
118118
; CHECK: if.then:
119-
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
119+
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
120120
; CHECK-NEXT: unreachable
121121
; CHECK: if.end:
122122
; CHECK-NEXT: [[SADD_RESULT:%.*]] = extractvalue { i8, i1 } [[SADD]], 0
@@ -150,7 +150,7 @@ define i32 @test8(i64 %a, i64 %b) nounwind ssp {
150150
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i64 [[TMP0]], -4294967296
151151
; CHECK-NEXT: br i1 [[TMP1]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
152152
; CHECK: if.then:
153-
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
153+
; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
154154
; CHECK-NEXT: br label [[IF_END]]
155155
; CHECK: if.end:
156156
; CHECK-NEXT: [[CONV9:%.*]] = trunc i64 [[ADD]] to i32
@@ -171,3 +171,99 @@ if.end:
171171
ret i32 %conv9
172172
}
173173

174+
define i32 @uadd_no_overflow(i32 %a, i32 %b) {
175+
; CHECK-LABEL: @uadd_no_overflow(
176+
; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
177+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
178+
; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
179+
; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
180+
; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
181+
; CHECK-NEXT: ret i32 [[RES]]
182+
;
183+
%val = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %a, i32 %b)
184+
%ov = extractvalue { i32, i1 } %val, 1
185+
%nowrap = xor i1 %ov, true
186+
tail call void @llvm.assume(i1 %nowrap)
187+
%res = extractvalue { i32, i1 } %val, 0
188+
ret i32 %res
189+
}
190+
191+
define i32 @smul_no_overflow(i32 %a, i32 %b) {
192+
; CHECK-LABEL: @smul_no_overflow(
193+
; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
194+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
195+
; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
196+
; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
197+
; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
198+
; CHECK-NEXT: ret i32 [[RES]]
199+
;
200+
%val = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %a, i32 %b)
201+
%ov = extractvalue { i32, i1 } %val, 1
202+
%nowrap = xor i1 %ov, true
203+
tail call void @llvm.assume(i1 %nowrap)
204+
%res = extractvalue { i32, i1 } %val, 0
205+
ret i32 %res
206+
}
207+
208+
define i32 @smul_overflow(i32 %a, i32 %b) {
209+
; CHECK-LABEL: @smul_overflow(
210+
; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
211+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
212+
; CHECK-NEXT: tail call void @llvm.assume(i1 [[OV]])
213+
; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
214+
; CHECK-NEXT: ret i32 [[RES]]
215+
;
216+
%val = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %a, i32 %b)
217+
%ov = extractvalue { i32, i1 } %val, 1
218+
tail call void @llvm.assume(i1 %ov)
219+
%res = extractvalue { i32, i1 } %val, 0
220+
ret i32 %res
221+
}
222+
223+
define i32 @uadd_no_overflow_invalid1(i32 %a, i32 %b, i1 %cond) {
224+
; CHECK-LABEL: @uadd_no_overflow_invalid1(
225+
; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
226+
; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
227+
; CHECK-NEXT: call void @use(i32 [[RES]])
228+
; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
229+
; CHECK: if.then:
230+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
231+
; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
232+
; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
233+
; CHECK-NEXT: ret i32 [[RES]]
234+
; CHECK: if.else:
235+
; CHECK-NEXT: ret i32 0
236+
;
237+
%val = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %a, i32 %b)
238+
%res = extractvalue { i32, i1 } %val, 0
239+
call void @use(i32 %res)
240+
br i1 %cond, label %if.then, label %if.else
241+
if.then:
242+
%ov = extractvalue { i32, i1 } %val, 1
243+
%nowrap = xor i1 %ov, true
244+
tail call void @llvm.assume(i1 %nowrap)
245+
ret i32 %res
246+
if.else:
247+
ret i32 0
248+
}
249+
250+
define i32 @uadd_no_overflow_invalid2(i32 %a, i32 %b, i1 %cond) {
251+
; CHECK-LABEL: @uadd_no_overflow_invalid2(
252+
; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
253+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
254+
; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
255+
; CHECK-NEXT: call void @use(i32 0)
256+
; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
257+
; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
258+
; CHECK-NEXT: ret i32 [[RES]]
259+
;
260+
%val = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %a, i32 %b)
261+
%ov = extractvalue { i32, i1 } %val, 1
262+
%nowrap = xor i1 %ov, true
263+
call void @use(i32 0) ; It is not guaranteed to transfer execution to its successors
264+
tail call void @llvm.assume(i1 %nowrap)
265+
%res = extractvalue { i32, i1 } %val, 0
266+
ret i32 %res
267+
}
268+
269+
declare void @use(i32)

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