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Revert "Canonicalize min/max expressions correctly."

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This reverts r237453 - it was causing timeouts on some bots. Reverting
while I investigate (it's probably InstCombine fighting itself...)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2015-05-15 17:45:09 +00:00
parent 7363a8bcdd
commit c683eb2d37
4 changed files with 7 additions and 120 deletions
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73
test/Transforms/InstCombine/minmax-fold.ll
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@@ -1,73 +0,0 @@
; RUN: opt -S -instcombine < %s | FileCheck %s
; CHECK-LABEL: @t1
; CHECK-NEXT: icmp
; CHECK-NEXT: select
; CHECK-NEXT: sext
define i64 @t1(i32 %a) {
; This is the canonical form for a type-changing min/max.
%1 = icmp slt i32 %a, 5
%2 = select i1 %1, i32 %a, i32 5
%3 = sext i32 %2 to i64
ret i64 %3
}
; CHECK-LABEL: @t2
; CHECK-NEXT: icmp
; CHECK-NEXT: select
; CHECK-NEXT: sext
define i64 @t2(i32 %a) {
; Check this is converted into canonical form, as above.
%1 = icmp slt i32 %a, 5
%2 = sext i32 %a to i64
%3 = select i1 %1, i64 %2, i64 5
ret i64 %3
}
; CHECK-LABEL: @t3
; CHECK-NEXT: icmp
; CHECK-NEXT: select
; CHECK-NEXT: zext
define i64 @t3(i32 %a) {
; Same as @t2, with flipped operands and zext instead of sext.
%1 = icmp ult i32 %a, 5
%2 = zext i32 %a to i64
%3 = select i1 %1, i64 5, i64 %2
ret i64 %3
}
; CHECK-LABEL: @t4
; CHECK-NEXT: icmp
; CHECK-NEXT: select
; CHECK-NEXT: trunc
define i32 @t4(i64 %a) {
; Same again, with trunc.
%1 = icmp slt i64 %a, 5
%2 = trunc i64 %a to i32
%3 = select i1 %1, i32 %2, i32 5
ret i32 %3
}
; CHECK-LABEL: @t5
; CHECK-NEXT: icmp
; CHECK-NEXT: zext
; CHECK-NEXT: select
define i64 @t5(i32 %a) {
; Same as @t3, but with mismatched signedness between icmp and zext.
; InstCombine should leave this alone.
%1 = icmp slt i32 %a, 5
%2 = zext i32 %a to i64
%3 = select i1 %1, i64 5, i64 %2
ret i64 %3
}
; CHECK-LABEL: @t6
; CHECK-NEXT: icmp
; CHECK-NEXT: select
; CHECK-NEXT: sitofp
define float @t6(i32 %a) {
%1 = icmp slt i32 %a, 0
%2 = select i1 %1, i32 %a, i32 0
%3 = sitofp i32 %2 to float
ret float %3
}