derek.holloway
7502bf64a4
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96 lines
3.5 KiB
LLVM
96 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -passes=instcombine -S %s | FileCheck %s
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; Regression case: atomicrmw sub with variable is left unchanged
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define i64 @fn_sub(ptr %a, i64 %n) {
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; CHECK-LABEL: define i64 @fn_sub(
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; CHECK-SAME: ptr [[A:%.*]], i64 [[N:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw sub ptr [[A]], i64 [[N]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%1 = atomicrmw sub ptr %a, i64 %n monotonic
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ret i64 %1
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}
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; Canonicalize atomicrmw add(ptr, neg(n)) -> atomicrmw sub(ptr, n)
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define i64 @fn_add(ptr %a, i64 %n) {
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; CHECK-LABEL: define i64 @fn_add(
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; CHECK-SAME: ptr [[A:%.*]], i64 [[N:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw sub ptr [[A]], i64 [[N]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%sub = sub i64 0, %n
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%1 = atomicrmw add ptr %a, i64 %sub monotonic
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ret i64 %1
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}
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; Canonicalize atomicrmw add(ptr, neg(n)) -> atomicrmw sub(ptr, n)
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; even when the negation is nsw
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define i64 @fn_adds(ptr %a, i64 %n) {
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; CHECK-LABEL: define i64 @fn_adds(
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; CHECK-SAME: ptr [[A:%.*]], i64 [[N:%.*]]) {
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; CHECK-NEXT: [[OLD:%.*]] = atomicrmw sub ptr [[A]], i64 [[N]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[OLD]]
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;
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%neg = sub nsw i64 0, %n
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%old = atomicrmw add ptr %a, i64 %neg monotonic
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ret i64 %old
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}
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; Canonicalize atomicrmw sub(ptr, neg(n)) -> atomicrmw add(ptr, n)
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define i64 @fn_sub_neg(ptr %a, i64 %n) {
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; CHECK-LABEL: define i64 @fn_sub_neg(
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; CHECK-SAME: ptr [[A:%.*]], i64 [[N:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw add ptr [[A]], i64 [[N]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%neg = sub i64 0, %n
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%1 = atomicrmw sub ptr %a, i64 %neg monotonic
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ret i64 %1
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}
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; Don't canonicalize if the negated value has multiple uses -- as that would add an extra instruction.
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define i64 @fn_add_1_with_use(ptr %a, i64 %n) {
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; CHECK-LABEL: define i64 @fn_add_1_with_use(
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; CHECK-SAME: ptr [[A:%.*]], i64 [[N:%.*]]) {
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; CHECK-NEXT: [[ADD:%.*]] = add i64 [[N]], 1
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; CHECK-NEXT: call void @use(i64 [[ADD]])
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw add ptr [[A]], i64 [[ADD]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%add = add i64 %n, 1
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call void @use(i64 %add)
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%1 = atomicrmw add ptr %a, i64 %add monotonic
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ret i64 %1
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}
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; Don't canonicalize atomicrmw sub(ptr, sub(a, b)) -> atomicrmw add(ptr, sub(b, a)),
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; as that would create an infinite loop by continuously swapping the sub operands.
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define i64 @fn_sub_of_two_vars(ptr %p, i64 %a, i64 %b) {
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; CHECK-LABEL: define i64 @fn_sub_of_two_vars(
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; CHECK-SAME: ptr [[P:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
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; CHECK-NEXT: [[SUB:%.*]] = sub i64 [[A]], [[B]]
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw sub ptr [[P]], i64 [[SUB]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%sub = sub i64 %a, %b
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%1 = atomicrmw sub ptr %p, i64 %sub monotonic
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ret i64 %1
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}
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; Don't canonicalize atomicrmw add(ptr, sub(a, b)) -> atomicrmw sub(ptr, sub(b, a)),
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; as that would create an infinite loop by continuously swapping the sub operands.
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define i64 @fn_add_of_two_vars(ptr %p, i64 %a, i64 %b) {
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; CHECK-LABEL: define i64 @fn_add_of_two_vars(
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; CHECK-SAME: ptr [[P:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
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; CHECK-NEXT: [[SUB:%.*]] = sub i64 [[A]], [[B]]
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; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw add ptr [[P]], i64 [[SUB]] monotonic, align 8
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%sub = sub i64 %a, %b
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%1 = atomicrmw add ptr %p, i64 %sub monotonic
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ret i64 %1
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}
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declare void @use(i64)
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