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X86: Generalize the x << (y & const) optimization to also catch masks with more set bits set than 31 or 63.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148024 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-01-12 12:41:34 +00:00
parent e5dafc3956
commit fb418bab97
2 changed files with 40 additions and 24 deletions
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18
test/CodeGen/X86/shift-and.ll
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@@ -1,4 +1,4 @@
; RUN: llc < %s -march=x86 | grep and | count 1
; RUN: llc < %s -march=x86 | grep and | count 2
; RUN: llc < %s -march=x86-64 | not grep and
define i32 @t1(i32 %t, i32 %val) nounwind {
@@ -7,9 +7,15 @@ define i32 @t1(i32 %t, i32 %val) nounwind {
ret i32 %res
}
define i32 @t2(i32 %t, i32 %val) nounwind {
%shamt = and i32 %t, 63
%res = shl i32 %val, %shamt
ret i32 %res
}
@X = internal global i16 0
define void @t2(i16 %t) nounwind {
define void @t3(i16 %t) nounwind {
%shamt = and i16 %t, 31
%tmp = load i16* @X
%tmp1 = ashr i16 %tmp, %shamt
@@ -17,8 +23,14 @@ define void @t2(i16 %t) nounwind {
ret void
}
define i64 @t3(i64 %t, i64 %val) nounwind {
define i64 @t4(i64 %t, i64 %val) nounwind {
%shamt = and i64 %t, 63
%res = lshr i64 %val, %shamt
ret i64 %res
}
define i64 @t5(i64 %t, i64 %val) nounwind {
%shamt = and i64 %t, 191
%res = lshr i64 %val, %shamt
ret i64 %res
}