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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -reassociate -dce -S | FileCheck %s
; PR12985
; Verify the nsw flags are preserved when converting shl to mul.
define i32 @shl_to_mul_nsw(i32 %i) {
;
; CHECK-LABEL: @shl_to_mul_nsw(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[I:%.*]], -2147483648
; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
; CHECK-NEXT: ret i32 [[MUL2]]
;
entry:
%mul = shl nsw i32 %i, 31
%mul2 = add i32 %mul, 1
ret i32 %mul2
}
define i32 @shl_to_mul_nsw_2(i32 %i) {
;
; CHECK-LABEL: @shl_to_mul_nsw_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i32 [[I:%.*]], 1073741824
; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
; CHECK-NEXT: ret i32 [[MUL2]]
;
entry:
%mul = shl nsw i32 %i, 30
%mul2 = add i32 %mul, 1
ret i32 %mul2
}
define i32 @shl_to_mul_nuw(i32 %i) {
;
; CHECK-LABEL: @shl_to_mul_nuw(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[MUL:%.*]] = mul nuw i32 [[I:%.*]], 4
; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
; CHECK-NEXT: ret i32 [[MUL2]]
;
entry:
%mul = shl nuw i32 %i, 2
%mul2 = add i32 %mul, 1
ret i32 %mul2
}
define i32 @shl_to_mul_nuw_nsw(i32 %i) {
;
; CHECK-LABEL: @shl_to_mul_nuw_nsw(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i32 [[I:%.*]], 4
; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
; CHECK-NEXT: ret i32 [[MUL2]]
;
entry:
%mul = shl nuw nsw i32 %i, 2
%mul2 = add i32 %mul, 1
ret i32 %mul2
}
define i32 @shl_to_mul_nuw_nsw_bitwidth_m1(i32 %i) {
;
; CHECK-LABEL: @shl_to_mul_nuw_nsw_bitwidth_m1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i32 [[I:%.*]], -2147483648
; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
; CHECK-NEXT: ret i32 [[MUL2]]
;
entry:
%mul = shl nuw nsw i32 %i, 31
%mul2 = add i32 %mul, 1
ret i32 %mul2
}
define i2 @pr23926(i2 %X1, i2 %X2) {
;
; CHECK-LABEL: @pr23926(
; CHECK-NEXT: [[X1_NEG:%.*]] = sub i2 0, [[X1:%.*]]
; CHECK-NEXT: [[ADD_NEG:%.*]] = add i2 [[X1_NEG]], -1
; CHECK-NEXT: [[SUB:%.*]] = add i2 [[ADD_NEG]], [[X2:%.*]]
; CHECK-NEXT: ret i2 [[SUB]]
;
%add = add nuw i2 %X1, 1
%sub = sub nuw nsw i2 %X2, %add
ret i2 %sub
}
|
