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[InstCombine] Added regression test to narrow-swich.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293018 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gerolf Hoflehner 2017-01-25 04:34:59 +00:00
parent fe49b7173b
commit 6109735ddc
1 changed files with 42 additions and 0 deletions
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42
test/Transforms/InstCombine/narrow-switch.ll
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@ -164,3 +164,45 @@ case124:
ret i8 5
}
; Make sure the arithmetic evaluation of the switch
; condition is evaluated on the original type
define i32 @trunc32to16(i32 %a0) #0 {
; ALL-LABEL: @trunc32to16(
; ALL: switch i16
; ALL-NEXT: i16 63, label %sw.bb
; ALL-NEXT: i16 1, label %sw.bb1
; ALL-NEXT: i16 100, label %sw.bb2
; ALL-NEXT: ]
;
entry:
%retval = alloca i32, align 4
%xor = xor i32 %a0, 1034460917
%shr = lshr i32 %xor, 16
%add = add i32 %shr, -917677090
switch i32 %add, label %sw.epilog [
i32 -917677027, label %sw.bb
i32 -917677089, label %sw.bb1
i32 -917676990, label %sw.bb2
]
sw.bb: ; preds = %entry
store i32 90, i32* %retval, align 4
br label %return
sw.bb1: ; preds = %entry
store i32 91, i32* %retval, align 4
br label %return
sw.bb2: ; preds = %entry
store i32 92, i32* %retval, align 4
br label %return
sw.epilog: ; preds = %entry
store i32 113, i32* %retval, align 4
br label %return
return: ; preds = %sw.epilog, %sw.bb2,
%rval = load i32, i32* %retval, align 4
ret i32 %rval
}