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[CVP][NFC] Revisit sext vs. zext test 

llvm-svn: 374111
This commit is contained in:
Roman Lebedev 2019-10-08 20:29:36 +00:00
parent 49b398f0e9
commit 347f6a770b
1 changed files with 33 additions and 5 deletions
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38
llvm/test/Transforms/CorrelatedValuePropagation/sext.ll
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@ -15,7 +15,7 @@ define void @test1(i32 %n) {
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[A:%.*]] = phi i32 [ [[N:%.*]], [[ENTRY:%.*]] ], [ [[EXT:%.*]], [[FOR_BODY:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[EXT_WIDE:%.*]] = sext i32 [[A]] to i64
@ -30,7 +30,7 @@ entry:
for.cond: ; preds = %for.body, %entry
%a = phi i32 [ %n, %entry ], [ %ext, %for.body ]
%cmp = icmp sgt i32 %a, 1
%cmp = icmp sgt i32 %a, -1
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
@ -43,7 +43,7 @@ for.end: ; preds = %for.cond
ret void
}
;; Negative test to show transform doesn't happen unless n > 0.
;; Negative test to show transform doesn't happen unless n >= 0.
define void @test2(i32 %n) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
@ -82,7 +82,7 @@ for.end: ; preds = %for.cond
define void @test3(i32 %n) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[BB:%.*]], label [[EXIT:%.*]]
; CHECK: bb:
; CHECK-NEXT: [[EXT_WIDE:%.*]] = sext i32 [[N]] to i64
@ -93,7 +93,35 @@ define void @test3(i32 %n) {
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp sgt i32 %n, 0
%cmp = icmp sgt i32 %n, -1
br i1 %cmp, label %bb, label %exit
bb:
%ext.wide = sext i32 %n to i64
call void @use64(i64 %ext.wide)
%ext = trunc i64 %ext.wide to i32
br label %exit
exit:
ret void
}
;; Non looping negative test case.
define void @test4(i32 %n) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[N:%.*]], -2
; CHECK-NEXT: br i1 [[CMP]], label [[BB:%.*]], label [[EXIT:%.*]]
; CHECK: bb:
; CHECK-NEXT: [[EXT_WIDE:%.*]] = sext i32 [[N]] to i64
; CHECK-NEXT: call void @use64(i64 [[EXT_WIDE]])
; CHECK-NEXT: [[EXT:%.*]] = trunc i64 [[EXT_WIDE]] to i32
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp sgt i32 %n, -2
br i1 %cmp, label %bb, label %exit
bb: