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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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72
test/Transforms/InstSimplify/compare.ll
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@@ -333,14 +333,46 @@ define i1 @or(i32 %x) {
; CHECK: ret i1 false
}
define i1 @shl(i32 %x) {
; CHECK-LABEL: @shl(
define i1 @shl1(i32 %x) {
; CHECK-LABEL: @shl1(
%s = shl i32 1, %x
%c = icmp eq i32 %s, 0
ret i1 %c
; CHECK: ret i1 false
}
define i1 @shl2(i32 %X) {
; CHECK: @shl2
%sub = shl nsw i32 -1, %X
%cmp = icmp eq i32 %sub, 31
ret i1 %cmp
; CHECK-NEXT: ret i1 false
}
define i1 @shl3(i32 %X) {
; CHECK: @shl3
%sub = shl nuw i32 4, %X
%cmp = icmp eq i32 %sub, 31
ret i1 %cmp
; CHECK-NEXT: ret i1 false
}
define i1 @shl4(i32 %X) {
; CHECK: @shl4
%sub = shl nsw i32 -1, %X
%cmp = icmp sle i32 %sub, -1
ret i1 %cmp
; CHECK-NEXT: ret i1 true
}
define i1 @shl5(i32 %X) {
; CHECK: @shl5
%sub = shl nuw i32 4, %X
%cmp = icmp ugt i32 %sub, 3
ret i1 %cmp
; CHECK-NEXT: ret i1 true
}
define i1 @lshr1(i32 %x) {
; CHECK-LABEL: @lshr1(
%s = lshr i32 -1, %x
@@ -1009,3 +1041,39 @@ define i1 @icmp_shl_nsw_1(i64 %a) {
; CHECK-LABEL: @icmp_shl_nsw_1
; CHECK-NEXT: ret i1 true
}
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_ugt_2147483648(
; CHECK-NEXT: ret i1 false
}
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_ule_2147483648(
; CHECK-NEXT: ret i1 true
}
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_eq_31(
; CHECK-NEXT: ret i1 false
}
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_ne_31(
; CHECK-NEXT: ret i1 true
}