derek.holloway
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70 lines
2.6 KiB
LLVM
70 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -O3 -S < %s | FileCheck %s
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;; This tests lowering of the implementations of table-based ctz
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;; algorithm to the llvm.cttz instruction in the -O3 case.
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;; C producer:
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;; int ctz1 (unsigned x)
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;; {
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;; static const char table[32] =
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;; {
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;; 0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
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;; 31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
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;; };
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;; return table[((unsigned)((x & -x) * 0x077CB531U)) >> 27];
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;; }
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;; Compiled as: clang -O3 test.c -S -emit-llvm -Xclang -disable-llvm-optzns
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@ctz1.table = internal constant [32 x i8] c"\00\01\1C\02\1D\0E\18\03\1E\16\14\0F\19\11\04\08\1F\1B\0D\17\15\13\10\07\1A\0C\12\06\0B\05\0A\09", align 16
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define i32 @ctz(i32 noundef %x) {
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; CHECK-LABEL: define range(i32 0, 32) i32 @ctz(
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; CHECK-SAME: i32 noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[TMP0:%.*]] = tail call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[X]], i1 true)
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: [[CONV:%.*]] = select i1 [[TMP1]], i32 0, i32 [[TMP0]]
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; CHECK-NEXT: ret i32 [[CONV]]
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;
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, ptr %x.addr, align 4
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%0 = load i32, ptr %x.addr, align 4
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%1 = load i32, ptr %x.addr, align 4
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%sub = sub i32 0, %1
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%and = and i32 %0, %sub
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%mul = mul i32 %and, 125613361
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%shr = lshr i32 %mul, 27
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%idxprom = zext i32 %shr to i64
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%arrayidx = getelementptr inbounds [32 x i8], ptr @ctz1.table, i64 0, i64 %idxprom
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%2 = load i8, ptr %arrayidx, align 1
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%conv = sext i8 %2 to i32
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ret i32 %conv
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}
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define i32 @ctz_nonarraygep(i32 noundef %x) {
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; CHECK-LABEL: define range(i32 0, 32) i32 @ctz_nonarraygep(
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; CHECK-SAME: i32 noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[TMP0:%.*]] = tail call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[X]], i1 true)
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: [[CONV:%.*]] = select i1 [[TMP1]], i32 0, i32 [[TMP0]]
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; CHECK-NEXT: ret i32 [[CONV]]
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;
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, ptr %x.addr, align 4
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%0 = load i32, ptr %x.addr, align 4
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%1 = load i32, ptr %x.addr, align 4
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%sub = sub i32 0, %1
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%and = and i32 %0, %sub
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%mul = mul i32 %and, 125613361
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%shr = lshr i32 %mul, 27
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%idxprom = zext i32 %shr to i64
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%arrayidx = getelementptr inbounds i8, ptr @ctz1.table, i64 %idxprom
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%2 = load i8, ptr %arrayidx, align 1
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%conv = sext i8 %2 to i32
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ret i32 %conv
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}
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