| Sanjay Patel | cf081f9 | 2017-08-21 16:47:12 +0000 | [diff] [blame^] | 1 | ; RUN: opt < %s -instcombine -S -data-layout=e-n32 | FileCheck %s --check-prefix=ALL --check-prefix=LE |
| 2 | ; RUN: opt < %s -instcombine -S -data-layout=E-n32 | FileCheck %s --check-prefix=ALL --check-prefix=BE |
| 3 | |
| 4 | declare i32 @memcmp(i8*, i8*, i64) |
| 5 | |
| 6 | ; TODO: The alignment of this constant does not matter. We constant fold the load. |
| 7 | |
| 8 | @charbuf = private unnamed_addr constant [4 x i8] [i8 0, i8 0, i8 0, i8 1], align 1 |
| 9 | |
| 10 | define i1 @memcmp_4bytes_unaligned_constant_i8(i8* align 4 %x) { |
| 11 | ; ALL-LABEL: @memcmp_4bytes_unaligned_constant_i8( |
| 12 | ; 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) |
| 13 | ; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0 |
| 14 | ; ALL-NEXT: ret i1 [[CMPEQ0]] |
| 15 | ; |
| 16 | %call = tail call i32 @memcmp(i8* %x, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @charbuf, i64 0, i64 0), i64 4) |
| 17 | %cmpeq0 = icmp eq i32 %call, 0 |
| 18 | ret i1 %cmpeq0 |
| 19 | } |
| 20 | |
| 21 | ; TODO: We still don't care about alignment of the constant. We are not limited to constant folding only i8 arrays. |
| 22 | ; It doesn't matter if the constant operand is the first operand to the memcmp. |
| 23 | |
| 24 | @intbuf_unaligned = private unnamed_addr constant [4 x i16] [i16 1, i16 2, i16 3, i16 4], align 1 |
| 25 | |
| 26 | define i1 @memcmp_4bytes_unaligned_constant_i16(i8* align 4 %x) { |
| 27 | ; ALL-LABEL: @memcmp_4bytes_unaligned_constant_i16( |
| 28 | ; ALL-NEXT: [[CALL:%.*]] = tail call i32 @memcmp(i8* bitcast ([4 x i16]* @intbuf_unaligned to i8*), i8* %x, i64 4) |
| 29 | ; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0 |
| 30 | ; ALL-NEXT: ret i1 [[CMPEQ0]] |
| 31 | ; |
| 32 | %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) |
| 33 | %cmpeq0 = icmp eq i32 %call, 0 |
| 34 | ret i1 %cmpeq0 |
| 35 | } |
| 36 | |
| 37 | ; TODO: Any memcmp where all arguments are constants should be constant folded. Currently, we only handle i8 array constants. |
| 38 | |
| 39 | @intbuf = private unnamed_addr constant [2 x i32] [i32 0, i32 1], align 4 |
| 40 | |
| 41 | define i1 @memcmp_3bytes_aligned_constant_i32(i8* align 4 %x) { |
| 42 | ; ALL-LABEL: @memcmp_3bytes_aligned_constant_i32( |
| 43 | ; 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) |
| 44 | ; ALL-NEXT: [[CMPEQ0:%.*]] = icmp eq i32 [[CALL]], 0 |
| 45 | ; ALL-NEXT: ret i1 [[CMPEQ0]] |
| 46 | ; |
| 47 | %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) |
| 48 | %cmpeq0 = icmp eq i32 %call, 0 |
| 49 | ret i1 %cmpeq0 |
| 50 | } |
| 51 | |