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InstSimplify: Move a transform from InstCombine to InstSimplify

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Several combines involving icmp (shl C2, %X) C1 can be simplified
without introducing any new instructions.  Move them to InstSimplify;
while we are at it, make them more powerful.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216642 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-08-28 03:34:28 +00:00
parent 4a76317ebb
commit b11fff1d8a
4 changed files with 105 additions and 44 deletions
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32
test/Transforms/InstCombine/icmp.ll
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@@ -1148,22 +1148,6 @@ define i1 @icmp_shl_1_V_eq_32(i32 %V) {
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_eq_31(
; CHECK-NEXT: ret i1 false
define i1 @icmp_shl_1_V_eq_31(i32 %V) {
%shl = shl i32 1, %V
%cmp = icmp eq i32 %shl, 31
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_ne_31(
; CHECK-NEXT: ret i1 true
define i1 @icmp_shl_1_V_ne_31(i32 %V) {
%shl = shl i32 1, %V
%cmp = icmp ne i32 %shl, 31
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_ult_30(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ult i32 %V, 5
; CHECK-NEXT: ret i1 [[CMP]]
@@ -1209,22 +1193,6 @@ define i1 @icmp_shl_1_V_uge_2147483648(i32 %V) {
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_ugt_2147483648(
; CHECK-NEXT: ret i1 false
define i1 @icmp_shl_1_V_ugt_2147483648(i32 %V) {
%shl = shl i32 1, %V
%cmp = icmp ugt i32 %shl, 2147483648
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_ule_2147483648(
; CHECK-NEXT: ret i1 true
define i1 @icmp_shl_1_V_ule_2147483648(i32 %V) {
%shl = shl i32 1, %V
%cmp = icmp ule i32 %shl, 2147483648
ret i1 %cmp
}
; CHECK-LABEL: @icmp_shl_1_V_ult_2147483648(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %V, 31
; CHECK-NEXT: ret i1 [[CMP]]