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[InstCombine] add explanatory comments to tests; NFC 

llvm-svn: 292063
This commit is contained in:
Sanjay Patel 2017-01-15 16:22:26 +00:00
parent ed5eb93384
commit fba2df8d0f
1 changed files with 6 additions and 0 deletions
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6
llvm/test/Transforms/InstCombine/signext.ll
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@ -61,6 +61,10 @@ define i32 @test5(i32 %x) {
ret i32 %tmp.4
}
; If the shift amount equals the difference in width of the destination
; and source scalar types:
; ashr (shl (zext X), C), C --> sext X
define i32 @test6(i16 %P) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[TMP_5:%.*]] = sext i16 %P to i32
@ -72,6 +76,8 @@ define i32 @test6(i16 %P) {
ret i32 %tmp.5
}
; FIXME: Vectors should get the same fold as above.
define <2 x i32> @test6_splat_vec(<2 x i12> %P) {
; CHECK-LABEL: @test6_splat_vec(
; CHECK-NEXT: [[Z:%.*]] = zext <2 x i12> %P to <2 x i32>