llvm/test/Transforms/CodeGenPrepare/X86/overflow-intrinsics.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -codegenprepare -S < %s | FileCheck %s
; RUN: opt -enable-debugify -codegenprepare -S < %s 2>&1 | FileCheck %s -check-prefix=DEBUG

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"

define i64 @uaddo1(i64 %a, i64 %b) nounwind ssp {
; CHECK-LABEL: @uaddo1(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[B:%.*]], i64 [[A:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[Q:%.*]] = select i1 [[OV]], i64 [[B]], i64 42
; CHECK-NEXT:    ret i64 [[Q]]
;
  %add = add i64 %b, %a
  %cmp = icmp ult i64 %add, %a
  %Q = select i1 %cmp, i64 %b, i64 42
  ret i64 %Q
}

define i64 @uaddo2(i64 %a, i64 %b) nounwind ssp {
; CHECK-LABEL: @uaddo2(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[B:%.*]], i64 [[A:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[Q:%.*]] = select i1 [[OV]], i64 [[B]], i64 42
; CHECK-NEXT:    ret i64 [[Q]]
;
  %add = add i64 %b, %a
  %cmp = icmp ult i64 %add, %b
  %Q = select i1 %cmp, i64 %b, i64 42
  ret i64 %Q
}

define i64 @uaddo3(i64 %a, i64 %b) nounwind ssp {
; CHECK-LABEL: @uaddo3(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[B:%.*]], i64 [[A:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[Q:%.*]] = select i1 [[OV]], i64 [[B]], i64 42
; CHECK-NEXT:    ret i64 [[Q]]
;
  %add = add i64 %b, %a
  %cmp = icmp ugt i64 %b, %add
  %Q = select i1 %cmp, i64 %b, i64 42
  ret i64 %Q
}

define i64 @uaddo4(i64 %a, i64 %b, i1 %c) nounwind ssp {
; CHECK-LABEL: @uaddo4(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[NEXT:%.*]], label [[EXIT:%.*]]
; CHECK:       next:
; CHECK-NEXT:    [[TMP0:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[B:%.*]], i64 [[A:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP0]], 0
; CHECK-NEXT:    [[OV:%.*]] = extractvalue { i64, i1 } [[TMP0]], 1
; CHECK-NEXT:    [[Q:%.*]] = select i1 [[OV]], i64 [[B]], i64 42
; CHECK-NEXT:    ret i64 [[Q]]
; CHECK:       exit:
; CHECK-NEXT:    ret i64 0
;
entry:
  %add = add i64 %b, %a
  %cmp = icmp ugt i64 %b, %add
  br i1 %c, label %next, label %exit

next:
  %Q = select i1 %cmp, i64 %b, i64 42
  ret i64 %Q

exit:
  ret i64 0
}

define i64 @uaddo5(i64 %a, i64 %b, i64* %ptr, i1 %c) nounwind ssp {
; CHECK-LABEL: @uaddo5(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[B:%.*]], [[A:%.*]]
; CHECK-NEXT:    store i64 [[ADD]], i64* [[PTR:%.*]]
; CHECK-NEXT:    br i1 [[C:%.*]], label [[NEXT:%.*]], label [[EXIT:%.*]]
; CHECK:       next:
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ugt i64 [[B]], [[ADD]]
; CHECK-NEXT:    [[Q:%.*]] = select i1 [[TMP0]], i64 [[B]], i64 42
; CHECK-NEXT:    ret i64 [[Q]]
; CHECK:       exit:
; CHECK-NEXT:    ret i64 0
;
entry:
  %add = add i64 %b, %a
  store i64 %add, i64* %ptr
  %cmp = icmp ugt i64 %b, %add
  br i1 %c, label %next, label %exit

next:
  %Q = select i1 %cmp, i64 %b, i64 42
  ret i64 %Q

exit:
  ret i64 0
}

; When adding 1, the general pattern for add-overflow may be different due to icmp canonicalization.
; PR31754: https://bugs.llvm.org/show_bug.cgi?id=31754

define i1 @uaddo_i64_increment(i64 %x, i64* %p) {
; CHECK-LABEL: @uaddo_i64_increment(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[X:%.*]], i64 1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i64 %x, 1
  %ov = icmp eq i64 %a, 0
  store i64 %a, i64* %p
  ret i1 %ov
}

