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

+101-5
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@ define i32 @test1(i32 %a, i32 %b) nounwind ssp {
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; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[SADD]], 1
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; CHECK-NEXT: br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2:[0-9]+]]
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; 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:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; 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:
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: br label [[IF_END]]
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; 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 {
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; CHECK-NEXT: [[CMP:%.*]] = extractvalue { i8, i1 } [[SADD]], 1
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; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: unreachable
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; CHECK: if.end:
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; CHECK-NEXT: [[SADD_RESULT:%.*]] = extractvalue { i8, i1 } [[SADD]], 0
@@ -150,7 +150,7 @@ define i32 @test8(i64 %a, i64 %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:
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR2]]
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; CHECK-NEXT: tail call void @throwAnExceptionOrWhatever() #[[ATTR3]]
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: [[CONV9:%.*]] = trunc i64 [[ADD]] to i32
@@ -171,3 +171,99 @@ if.end:
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ret i32 %conv9
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}
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define i32 @uadd_no_overflow(i32 %a, i32 %b) {
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; CHECK-LABEL: @uadd_no_overflow(
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; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
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; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
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; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
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; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
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; CHECK-NEXT: ret i32 [[RES]]
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;
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%val = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %a, i32 %b)
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%ov = extractvalue { i32, i1 } %val, 1
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%nowrap = xor i1 %ov, true
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tail call void @llvm.assume(i1 %nowrap)
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%res = extractvalue { i32, i1 } %val, 0
188+
ret i32 %res
189+
}
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define i32 @smul_no_overflow(i32 %a, i32 %b) {
192+
; CHECK-LABEL: @smul_no_overflow(
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; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
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; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
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; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
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; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
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; CHECK-NEXT: ret i32 [[RES]]
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;
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%val = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %a, i32 %b)
201+
%ov = extractvalue { i32, i1 } %val, 1
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%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:%.*]])
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; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[OV]])
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; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
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; CHECK-NEXT: ret i32 [[RES]]
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;
216+
%val = tail call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %a, i32 %b)
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%ov = extractvalue { i32, i1 } %val, 1
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tail call void @llvm.assume(i1 %ov)
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%res = extractvalue { i32, i1 } %val, 0
220+
ret i32 %res
221+
}
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223+
define i32 @uadd_no_overflow_invalid1(i32 %a, i32 %b, i1 %cond) {
224+
; CHECK-LABEL: @uadd_no_overflow_invalid1(
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; CHECK-NEXT: [[VAL:%.*]] = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 [[B:%.*]])
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; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
227+
; CHECK-NEXT: call void @use(i32 [[RES]])
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
229+
; CHECK: if.then:
230+
; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
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; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
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; CHECK-NEXT: ret i32 [[RES]]
234+
; CHECK: if.else:
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; 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:%.*]])
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; CHECK-NEXT: [[OV:%.*]] = extractvalue { i32, i1 } [[VAL]], 1
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; CHECK-NEXT: [[NOWRAP:%.*]] = xor i1 [[OV]], true
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; CHECK-NEXT: call void @use(i32 0)
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[NOWRAP]])
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; CHECK-NEXT: [[RES:%.*]] = extractvalue { i32, i1 } [[VAL]], 0
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; CHECK-NEXT: ret i32 [[RES]]
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;
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%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
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}
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declare void @use(i32)

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