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llvm-mirror/test/Transforms/InstSimplify/cmp_ext.ll
Nikita Popov d3333eef26 [InstSimplify] Simplify comparison between zext(x) and sext(x) 
This is picking up a loose thread from D69006: We can simplify
(zext x) ule (sext x) and (zext x) sge (sext x) to true, with
various permutations. Oddly, SCEV knows about this identity,
but nothing on the IR level does.

Differential Revision: https://reviews.llvm.org/D83081
2020-07-04 11:03:00 +02:00

233 lines
6.1 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i1 @zext_uge_sext(i32 %x) {
; CHECK-LABEL: @zext_uge_sext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp uge i64 [[ZEXT]], [[SEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp uge i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_ugt_sext(i32 %x) {
; CHECK-LABEL: @zext_ugt_sext(
; CHECK-NEXT: ret i1 false
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ugt i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_ult_sext(i32 %x) {
; CHECK-LABEL: @zext_ult_sext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[ZEXT]], [[SEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ult i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_ule_sext(i32 %x) {
; CHECK-LABEL: @zext_ule_sext(
; CHECK-NEXT: ret i1 true
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ule i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_sge_sext(i32 %x) {
; CHECK-LABEL: @zext_sge_sext(
; CHECK-NEXT: ret i1 true
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sge i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_sgt_sext(i32 %x) {
; CHECK-LABEL: @zext_sgt_sext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i64 [[ZEXT]], [[SEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sgt i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_slt_sext(i32 %x) {
; CHECK-LABEL: @zext_slt_sext(
; CHECK-NEXT: ret i1 false
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp slt i64 %zext, %sext
ret i1 %cmp
}
define i1 @zext_sle_sext(i32 %x) {
; CHECK-LABEL: @zext_sle_sext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp sle i64 [[ZEXT]], [[SEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sle i64 %zext, %sext
ret i1 %cmp
}
define i1 @sext_uge_zext(i32 %x) {
; CHECK-LABEL: @sext_uge_zext(
; CHECK-NEXT: ret i1 true
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp uge i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_ugt_zext(i32 %x) {
; CHECK-LABEL: @sext_ugt_zext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i64 [[SEXT]], [[ZEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ugt i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_ult_zext(i32 %x) {
; CHECK-LABEL: @sext_ult_zext(
; CHECK-NEXT: ret i1 false
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ult i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_ule_zext(i32 %x) {
; CHECK-LABEL: @sext_ule_zext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp ule i64 [[SEXT]], [[ZEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp ule i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_sge_zext(i32 %x) {
; CHECK-LABEL: @sext_sge_zext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i64 [[SEXT]], [[ZEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sge i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_sgt_zext(i32 %x) {
; CHECK-LABEL: @sext_sgt_zext(
; CHECK-NEXT: ret i1 false
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sgt i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_slt_zext(i32 %x) {
; CHECK-LABEL: @sext_slt_zext(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[X]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i64 [[SEXT]], [[ZEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp slt i64 %sext, %zext
ret i1 %cmp
}
define i1 @sext_sle_zext(i32 %x) {
; CHECK-LABEL: @sext_sle_zext(
; CHECK-NEXT: ret i1 true
;
%sext = sext i32 %x to i64
%zext = zext i32 %x to i64
%cmp = icmp sle i64 %sext, %zext
ret i1 %cmp
}
define <4 x i1> @zext_ugt_sext_vec(<4 x i32> %x) {
; CHECK-LABEL: @zext_ugt_sext_vec(
; CHECK-NEXT: ret <4 x i1> zeroinitializer
;
%sext = sext <4 x i32> %x to <4 x i64>
%zext = zext <4 x i32> %x to <4 x i64>
%cmp = icmp ugt <4 x i64> %zext, %sext
ret <4 x i1> %cmp
}
define <4 x i1> @sext_ult_zext_vec(<4 x i32> %x) {
; CHECK-LABEL: @sext_ult_zext_vec(
; CHECK-NEXT: ret <4 x i1> zeroinitializer
;
%sext = sext <4 x i32> %x to <4 x i64>
%zext = zext <4 x i32> %x to <4 x i64>
%cmp = icmp ult <4 x i64> %sext, %zext
ret <4 x i1> %cmp
}
define i1 @zext_ugt_sext_different_operand(i32 %x, i32 %y) {
; CHECK-LABEL: @zext_ugt_sext_different_operand(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[Y:%.*]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i64 [[ZEXT]], [[SEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %y to i64
%cmp = icmp ugt i64 %zext, %sext
ret i1 %cmp
}
define i1 @sext_ult_zext_different_operand(i32 %x, i32 %y) {
; CHECK-LABEL: @sext_ult_zext_different_operand(
; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[Y:%.*]] to i64
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[SEXT]], [[ZEXT]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%sext = sext i32 %x to i64
%zext = zext i32 %y to i64
%cmp = icmp ult i64 %sext, %zext
ret i1 %cmp
}
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