define i1 @uaddo_i8_increment_noncanonical_1(i8 %x, i8* %p) {
; CHECK-LABEL: @uaddo_i8_increment_noncanonical_1(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 1, i8 [[X:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i8, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i8, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i8 [[MATH]], i8* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i8 1, %x        ; commute
  %ov = icmp eq i8 %a, 0
  store i8 %a, i8* %p
  ret i1 %ov
}

define i1 @uaddo_i32_increment_noncanonical_2(i32 %x, i32* %p) {
; CHECK-LABEL: @uaddo_i32_increment_noncanonical_2(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[X:%.*]], i32 1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i32, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i32 [[MATH]], i32* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i32 %x, 1
  %ov = icmp eq i32 0, %a   ; commute
  store i32 %a, i32* %p
  ret i1 %ov
}

define i1 @uaddo_i16_increment_noncanonical_3(i16 %x, i16* %p) {
; CHECK-LABEL: @uaddo_i16_increment_noncanonical_3(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i16, i1 } @llvm.uadd.with.overflow.i16(i16 1, i16 [[X:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i16, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i16, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i16 [[MATH]], i16* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i16 1, %x        ; commute
  %ov = icmp eq i16 0, %a   ; commute
  store i16 %a, i16* %p
  ret i1 %ov
}

; The overflow check may be against the input rather than the sum.

define i1 @uaddo_i64_increment_alt(i64 %x, i64* %p) {
; CHECK-LABEL: @uaddo_i64_increment_alt(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[X:%.*]], i64 1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i64 %x, 1
  store i64 %a, i64* %p
  %ov = icmp eq i64 %x, -1
  ret i1 %ov
}

; Make sure insertion is done correctly based on dominance.

define i1 @uaddo_i64_increment_alt_dom(i64 %x, i64* %p) {
; CHECK-LABEL: @uaddo_i64_increment_alt_dom(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[X:%.*]], i64 1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %ov = icmp eq i64 %x, -1
  %a = add i64 %x, 1
  store i64 %a, i64* %p
  ret i1 %ov
}

; The overflow check may be against the input rather than the sum.

define i1 @uaddo_i64_decrement_alt(i64 %x, i64* %p) {
; CHECK-LABEL: @uaddo_i64_decrement_alt(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[X:%.*]], i64 -1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %a = add i64 %x, -1
  store i64 %a, i64* %p
  %ov = icmp ne i64 %x, 0
  ret i1 %ov
}

; Make sure insertion is done correctly based on dominance.

define i1 @uaddo_i64_decrement_alt_dom(i64 %x, i64* %p) {
; CHECK-LABEL: @uaddo_i64_decrement_alt_dom(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[X:%.*]], i64 -1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %ov = icmp ne i64 %x, 0
  %a = add i64 %x, -1
  store i64 %a, i64* %p
  ret i1 %ov
}

; No transform for illegal types.

define i1 @uaddo_i42_increment_illegal_type(i42 %x, i42* %p) {
; CHECK-LABEL: @uaddo_i42_increment_illegal_type(
; CHECK-NEXT:    [[A:%.*]] = add i42 [[X:%.*]], 1
; CHECK-NEXT:    [[OV:%.*]] = icmp eq i42 [[A]], 0
; CHECK-NEXT:    store i42 [[A]], i42* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV]]
;
  %a = add i42 %x, 1
  %ov = icmp eq i42 %a, 0
  store i42 %a, i42* %p
  ret i1 %ov
}

define i1 @usubo_ult_i64(i64 %x, i64 %y, i64* %p) {
; CHECK-LABEL: @usubo_ult_i64(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i64, i1 } @llvm.usub.with.overflow.i64(i64 [[X:%.*]], i64 [[Y:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = sub i64 %x, %y
  store i64 %s, i64* %p
  %ov = icmp ult i64 %x, %y
  ret i1 %ov
}

; Verify insertion point for single-BB. Toggle predicate.

