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[InstCombine] add tests for memcmp with constant; NFC

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This is the baseline (current) version of the tests that would
have been added with the transform in r311333 (reverted at 
r311340 due to inf-looping).

Adding these now to aid in testing and minimize the patch if/when
it is reinstated.

llvm-svn: 311350
This commit is contained in:
Sanjay Patel 2017-08-21 16:47:12 +00:00
parent f2f667dd6a
commit 6bf02fc19f
1 changed files with 51 additions and 0 deletions
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51
test/Transforms/InstCombine/memcmp-constant-fold.ll Normal file
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; RUN: opt < %s -instcombine -S -data-layout=e-n32 | FileCheck %s --check-prefix=ALL --check-prefix=LE
; RUN: opt < %s -instcombine -S -data-layout=E-n32 | FileCheck %s --check-prefix=ALL --check-prefix=BE
declare i32 @memcmp(i8*, i8*, i64)
; TODO: The alignment of this constant does not matter. We constant fold the load.
@charbuf = private unnamed_addr constant [4 x i8] [i8 0, i8 0, i8 0, i8 1], align 1
define i1 @memcmp_4bytes_unaligned_constant_i8(i8* align 4 %x) {
; ALL-LABEL: @memcmp_4bytes_unaligned_constant_i8(
; ALL-NEXT: [[CALL:%.*]] = tail call i32 @memcmp(i8* %x, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @charbuf, i64 0, i64 0), i64 4)
; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0
; ALL-NEXT: ret i1 [[CMPEQ0]]
;
%call = tail call i32 @memcmp(i8* %x, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @charbuf, i64 0, i64 0), i64 4)
%cmpeq0 = icmp eq i32 %call, 0
ret i1 %cmpeq0
}
; TODO: We still don't care about alignment of the constant. We are not limited to constant folding only i8 arrays.
; It doesn't matter if the constant operand is the first operand to the memcmp.
@intbuf_unaligned = private unnamed_addr constant [4 x i16] [i16 1, i16 2, i16 3, i16 4], align 1
define i1 @memcmp_4bytes_unaligned_constant_i16(i8* align 4 %x) {
; ALL-LABEL: @memcmp_4bytes_unaligned_constant_i16(
; ALL-NEXT: [[CALL:%.*]] = tail call i32 @memcmp(i8* bitcast ([4 x i16]* @intbuf_unaligned to i8*), i8* %x, i64 4)
; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0
; ALL-NEXT: ret i1 [[CMPEQ0]]
;
%call = tail call i32 @memcmp(i8* bitcast (i16* getelementptr inbounds ([4 x i16], [4 x i16]* @intbuf_unaligned, i64 0, i64 0) to i8*), i8* %x, i64 4)
%cmpeq0 = icmp eq i32 %call, 0
ret i1 %cmpeq0
}
; TODO: Any memcmp where all arguments are constants should be constant folded. Currently, we only handle i8 array constants.
@intbuf = private unnamed_addr constant [2 x i32] [i32 0, i32 1], align 4
define i1 @memcmp_3bytes_aligned_constant_i32(i8* align 4 %x) {
; ALL-LABEL: @memcmp_3bytes_aligned_constant_i32(
; ALL-NEXT: [[CALL:%.*]] = tail call i32 @memcmp(i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 1) to i8*), i8* bitcast ([2 x i32]* @intbuf to i8*), i64 3)
; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0
; ALL-NEXT: ret i1 [[CMPEQ0]]
;
%call = tail call i32 @memcmp(i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 1) to i8*), i8* bitcast (i32* getelementptr inbounds ([2 x i32], [2 x i32]* @intbuf, i64 0, i64 0) to i8*), i64 3)
%cmpeq0 = icmp eq i32 %call, 0
ret i1 %cmpeq0
}