derek.holloway
7502bf64a4
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67 lines
1.9 KiB
LLVM
67 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Verify that the special case of memchr calls with the size of 1 are
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; folded as expected.
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declare ptr @memchr(ptr, i32, i64)
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@ax = external global [0 x i8]
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@a12345 = constant [5 x i8] c"\01\02\03\04\05"
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; Fold memchr(a12345, 1, 1) to a12345.
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define ptr @fold_memchr_a12345_1_1() {
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; CHECK-LABEL: @fold_memchr_a12345_1_1(
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; CHECK-NEXT: ret ptr @a12345
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;
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%res = call ptr @memchr(ptr @a12345, i32 1, i64 1)
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ret ptr %res
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}
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; Fold memchr(a12345, 2, 1) to null.
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define ptr @fold_memchr_a12345_2_1() {
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; CHECK-LABEL: @fold_memchr_a12345_2_1(
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; CHECK-NEXT: ret ptr null
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;
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%res = call ptr @memchr(ptr @a12345, i32 2, i64 1)
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ret ptr %res
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}
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; Fold memchr(ax, 257, 1) to (unsigned char)*ax == 1 ? ax : null
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; to verify the constant 257 is converted to unsigned char (yielding 1).
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define ptr @fold_memchr_ax_257_1(i32 %chr, i64 %n) {
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; CHECK-LABEL: @fold_memchr_ax_257_1(
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; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, ptr @ax, align 1
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; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], 1
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; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], ptr @ax, ptr null
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; CHECK-NEXT: ret ptr [[MEMCHR_SEL]]
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;
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%res = call ptr @memchr(ptr @ax, i32 257, i64 1)
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ret ptr %res
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}
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; Fold memchr(ax, c, 1) to (unsigned char)*ax == (unsigned char)c ? ax : null.
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define ptr @fold_memchr_ax_c_1(i32 %chr, i64 %n) {
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; CHECK-LABEL: @fold_memchr_ax_c_1(
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; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, ptr @ax, align 1
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[CHR:%.*]] to i8
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; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], [[TMP1]]
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; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], ptr @ax, ptr null
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; CHECK-NEXT: ret ptr [[MEMCHR_SEL]]
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;
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%res = call ptr @memchr(ptr @ax, i32 %chr, i64 1)
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ret ptr %res
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}
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