define i1 @usubo_ugt_i32(i32 %x, i32 %y, i32* %p) {
; CHECK-LABEL: @usubo_ugt_i32(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.usub.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i32, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i32 [[MATH]], i32* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %ov = icmp ugt i32 %y, %x
  %s = sub i32 %x, %y
  store i32 %s, i32* %p
  ret i1 %ov
}

; Constant operand should match.

define i1 @usubo_ugt_constant_op0_i8(i8 %x, i8* %p) {
; CHECK-LABEL: @usubo_ugt_constant_op0_i8(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 42, i8 [[X:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i8, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i8, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i8 [[MATH]], i8* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = sub i8 42, %x
  %ov = icmp ugt i8 %x, 42
  store i8 %s, i8* %p
  ret i1 %ov
}

; Compare with constant operand 0 is canonicalized by commuting, but verify match for non-canonical form.

define i1 @usubo_ult_constant_op0_i16(i16 %x, i16* %p) {
; CHECK-LABEL: @usubo_ult_constant_op0_i16(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i16, i1 } @llvm.usub.with.overflow.i16(i16 43, i16 [[X:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i16, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i16, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i16 [[MATH]], i16* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = sub i16 43, %x
  %ov = icmp ult i16 43, %x
  store i16 %s, i16* %p
  ret i1 %ov
}

; Subtract with constant operand 1 is canonicalized to add.

define i1 @usubo_ult_constant_op1_i16(i16 %x, i16* %p) {
; CHECK-LABEL: @usubo_ult_constant_op1_i16(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i16, i1 } @llvm.usub.with.overflow.i16(i16 [[X:%.*]], i16 44)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i16, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i16, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i16 [[MATH]], i16* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = add i16 %x, -44
  %ov = icmp ult i16 %x, 44
  store i16 %s, i16* %p
  ret i1 %ov
}

define i1 @usubo_ugt_constant_op1_i8(i8 %x, i8* %p) {
; CHECK-LABEL: @usubo_ugt_constant_op1_i8(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[X:%.*]], i8 45)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i8, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i8, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i8 [[MATH]], i8* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %ov = icmp ugt i8 45, %x
  %s = add i8 %x, -45
  store i8 %s, i8* %p
  ret i1 %ov
}

; Special-case: subtract 1 changes the compare predicate and constant.

define i1 @usubo_eq_constant1_op1_i32(i32 %x, i32* %p) {
; CHECK-LABEL: @usubo_eq_constant1_op1_i32(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.usub.with.overflow.i32(i32 [[X:%.*]], i32 1)
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i32, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i32 [[MATH]], i32* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = add i32 %x, -1
  %ov = icmp eq i32 %x, 0
  store i32 %s, i32* %p
  ret i1 %ov
}

; Special-case: subtract from 0 (negate) changes the compare predicate.

define i1 @usubo_ne_constant0_op1_i32(i32 %x, i32* %p) {
; CHECK-LABEL: @usubo_ne_constant0_op1_i32(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.usub.with.overflow.i32(i32 0, i32 [[X:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i32, i1 } [[TMP1]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    store i32 [[MATH]], i32* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
  %s = sub i32 0, %x
  %ov = icmp ne i32 %x, 0
  store i32 %s, i32* %p
  ret i1 %ov
}

; Verify insertion point for multi-BB.

declare void @call(i1)

define i1 @usubo_ult_sub_dominates_i64(i64 %x, i64 %y, i64* %p, i1 %cond) {
; CHECK-LABEL: @usubo_ult_sub_dominates_i64(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T:%.*]], label [[F:%.*]]
; CHECK:       t:
; CHECK-NEXT:    [[TMP0:%.*]] = call { i64, i1 } @llvm.usub.with.overflow.i64(i64 [[X:%.*]], i64 [[Y:%.*]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP0]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP0]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    br i1 [[COND]], label [[END:%.*]], label [[F]]
; CHECK:       f:
; CHECK-NEXT:    ret i1 [[COND]]
; CHECK:       end:
; CHECK-NEXT:    ret i1 [[OV1]]
;
entry:
  br i1 %cond, label %t, label %f

t:
  %s = sub i64 %x, %y
  store i64 %s, i64* %p
  br i1 %cond, label %end, label %f

