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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
define i16 @sext_shl_trunc_same_size(i16 %x, i32 %y) {
; CHECK-LABEL: @sext_shl_trunc_same_size(
; CHECK-NEXT: [[CONV1:%.*]] = zext i16 [[X:%.*]] to i32
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV1]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[SHL]] to i16
; CHECK-NEXT: ret i16 [[T]]
;
%conv = sext i16 %x to i32
%shl = shl i32 %conv, %y
%t = trunc i32 %shl to i16
ret i16 %t
}
define i5 @sext_shl_trunc_smaller(i16 %x, i32 %y) {
; CHECK-LABEL: @sext_shl_trunc_smaller(
; CHECK-NEXT: [[CONV1:%.*]] = zext i16 [[X:%.*]] to i32
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV1]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[SHL]] to i5
; CHECK-NEXT: ret i5 [[T]]
;
%conv = sext i16 %x to i32
%shl = shl i32 %conv, %y
%t = trunc i32 %shl to i5
ret i5 %t
}
; negative test - demanding 1 high-bit too many to change the extend
define i17 @sext_shl_trunc_larger(i16 %x, i32 %y) {
; CHECK-LABEL: @sext_shl_trunc_larger(
; CHECK-NEXT: [[CONV:%.*]] = sext i16 [[X:%.*]] to i32
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[SHL]] to i17
; CHECK-NEXT: ret i17 [[T]]
;
%conv = sext i16 %x to i32
%shl = shl i32 %conv, %y
%t = trunc i32 %shl to i17
ret i17 %t
}
define i32 @sext_shl_mask(i16 %x, i32 %y) {
; CHECK-LABEL: @sext_shl_mask(
; CHECK-NEXT: [[CONV1:%.*]] = zext i16 [[X:%.*]] to i32
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV1]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = and i32 [[SHL]], 65535
; CHECK-NEXT: ret i32 [[T]]
;
%conv = sext i16 %x to i32
%shl = shl i32 %conv, %y
%t = and i32 %shl, 65535
ret i32 %t
}
; negative test - demanding a bit that could change with sext
define i32 @sext_shl_mask_higher(i16 %x, i32 %y) {
; CHECK-LABEL: @sext_shl_mask_higher(
; CHECK-NEXT: [[CONV:%.*]] = sext i16 [[X:%.*]] to i32
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = and i32 [[SHL]], 65536
; CHECK-NEXT: ret i32 [[T]]
;
%conv = sext i16 %x to i32
%shl = shl i32 %conv, %y
%t = and i32 %shl, 65536
ret i32 %t
}
; May need some, but not all of the bits set by the 'or'.
define i32 @set_shl_mask(i32 %x, i32 %y) {
; CHECK-LABEL: @set_shl_mask(
; CHECK-NEXT: [[Z:%.*]] = or i32 [[X:%.*]], 65537
; CHECK-NEXT: [[S:%.*]] = shl i32 [[Z]], [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = and i32 [[S]], 65536
; CHECK-NEXT: ret i32 [[R]]
;
%z = or i32 %x, 196609
%s = shl i32 %z, %y
%r = and i32 %s, 65536
ret i32 %r
}
; PR50341
define i8 @must_drop_poison(i32 %x, i32 %y) {
; CHECK-LABEL: @must_drop_poison(
; CHECK-NEXT: [[S:%.*]] = shl i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[S]] to i8
; CHECK-NEXT: ret i8 [[T]]
;
%a = and i32 %x, 255
%s = shl nuw nsw i32 %a, %y
%t = trunc i32 %s to i8
ret i8 %t
}
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