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bef37376be
two elements match or don't match with two comparisons. For
example, the testcase compiles into:
define i1 @test5(i32 %X) {
%1 = icmp eq i32 %X, 2 ; <i1> [#uses=1]
%2 = icmp eq i32 %X, 7 ; <i1> [#uses=1]
%R = or i1 %1, %2 ; <i1> [#uses=1]
ret i1 %R
}
This generalizes the previous xforms when the array is larger than
64 elements (and this case matches) and generates better code for
cases where it overlaps with the magic bitshift case.
This generalizes more cases than you might expect. For example,
400.perlbmk has:
@PL_utf8skip = constant [256 x i8] c"\01\01\01\...
%15 = icmp ult i8 %7, 7
403.gcc has:
@rid_to_yy = internal constant [114 x i16] [i16 259, i16 260, ...
%18 = icmp eq i16 %16, 295
and xalancbmk has a bunch of examples, such as
_ZN11xercesc_2_5L15gCombiningCharsE and _ZN11xercesc_2_5L10gBaseCharsE.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92417 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.5 KiB
LLVM
60 lines
1.5 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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@G16 = internal constant [10 x i16] [i16 35, i16 82, i16 69, i16 81, i16 85,
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i16 73, i16 82, i16 69, i16 68, i16 0]
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@GD = internal constant [3 x double] [double 1.0, double 4.0, double -20.0]
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define i1 @test1(i32 %X) {
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%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
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%Q = load i16* %P
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%R = icmp eq i16 %Q, 0
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ret i1 %R
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; CHECK: @test1
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; CHECK-NEXT: %R = icmp eq i32 %X, 9
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; CHECK-NEXT: ret i1 %R
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}
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define i1 @test2(i32 %X) {
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%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
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%Q = load i16* %P
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%R = icmp slt i16 %Q, 85
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ret i1 %R
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; CHECK: @test2
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; CHECK-NEXT: %R = icmp ne i32 %X, 4
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; CHECK-NEXT: ret i1 %R
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}
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define i1 @test3(i32 %X) {
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%P = getelementptr [3 x double]* @GD, i32 0, i32 %X
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%Q = load double* %P
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%R = fcmp oeq double %Q, 1.0
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ret i1 %R
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; CHECK: @test3
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; CHECK-NEXT: %R = icmp eq i32 %X, 0
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; CHECK-NEXT: ret i1 %R
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}
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define i1 @test4(i32 %X) {
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%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
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%Q = load i16* %P
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%R = icmp sle i16 %Q, 73
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ret i1 %R
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; CHECK: @test4
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; CHECK-NEXT: lshr i32 933, %X
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; CHECK-NEXT: and i32 {{.*}}, 1
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; CHECK-NEXT: %R = icmp ne i32 {{.*}}, 0
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; CHECK-NEXT: ret i1 %R
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}
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define i1 @test5(i32 %X) {
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%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
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%Q = load i16* %P
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%R = icmp eq i16 %Q, 69
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ret i1 %R
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; CHECK: @test5
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; CHECK-NEXT: icmp eq i32 %X, 2
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; CHECK-NEXT: icmp eq i32 %X, 7
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; CHECK-NEXT: %R = or i1
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; CHECK-NEXT: ret i1 %R
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}
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