f:
  ret i1 %cond

end:
  %ov = icmp ult i64 %x, %y
  ret i1 %ov
}

define i1 @usubo_ult_cmp_dominates_i64(i64 %x, i64 %y, i64* %p, i1 %cond) {
; CHECK-LABEL: @usubo_ult_cmp_dominates_i64(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T:%.*]], label [[F:%.*]]
; CHECK:       t:
; CHECK-NEXT:    [[OV:%.*]] = icmp ult i64 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    call void @call(i1 [[OV]])
; CHECK-NEXT:    br i1 [[OV]], label [[END:%.*]], label [[F]]
; CHECK:       f:
; CHECK-NEXT:    ret i1 [[COND]]
; CHECK:       end:
; CHECK-NEXT:    [[TMP0:%.*]] = call { i64, i1 } @llvm.usub.with.overflow.i64(i64 [[X]], i64 [[Y]])
; CHECK-NEXT:    [[MATH:%.*]] = extractvalue { i64, i1 } [[TMP0]], 0
; CHECK-NEXT:    [[OV1:%.*]] = extractvalue { i64, i1 } [[TMP0]], 1
; CHECK-NEXT:    store i64 [[MATH]], i64* [[P:%.*]]
; CHECK-NEXT:    ret i1 [[OV1]]
;
entry:
  br i1 %cond, label %t, label %f

t:
  %ov = icmp ult i64 %x, %y
  call void @call(i1 %ov)
  br i1 %ov, label %end, label %f

f:
  ret i1 %cond

end:
  %s = sub i64 %x, %y
  store i64 %s, i64* %p
  ret i1 %ov
}

; Verify that crazy/non-canonical code does not crash.

define void @bar() {
; CHECK-LABEL: @bar(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 1, -1
; CHECK-NEXT:    [[FROMBOOL:%.*]] = zext i1 [[CMP]] to i8
; CHECK-NEXT:    unreachable
;
  %cmp = icmp eq i64 1, -1
  %frombool = zext i1 %cmp to i8
  unreachable
}

define void @foo() {
; CHECK-LABEL: @foo(
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i64 1, 1
; CHECK-NEXT:    [[CONV:%.*]] = trunc i64 [[SUB]] to i32
; CHECK-NEXT:    unreachable
;
  %sub = add nsw i64 1, 1
  %conv = trunc i64 %sub to i32
  unreachable
}

; Similarly for usubo.

define i1 @bar2() {
; CHECK-LABEL: @bar2(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 1, 0
; CHECK-NEXT:    ret i1 [[CMP]]
;
  %cmp = icmp eq i64 1, 0
  ret i1 %cmp
}

define i64 @foo2(i8 *%p) {
; CHECK-LABEL: @foo2(
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i64 1, -1
; CHECK-NEXT:    ret i64 [[SUB]]
;
  %sub = add nsw i64 1, -1
  ret i64 %sub
}

; Avoid hoisting a math op into a dominating block which would
; increase the critical path.

define void @PR41129(i64* %p64) {
; CHECK-LABEL: @PR41129(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[KEY:%.*]] = load i64, i64* [[P64:%.*]], align 8
; CHECK-NEXT:    [[COND17:%.*]] = icmp eq i64 [[KEY]], 0
; CHECK-NEXT:    br i1 [[COND17]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK:       false:
; CHECK-NEXT:    [[ANDVAL:%.*]] = and i64 [[KEY]], 7
; CHECK-NEXT:    store i64 [[ANDVAL]], i64* [[P64]]
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       true:
; CHECK-NEXT:    [[SVALUE:%.*]] = add i64 [[KEY]], -1
; CHECK-NEXT:    store i64 [[SVALUE]], i64* [[P64]]
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %key = load i64, i64* %p64, align 8
  %cond17 = icmp eq i64 %key, 0
  br i1 %cond17, label %true, label %false

false:
  %andval = and i64 %key, 7
  store i64 %andval, i64* %p64
  br label %exit

true:
  %svalue = add i64 %key, -1
  store i64 %svalue, i64* %p64
  br label %exit

exit:
  ret void
}

; Check that every instruction inserted by -codegenprepare has a debug location.
; DEBUG: CheckModuleDebugify: PASS